CN100472976C - Low and intermediate frequency wireless receiver with calibrating circuit - Google Patents
Low and intermediate frequency wireless receiver with calibrating circuit Download PDFInfo
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- CN100472976C CN100472976C CNB2005100231717A CN200510023171A CN100472976C CN 100472976 C CN100472976 C CN 100472976C CN B2005100231717 A CNB2005100231717 A CN B2005100231717A CN 200510023171 A CN200510023171 A CN 200510023171A CN 100472976 C CN100472976 C CN 100472976C
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Abstract
The invention discloses a low-intermediate frequency wireless receiver with calibration circuit, which comprises: a high-speed frequency divider with an added differential offset current tunable array to change local oscillator duty ratio by fine tuning offset current and realize coarse tuning for image frequency interference phase, and a frequency mixer with a resistive load tunable array to eliminate amplitude mismatch as image frequency interference and a switch capacity load tunable array to realize fine tuning for image frequency interference phase. This invention improves the mismatch from asymmetry and technology error and suppression function to interference.
Description
Technical field
The present invention relates to a kind of wireless telecommunications receiving equipment, particularly a kind of Low Medium Frequency wireless receiver.
Background technology
Along with the progress of technological level and the raising that level of integrated system is required, more and more to the research and the design of low intermediate frequency receiver (Fig. 1).Low intermediate frequency receiver transforms to Low Medium Frequency with radiofrequency signal, transform to base band again, not only overcome zero intermediate frequency reciver direct current interference problem, and Low Medium Frequency is to the quality factor requirement reduction of filter, filter can be realized in the sheet, overcome the low shortcoming of traditional receiver integrated level again.
The greatest drawback of low intermediate frequency receiver is that image frequency disturbs inhibition low.Image frequency disturb with radiofrequency signal on frequency spectrum, be symmetrical centre with the local frequency, differ the IF-FRE (Fig. 2) of twice.Superheterodyne receiver adopts high intermediate frequency, image frequency is disturbed and radiofrequency signal is separated by on frequency spectrum hundreds of million usually, the outer radio frequency selective filter (RF Filter) of sheet can effectively suppress image frequency to be disturbed, thereby has reduced the requirement to the outer image frequency filter (IR Filter) of sheet.And the image frequency of low intermediate frequency receiver is disturbed and radiofrequency signal has only several million or tens000000 on frequency spectrum, and the outer radio frequency selective filter of sheet can't suppress image frequency to be disturbed.Meanwhile the image frequency codan in the sheet is very sensitive again to the mismatch of phase place and amplitude, and the small mismatch of phase place and amplitude will the severe exacerbation image frequency be disturbed inhibition, suppresses to satisfy system requirements thereby image frequency is disturbed.
Fig. 5 is a kind of typical Low Medium Frequency wireless receiver front end block diagram.Voltage-controlled oscillator (VCO) output frequency is 2f
LOLocal oscillator, producing frequency through two-divider (DIV2) is f
LOOrthogonal local oscillation.Orthogonal mixer (Mixer) produces quadrature Low Medium Frequency signal with two-divider orthogonal local oscillation signal that produces and the radiofrequency signal mixing of amplifying through low noise amplifier (LNA).Radiofrequency signal and image frequency interference signal can fall into same frequency band through behind the orthogonal mixer, but quadrature phase is respectively 90 degree and 270 degree.Through image frequency noise killer (IR Filter), orthogonal signalling are applied, and orthogonal interference is cancelled.But the error of the asymmetric and technology of circuit, domain all can cause the orthogonal interference amplitude of frequency mixer output and the mismatch of phase place, thereby makes the image frequency interference signal have no idea to offset fully.
Therefore, adopt low intermediate frequency receiver, must utilize the calibration circuit adjusting to cause that the image frequency interference suppresses the phase place of deterioration and the mismatch of amplitude, improves image frequency effectively and disturbs inhibition, thereby satisfy system requirements.
Summary of the invention
The invention provides a kind of Low Medium Frequency wireless receiver with calibration circuit, its thick, fine tuning by phase place and amplitude adjusted have effectively been improved by circuit, domain is asymmetric and fabrication error causes phase place and the mismatch of amplitude, have improved image frequency and have disturbed and suppress.
