CN115811283A - Anti-wifi signal interference circuit of trans-impedance amplifier - Google Patents
Anti-wifi signal interference circuit of trans-impedance amplifier Download PDFInfo
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- CN115811283A CN115811283A CN202211488970.1A CN202211488970A CN115811283A CN 115811283 A CN115811283 A CN 115811283A CN 202211488970 A CN202211488970 A CN 202211488970A CN 115811283 A CN115811283 A CN 115811283A
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Abstract
The invention discloses a wifi signal interference resisting circuit of a transimpedance amplifier, which comprises an LC low-pass filtering module arranged in the transimpedance amplifier, wherein a second output end of an RSSI functional module of the transimpedance amplifier is connected with an RSSI pin of a light receiving component through the LC low-pass filtering module. The invention can improve the anti-wifi signal interference capability of the trans-impedance amplifier, so that the light receiving component does not need to be provided with an off-chip decoupling capacitor, and the cost of the light receiving component is reduced and the production efficiency of the light receiving component is improved.
Description
Technical Field
The invention relates to the field of optical communication, in particular to a wifi signal interference resisting circuit of a trans-impedance amplifier.
Background
In modern FTTH fiber-to-the-home applications, a light emitting and receiving component (BOSA) is usually integrated ON the main BOARD of the Optical modem together with a chip such as LA/DRIVER/MAC, which is commonly called BOB (BOSA ON BOARD). Meanwhile, most optical cats have wifi functions, and the volume of the optical cat equipment is generally expected to be as small as possible, so that the distance between the wifi antenna and the light emitting and receiving component is generally very close; in addition, in many user homes, the optical modem and the wifi router which is additionally installed are also used to be placed next to each other; therefore, the optical transmitting and receiving assembly is easily interfered by wifi signals in practical application.
Specifically, the optical transceiver module is a bidirectional optical communication module, which mainly comprises an optical Transmitter Optical Subassembly (TOSA), an optical Receiver Optical Subassembly (ROSA) and other optical components, and realizes bidirectional conversion of an optical signal. The optical receiving component processes a weak high-speed optical pulse signal, and for example, in 1.25Gbps GPON application, the receiving sensitivity of the optical receiving component needs to be less than-30 dBm (corresponding to about 1uA of photocurrent), so that the optical receiving component is very easily interfered by wifi signals to seriously degrade a receiving sensitivity index.
As shown in fig. 1, the conventional optical receiving module is packaged by a Photodiode (PD), a Trans-Impedance Amplifier (TIA), and a passive resistance-capacitance Amplifier through wire bonding, and has a VCC pin, a GND pin, an OUTP pin, an OUTN pin, and an RSSI pin, and it is verified through theoretical analysis/experiment that external wifi signals are mainly coupled through the VCC pin and the RSSI pin, so that wifi signals are filtered out by adding a large off-chip decoupling capacitor to the VCC pin and the RSSI pin inside the optical receiving module. Because the fundamental frequency of the Wifi signal is mainly two frequency points of 2.4GHz and 5.8GHz, the high-frequency interference signal is filtered, the off-chip decoupling capacitor is required to have a better Q value and a higher resonant frequency, and meanwhile, the size of the off-chip decoupling capacitor is also required to be packaged in the light receiving component with a smaller volume, and the off-chip decoupling capacitor generally adopts a single-layer capacitor (SLC), so that the cost is higher, the packaging process and routing are increased, the production efficiency is reduced, and the comprehensive cost is higher; therefore, it is necessary to research an anti-WiFi signal interference circuit of a transimpedance amplifier to improve the anti-WiFi signal interference capability of the transimpedance amplifier, so that the optical receiving component does not need to set an off-chip decoupling capacitor for the RSSI pin, thereby reducing the cost and improving the production efficiency.
Disclosure of Invention
The invention aims to provide a wifi signal interference resisting circuit of a transimpedance amplifier, which can effectively improve the wifi signal interference resisting capability of the transimpedance amplifier.
In order to achieve the above purpose, the solution of the invention is:
a wifi signal interference resisting circuit of a transimpedance amplifier is provided, wherein an RSSI functional module is arranged in the transimpedance amplifier, the RSSI functional module is provided with a first output end and a second output end, the first output end of the RSSI functional module is used for being connected with a photodiode of a light receiving component, and the second output end of the RSSI functional module is used for being connected with an RSSI pin of the light receiving component; the anti-wifi signal interference circuit of the transimpedance amplifier comprises an LC low-pass filtering module arranged in the transimpedance amplifier, and a second output end of an RSSI functional module is connected with an RSSI pin through the LC low-pass filtering module.
The LC low-pass filtering module comprises an inductor L1 and a capacitor C1, the first end of the inductor L1 is connected with the RSSI pin, the second end of the inductor L1 is connected with the first end of the capacitor C1 and the second output end of the RSSI functional module, and the second end of the capacitor C1 is connected to the GND pin of the transimpedance amplifier.