As shown in Figure 3, the output of the voltage-controlled oscillator of this Low Medium Frequency wireless receiver (VCO) links to each other with the clock injection end of high-speed frequency divider (DIV2); This high-speed frequency divider one output links to each other with an input of first frequency mixer, and another output of high-speed frequency divider links to each other with an input of second frequency mixer; Radiofrequency signal input low noise amplifier (LNA); The output of this low noise amplifier links to each other with another input of first frequency mixer, second frequency mixer (Mixer) respectively; The output of first, second frequency mixer links to each other with the input of image frequency noise killer (IR Filter) respectively; Image frequency noise killer output orthogonal Low Medium Frequency signal.
The Low Medium Frequency wireless receiver of band calibration circuit of the present invention is the some groups of circuit that are in series by bias current and control switch in parallel in the high-speed frequency divider biasing circuit.By control switch fine setting Q
1, Q
2Bias voltage, change the duty ratio of two divided-frequency output orthogonal local oscillator, thereby change the quadrature phase that orthogonal mixer output image frequency is disturbed, realize the phase place coarse adjustment.At traditional Ji Bote mixer load output stage some groups of circuit that are in series by load resistance and control switch in parallel.Regulate the frequency mixer output load resistance by control switch, change the quadrature amplitude that orthogonal mixer output image frequency is disturbed, realize amplitude adjusted.At traditional Ji Bote mixer load output stage some groups of circuit that are in series by load capacitance and control switch in parallel.Image frequency by the output of control switch fine setting orthogonal mixer is disturbed quadrature phase.
Thick, fine tuning and the amplitude adjusted of the Low Medium Frequency wireless receiver of band calibration circuit of the present invention by phase place effectively improved by circuit, domain is asymmetric and fabrication error causes phase place and the mismatch of amplitude, improved image frequency and disturbed and suppress.
Description of drawings
Fig. 1 is a Low Medium Frequency structural morphism frequency receiver block diagram;
Fig. 2 be image frequency disturb and radiofrequency signal on frequency spectrum with respect to the block diagram that concerns of local frequency;
Fig. 3 is a Low Medium Frequency wireless receiver front end block diagram;
Fig. 4 is traditional high-speed frequency divider block diagram;
Fig. 5 is the two-divider block diagram that the present invention increases phase place coarse adjustment array;
Fig. 6 is traditional Gilbert frequency mixer block diagram;
Fig. 7 is the frequency mixer block diagram that the present invention increases phase place fine tuning and amplitude adjusted array.
Embodiment
Below in conjunction with accompanying drawing the specific embodiment of the present invention is described in further detail.
As shown in Figure 3, in the present invention, the output of voltage-controlled oscillator links to each other with the clock injection end of high-speed frequency divider.As shown in Figure 4, traditional high speed two-divider injects level (Q by clock
1-Q
2), oscillate in quadrature level (Q
3-Q
6), load stage (R
3-R
6) and the biasing circuit formation.As shown in Figure 5, the Low Medium Frequency wireless receiver of band calibration circuit of the present invention, wherein high-speed frequency divider has increased by two groups of bias current adjustable arraies on traditional high-speed frequency divider, lays respectively at clock injector (Q
1, Q
2) base stage and direct voltage source between, two bias current adjustable arraies are composed in parallel by the current source of the individual belt switch of n (n 〉=1) respectively, by control switch fine setting Q
1, Q
2Bias voltage, change the duty ratio of two divided-frequency output orthogonal local oscillator, thereby change quadrature phase that orthogonal mixer output image frequency disturbs, realize phase adjusted.In the present invention, high-speed frequency divider one output links to each other with an input of first frequency mixer, and another output of high-speed frequency divider links to each other with an input of second frequency mixer; Radiofrequency signal input low noise amplifier; The output of this low noise amplifier links to each other with another input of first frequency mixer, second frequency mixer respectively; The output of first, second frequency mixer links to each other with the input of this image frequency noise killer respectively; The output orthogonal Low Medium Frequency signal of this image frequency noise killer.
As shown in Figure 3, in the present invention, the output of voltage-controlled oscillator links to each other with the clock injection end of high-speed frequency divider; High-speed frequency divider one output links to each other with an input of first frequency mixer, and another output of high-speed frequency divider links to each other with an input of second frequency mixer.As shown in Figure 6, traditional Ji Bote frequency mixer is by radio-frequency driven level (Q
7-Q
8), local oscillator switching stage (Q
9-Q
12), load output stage (R
1-R
2) and the biasing circuit formation.The frequency mixer of the Low Medium Frequency wireless receiver of band calibration circuit of the present invention has increased by two groups of quadrature phase regulating circuits on the basis of traditional Ji Bote frequency mixer, two groups of quadrature phase regulating circuits are composed in parallel by the load capacitance of the individual belt switch of m (m 〉=1) respectively, one end of two groups of quadrature phase regulating circuits links to each other with two load outputs of frequency mixer respectively, other end ground connection, this capacitive load adjustable array disturbs quadrature phase by the image frequency of control switch fine setting orthogonal mixer output.In the present invention, radiofrequency signal input low noise amplifier; The output of this low noise amplifier links to each other with another input of first frequency mixer, second frequency mixer respectively; The output of first, second frequency mixer links to each other with the input of image frequency noise killer respectively; The output orthogonal Low Medium Frequency signal of this image frequency noise killer.
As shown in Figure 3, in the present invention, the output of voltage-controlled oscillator links to each other with the clock injection end of high-speed frequency divider; High-speed frequency divider one output links to each other with an input of first frequency mixer, and another output of high-speed frequency divider links to each other with an input of second frequency mixer.As shown in Figure 6, traditional Ji Bote frequency mixer is by radio-frequency driven level (Q
7-Q
8), local oscillator switching stage (Q
9-Q
12), load output stage (R
1-R
2) and the biasing circuit formation.The frequency mixer of the Low Medium Frequency wireless receiver of band calibration circuit of the present invention has increased by two groups of quadrature amplitude regulating circuits on the basis of traditional Ji Bote frequency mixer, two groups of quadrature amplitude regulating circuits are composed in parallel by the load resistance of the individual belt switch of p (p 〉=1) respectively, and respectively with two load output load (R of frequency mixer
1, R
2) parallel connection, this ohmic load adjustable array is regulated the frequency mixer output load resistance by control switch, changes the quadrature amplitude that orthogonal mixer output image frequency is disturbed, and realizes amplitude adjusted.In the present invention, radiofrequency signal input low noise amplifier; The output of this low noise amplifier links to each other with another input of first frequency mixer, second frequency mixer respectively; The output of first, second frequency mixer links to each other with the input of image frequency noise killer respectively; The output orthogonal Low Medium Frequency signal of this image frequency noise killer.
The Low Medium Frequency wireless receiver of one of preferred embodiment of the present invention band calibration circuit is for simultaneously with the Low Medium Frequency wireless receiver of phase place coarse adjustment, phase place fine tuning, amplitude regulating circuit:
As shown in Figure 3, in the present invention, the output of voltage-controlled oscillator links to each other with the clock injection end of high-speed frequency divider.As shown in Figure 4, traditional high speed two-divider injects level (Q by clock
1-Q
2), oscillate in quadrature level (Q
3-Q
6), load stage (R
3-R
6) and the biasing circuit formation.As shown in Figure 5, the Low Medium Frequency wireless receiver of band calibration circuit of the present invention, wherein high-speed frequency divider has increased by two groups of bias current adjustable arraies on traditional high-speed frequency divider, lays respectively at clock injector (Q
1, Q
2) base stage and direct voltage source between, two bias current adjustable arraies are composed in parallel by the current source of the individual belt switch of n (n 〉=1) respectively, by control switch fine setting Q
1, Q
2Bias voltage, change the duty ratio of two divided-frequency output orthogonal local oscillator, thereby change the quadrature phase that orthogonal mixer output image frequency is disturbed, realize the phase place coarse adjustment.In the present invention, high-speed frequency divider one output links to each other with an input of first frequency mixer, and another output of high-speed frequency divider links to each other with an input of second frequency mixer.As shown in Figure 6, traditional Ji Bote frequency mixer is by radio-frequency driven level (Q
7-Q
8), local oscillator switching stage (Q
9-Q
12), load output stage (R
1-R
2) and the biasing circuit formation.As shown in Figure 7, the Low Medium Frequency wireless receiver of band calibration circuit of the present invention, wherein frequency mixer has increased by two groups of quadrature amplitude regulating circuits and two groups of quadrature phase regulating circuits on the basis of traditional Ji Bote frequency mixer, two groups of quadrature amplitude regulating circuits are composed in parallel by the load resistance of the individual belt switch of p (p 〉=1) respectively, and respectively with two load output load (R of frequency mixer
1, R
2) parallel connection, two groups of quadrature phase regulating circuits are composed in parallel by the load capacitance of the individual belt switch of m (m 〉=1) respectively, one end of two groups of quadrature phase regulating circuits links to each other with two load outputs of frequency mixer respectively, other end ground connection, this ohmic load adjustable array is regulated the frequency mixer output load resistance by control switch, change the quadrature amplitude that orthogonal mixer output image frequency is disturbed, realize amplitude adjusted, this capacitive load adjustable array disturbs quadrature phase by the image frequency of control switch fine setting orthogonal mixer output.In the present invention, radiofrequency signal input low noise amplifier; The output of this low noise amplifier links to each other with another input of first frequency mixer, second frequency mixer respectively; The output of first, second frequency mixer links to each other with the input of image frequency noise killer respectively; The output orthogonal Low Medium Frequency signal of this image frequency noise killer.