An ESD protection circuit is arranged in the transimpedance amplifier and comprises an ESD diode D1 and an ESD diode D2; the cathode of the ESD diode D1 is connected with a VCC pin of the transimpedance amplifier, the anode of the ESD diode D1 and the cathode of the ESD diode D2 are connected with the second output end of the RSSI functional module, and the anode of the ESD diode D2 is connected with a GND pin of the transimpedance amplifier.
After the scheme is adopted, the LC low-pass filtering module is arranged in the transimpedance amplifier, and the second output end of the RSSI functional module of the transimpedance amplifier is connected with the RSSI pin through the LC low-pass filtering module; and from the transmission direction of RSSI base pin to the second output end of RSSI functional module, LC low pass filter module has low pass characteristic, like this when outside wifi signal coupling to the RSSI base pin, the interference effect that high frequency wifi signal can attenuate greatly and reduce the wifi signal through LC low pass filter module to improved the anti wifi signal interference ability of transimpedance amplifier, make the light receiving subassembly need not set up the off-chip decoupling capacitor, help reducing the cost of light receiving subassembly and improve the production efficiency of light receiving subassembly.
Drawings
Fig. 1 is a schematic view of a package structure of a conventional light receiving device;
FIG. 2 is a schematic diagram of the circuit of the present invention;
fig. 3 is a diagram of S21 simulation parameters of the first light emitting element, the second light emitting element, and the third light emitting element.
Detailed Description
In order to further explain the technical scheme of the invention, the invention is explained in detail by the specific embodiment.
As shown in fig. 2, the present invention discloses an anti-wifi signal interference circuit of a transimpedance amplifier, wherein the transimpedance amplifier is internally provided with an RSSI function module and a core transimpedance amplification module, the RSSI function module has a first output end and a second output end, the first output end of the RSSI function module is used for connecting a photodiode of a light receiving component to provide a reverse bias for the photodiode, the second output end of the RSSI function module is used for connecting an RSSI pin of the light receiving component, a power supply end of the RSSI function module is used for connecting a VCC pin of the light receiving component, the RSSI function module is internally provided with a current mirror, and the RSSI function module can mirror a mirror current path which is the same as a photocurrent generated by the photodiode and output the mirror current path to the RSSI pin.
In the invention, the anti-wifi signal interference circuit of the transimpedance amplifier comprises an LC low-pass filtering module which is arranged in the transimpedance amplifier, and a second output end of an RSSI functional module is connected with an RSSI pin through the LC low-pass filtering module; the LC low-pass filtering module has a low-pass characteristic in the transmission direction from the RSSI pin to the second output end of the RSSI functional module, so that when an external wifi signal is coupled to the RSSI pin, the high-frequency wifi signal can be greatly attenuated through the LC low-pass filtering module to reduce the interference effect of the wifi signal, and the wifi signal interference resistance of the transimpedance amplifier is improved. FIG. 3 is a diagram of S21 simulation parameters of a first light emitting module, a second light emitting module and a third light emitting module, wherein the first light emitting module adopts an anti-wifi signal interference circuit of a transimpedance amplifier to reduce the interference effect of a wifi signal, the second light emitting module adopts an off-chip decoupling capacitor to reduce the interference effect of the wifi signal, and the third light emitting module does not adopt the anti-wifi signal interference circuit of the transimpedance amplifier and the external decoupling capacitor to reduce the interference effect of the wifi signal; through simulation tests, compared with the first light emitting component and the third light emitting component, the first light emitting component can improve 20db at 2.4GHz and 5.8GHz, and the interference effect of wifi signals is effectively reduced; compared with the first light emitting component and the second light emitting component, the first light emitting component has the effect at the position of 5.8GHz close to that of the second light emitting component; according to the simulation result, the first light emitting component can meet the practical application requirement.
As shown in fig. 2, in the present invention, the LC low-pass filtering module includes an inductor L1 and a capacitor C1; the first end of the inductor L1 is connected with the RSSI pin, the second end of the inductor L1 is connected with the first end of the capacitor C1 and the second output end of the RSSI functional module, and the second end of the capacitor C1 is connected to the GND pin of the transimpedance amplifier. The LC low-pass filter module has a low-pass characteristic when viewed from the transmission direction from the RSSI pin to the second output end of the RSSI functional module; and the current output outwards by the second output end of the RSSI functional module is direct current and is not influenced by the LC low-pass filtering module.
In the present invention, as shown in fig. 2, an ESD protection circuit is built in the transimpedance amplifier to protect the RSSI function module, and the ESD protection circuit includes an ESD diode D1 and an ESD diode D2; the cathode of the ESD diode D1 is connected with a VCC pin of the transimpedance amplifier, the anode of the ESD diode D1 and the cathode of the ESD diode D2 are connected with the second output end of the RSSI functional module, and the anode of the ESD diode D2 is connected with a GND pin of the transimpedance amplifier. And the LC low-pass filtering module can greatly attenuate a wifi signal coupled to the RSSI pin, so that the wifi signal is prevented from being respectively coupled to a VCC pin and a GND pin of the transimpedance amplifier from the ESD diode D1 and the ESD diode D2 to influence the transmission and amplification of the normal signal by the transimpedance amplifier.
The above embodiments and drawings are not intended to limit the form and style of the present invention, and any suitable changes or modifications thereof by those skilled in the art should be considered as not departing from the scope of the present invention.