The Low Medium Frequency wireless receiver of band calibration circuit of the present invention, wherein phase place coarse adjustment, fine tuning and amplitude are transferred Joint is independent of each other, and the present invention has circuit structure and simply, do not increase the extra characteristics such as current power dissipation, Its coarse adjustment by the image interference phase place, fine tuning and amplitude adjusted have effectively been improved by circuit, domain not The phase place that symmetry and fabrication error cause and the mismatch of amplitude have improved the image interference inhibition.
Claims (14)
1, a kind of Low Medium Frequency wireless receiver with calibration circuit, it is characterized in that: described Low Medium Frequency wireless receiver comprises:
Low noise amplifier;
Voltage-controlled oscillator;
High-speed frequency divider with clock injection end, two outputs and quadrature phase regulating circuit;
First frequency mixer, second frequency mixer with two inputs and an output; With
The image frequency noise killer;
The output of described voltage-controlled oscillator links to each other with the clock injection end of described high-speed frequency divider; Described high-speed frequency divider one output links to each other with an input of described first frequency mixer, and another output of described high-speed frequency divider links to each other with an input of described second frequency mixer; Radiofrequency signal is imported described low noise amplifier; The output of described low noise amplifier links to each other with another input of described first frequency mixer, described second frequency mixer respectively; The output of described first, second frequency mixer links to each other with the input of described image frequency noise killer respectively; Described image frequency noise killer output orthogonal Low Medium Frequency signal.
2, the Low Medium Frequency wireless receiver of band calibration circuit according to claim 1 is characterized in that: described clock injection end comprises positive phase clock injector (Q
1) and inversion clock injector (Q
2), described quadrature phase regulating circuit is two groups of difference bias current adjustable arraies.
3, the Low Medium Frequency wireless receiver of band calibration circuit according to claim 2 is characterized in that: described two groups of difference bias current adjustable arraies lay respectively at positive phase clock injector (Q
1) and inversion clock injector (Q
2) and direct voltage source between.
4, the Low Medium Frequency wireless receiver of band calibration circuit according to claim 3 is characterized in that: described bias current adjustable array is made up of the current source of at least one belt switch, and current source surpasses one and then is arranged in parallel.
5, a kind of Low Medium Frequency wireless receiver with calibration circuit, it is characterized in that: described Low Medium Frequency wireless receiver comprises:
Low noise amplifier;
Voltage-controlled oscillator;
High-speed frequency divider with clock injection end and two outputs;
First frequency mixer, second frequency mixer with two inputs, an output and quadrature amplitude regulating circuit; With
The image frequency noise killer;
The output of described voltage-controlled oscillator links to each other with the clock injection end of described high-speed frequency divider; Described high-speed frequency divider one output links to each other with an input of described first frequency mixer, and another output of described high-speed frequency divider links to each other with an input of described second frequency mixer; Radiofrequency signal is imported described low noise amplifier; The output of described low noise amplifier links to each other with another input of described first frequency mixer, described second frequency mixer respectively; The output of described first, second frequency mixer links to each other with the input of described image frequency noise killer respectively; Described image frequency noise killer output orthogonal Low Medium Frequency signal.
6, the Low Medium Frequency wireless receiver of band calibration circuit according to claim 5 is characterized in that: described first, second frequency mixer is the Ji Bote frequency mixer.
7, the Low Medium Frequency wireless receiver of band calibration circuit according to claim 6 is characterized in that: described quadrature amplitude regulating circuit is two groups of ohmic load adjustable arraies.
8, the Low Medium Frequency wireless receiver of band calibration circuit according to claim 7 is characterized in that: described two groups of ohmic load adjustable arraies respectively with two load output load (R of described frequency mixer
1, R
2) parallel connection.
9, the Low Medium Frequency wireless receiver of band calibration circuit according to claim 8 is characterized in that: described ohmic load adjustable array is made up of the load resistance of at least one belt switch, and load resistance surpasses one and then is arranged in parallel.
10, a kind of Low Medium Frequency wireless receiver with calibration circuit, it is characterized in that: described Low Medium Frequency wireless receiver comprises:
Low noise amplifier;
Voltage-controlled oscillator;
High-speed frequency divider with clock injection end and two outputs;
First frequency mixer, second frequency mixer with two inputs, an output and quadrature phase regulating circuit; With
The image frequency noise killer;
The output of described voltage-controlled oscillator links to each other with the clock injection end of described high-speed frequency divider; Described high-speed frequency divider one output links to each other with an input of described first frequency mixer, and another output of described high-speed frequency divider links to each other with an input of described second frequency mixer; Radiofrequency signal is imported described low noise amplifier; The output of described low noise amplifier links to each other with another input of described first frequency mixer, described second frequency mixer respectively; The output of described first, second frequency mixer links to each other with the input of described image frequency noise killer respectively; Described image frequency noise killer output orthogonal Low Medium Frequency signal.
11, the Low Medium Frequency wireless receiver of band calibration circuit according to claim 10 is characterized in that: described first, second frequency mixer is the Ji Bote frequency mixer.
12, the Low Medium Frequency wireless receiver of band calibration circuit according to claim 11 is characterized in that: described quadrature phase regulating circuit is two groups of capacitive load adjustable arraies.
13, the Low Medium Frequency wireless receiver of band calibration circuit according to claim 12 is characterized in that: described two groups of capacitive load adjustable arraies, one end ground connection, the other end link to each other with two load outputs of described frequency mixer respectively.
14, the Low Medium Frequency wireless receiver of band calibration circuit according to claim 13 is characterized in that: described capacitive load adjustable array is made up of the load capacitance of at least one belt switch, and load capacitance surpasses one and then is arranged in parallel.
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|---|---|---|---|
| CNB2005100231717A CN100472976C (en) | 2005-01-07 | 2005-01-07 | Low and intermediate frequency wireless receiver with calibrating circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100231717A CN100472976C (en) | 2005-01-07 | 2005-01-07 | Low and intermediate frequency wireless receiver with calibrating circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1801634A CN1801634A (en) | 2006-07-12 |
| CN100472976C true CN100472976C (en) | 2009-03-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100231717A Expired - Fee Related CN100472976C (en) | 2005-01-07 | 2005-01-07 | Low and intermediate frequency wireless receiver with calibrating circuit |
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Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8259876B2 (en) * | 2008-03-21 | 2012-09-04 | Skyworks Solutions, Inc. | System and method for tuning a radio receiver |
| US20110068765A1 (en) * | 2009-09-22 | 2011-03-24 | Qualcomm Incorporated | System and method for power calibrating a pulse generator |
| CN101783680B (en) * | 2009-12-30 | 2012-06-27 | 上海迦美信芯通讯技术有限公司 | Frequency synthesizer and calibration method thereof |
| US8963735B2 (en) * | 2011-11-30 | 2015-02-24 | Rosemount Inc. | Turbine meter pre-scaling terminal block electronics |
| CN103762945A (en) * | 2014-01-20 | 2014-04-30 | 复旦大学 | Accurate quadrature voltage-controlled oscillator circuit with phase adjustable |
| CN104320204B (en) * | 2014-11-11 | 2017-02-15 | 中国电子科技集团公司第五十四研究所 | Local oscillator IQ signal phase and amplitude calibration device |
| US10034258B2 (en) * | 2016-06-29 | 2018-07-24 | Infineon Technologies Ag | Signal detector device and method |
| US10694405B2 (en) * | 2016-11-03 | 2020-06-23 | Futurewei Technologies, Inc. | Apparatus and method for setting a local oscillator duty ratio based on an image distortion level |
| CN111490801A (en) * | 2019-01-29 | 2020-08-04 | 上海川土微电子有限公司 | Radio frequency receiver architecture with adjustable image rejection ratio |
| CN109981509A (en) * | 2019-03-18 | 2019-07-05 | 深圳市鼎阳科技有限公司 | A kind of method and apparatus that amplitude and phase are adjusted |
| CN112383863B (en) * | 2020-11-08 | 2022-07-05 | 西安瑞祥深海科技有限公司 | Multichannel sonobuoy signal preprocessing system and method |
| CN118923046A (en) * | 2022-03-31 | 2024-11-08 | 华为技术有限公司 | Receiver, communication equipment and signal processing method |
-
2005
- 2005-01-07 CN CNB2005100231717A patent/CN100472976C/en not_active Expired - Fee Related
Non-Patent Citations (2)
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|---|
| 复数混频的低中频复采样数字接收机. 林华杰，史浩山.西北工业大学学报，第21卷第5期. 2003 |
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| CN1801634A (en) | 2006-07-12 |
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