Claims (3)
1. The utility model provides an anti wifi signal interference circuit of transimpedance amplifier, this transimpedance amplifier embeds there is the RSSI functional module, and the RSSI functional module has first output and second output, and the first output of RSSI functional module is used for connecting the photodiode of light receiving component, and the second output of RSSI functional module is used for connecting the RSSI pin of light receiving component, its characterized in that: the anti-wifi signal interference circuit of the transimpedance amplifier comprises an LC low-pass filtering module arranged in the transimpedance amplifier, and a second output end of an RSSI functional module is connected with an RSSI pin through the LC low-pass filtering module.
2. The wifi signal interference resisting circuit of trans-impedance amplifier as claimed in claim 1, wherein: the LC low-pass filtering module comprises an inductor L1 and a capacitor C1, the first end of the inductor L1 is connected with the RSSI pin, the second end of the inductor L1 is connected with the first end of the capacitor C1 and the second output end of the RSSI functional module, and the second end of the capacitor C1 is connected to the GND pin of the transimpedance amplifier.
3. The anti-wifi signal interference circuit of the trans-impedance amplifier as claimed in claim 1 or 2, wherein: an ESD protection circuit is arranged in the trans-impedance amplifier and comprises an ESD diode D1 and an ESD diode D2; the negative pole of ESD diode D1 connects the VCC foot of transimpedance amplifier, and the second output of RSSI functional module is connected to the positive pole of ESD diode D1 and the negative pole of ESD diode D2, and the GND foot of transimpedance amplifier is connected to the positive pole of ESD diode D2.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211488970.1A CN115811283B (en) | 2022-11-25 | 2022-11-25 | Anti-wifi signal interference circuit of transimpedance amplifier |
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| CN202211488970.1A CN115811283B (en) | 2022-11-25 | 2022-11-25 | Anti-wifi signal interference circuit of transimpedance amplifier |
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| CN115811283A true CN115811283A (en) | 2023-03-17 |
| CN115811283B CN115811283B (en) | 2024-09-27 |
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|---|---|---|---|---|
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| CN101335503A (en) * | 2007-06-28 | 2008-12-31 | 冲电气工业株式会社 | Preamplifier and light receiving device |
| CN101807885A (en) * | 2010-03-10 | 2010-08-18 | 烽火通信科技股份有限公司 | Method and circuit for controlling output signals of trans-impedance amplifier |
| CN201584972U (en) * | 2009-12-04 | 2010-09-15 | 天津光电通信技术有限公司 | Optical receiving module with large dynamic range and low noise |
| US20170104537A1 (en) * | 2015-10-12 | 2017-04-13 | Stmicroelectronics S.R.L. | Transimpedance amplifier, and related integrated circuit and optical receiver |
| CN111404494A (en) * | 2020-06-04 | 2020-07-10 | 微龛(广州)半导体有限公司 | Transimpedance amplifier chip and optical receiving module |
| CN112118052A (en) * | 2019-06-21 | 2020-12-22 | 华为技术有限公司 | Optical receiving components, optical transceiver components, optical modules and optical network equipment |
| CN114551426A (en) * | 2022-02-10 | 2022-05-27 | 成都明夷电子科技有限公司 | Trans-impedance amplifier chip with WiFi interference signal capability and packaging method thereof |
| CN114679142A (en) * | 2020-12-24 | 2022-06-28 | 上海新微技术研发中心有限公司 | DC recovery module and photoelectric detection circuit |
-
2022
- 2022-11-25 CN CN202211488970.1A patent/CN115811283B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050052246A1 (en) * | 2003-09-05 | 2005-03-10 | Visocchi Pasqualino Michele | Fully integrated received signal strength indicator for a transimpedance amplifier |
| CN101335503A (en) * | 2007-06-28 | 2008-12-31 | 冲电气工业株式会社 | Preamplifier and light receiving device |
| CN201584972U (en) * | 2009-12-04 | 2010-09-15 | 天津光电通信技术有限公司 | Optical receiving module with large dynamic range and low noise |
| CN101807885A (en) * | 2010-03-10 | 2010-08-18 | 烽火通信科技股份有限公司 | Method and circuit for controlling output signals of trans-impedance amplifier |
| US20170104537A1 (en) * | 2015-10-12 | 2017-04-13 | Stmicroelectronics S.R.L. | Transimpedance amplifier, and related integrated circuit and optical receiver |
| CN112118052A (en) * | 2019-06-21 | 2020-12-22 | 华为技术有限公司 | Optical receiving components, optical transceiver components, optical modules and optical network equipment |
| CN111404494A (en) * | 2020-06-04 | 2020-07-10 | 微龛(广州)半导体有限公司 | Transimpedance amplifier chip and optical receiving module |
| CN114679142A (en) * | 2020-12-24 | 2022-06-28 | 上海新微技术研发中心有限公司 | DC recovery module and photoelectric detection circuit |
| CN114551426A (en) * | 2022-02-10 | 2022-05-27 | 成都明夷电子科技有限公司 | Trans-impedance amplifier chip with WiFi interference signal capability and packaging method thereof |
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