JPH01256203A - Microwave oscillation circuit - Google Patents

Abstract

PURPOSE:To reduce the physical size of a dielectric resonator or a cavity resonator of the oscillator by generating a signal having a frequency being a multiple of N with respect to the frequency of an output signal from the oscillator, applying 1/N frequency division to the signal, amplifying and outputting the signal. CONSTITUTION:The oscillator 1 is provided with a dielectric resonator or a cavity resonator, which is oscillated at a frequency being a multiple of N (N is an integral number being 2 or over) of a frequency f0 of an output signal V0. A frequency divider 2 frequency-divides the frequency Nf0 of the signal from the oscillator 1 to 1/N to output a signal of the frequency f0. Then an amplifier 3 amplifies a signal from the frequency divider 2 up to a power required for the use of a local oscillator of a microwave communication equipment, etc., and outputs an output signal V0 of the frequency f0 from an output terminal T0. The oscillated frequency of the oscillator 1 is multiplied by a factor N of the frequency f0 of the output signal V0 to reduce the physical size of the dielectric resonator or cavity resonator of the oscillator used for the oscillator 1 to 1/N in length and to 1/N<3> in volume.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a microwave oscillation circuit, which is particularly used in microwave communication equipment, microwave measuring instruments, etc., and uses dielectric resonators, cavity resonators, etc. This invention relates to a microwave oscillation circuit.

[Conventional technology]

Conventionally, when this type of microwave oscillation circuit is used as a local oscillator with high signal purity used in microwave communication equipment or measuring instruments, a dielectric oscillation circuit in which the oscillation circuit is configured with a dielectric resonator and a transistor, Alternatively, a cavity oscillation circuit, in which the oscillation circuit is constructed of a cavity resonator and a transistor, has been used.

[Problem to be solved by the invention]

The conventional microwave oscillation circuit described above has a configuration that uses a dielectric resonator or a cavity resonator, so in either case, the physical dimensions of the resonator, such as the diameter for a circular dielectric resonator The oscillation frequency is determined by the thickness, the dimensions of the space that accommodates the resonator, and, in the case of a cavity resonator, the length, width, and height, so even in the microwave band, for example,
When attempting to create a microwave oscillation circuit with a low frequency such as 5 GHz, the physical dimensions become large and there is a drawback that miniaturization is impossible.

An object of the present invention is to provide a microwave oscillation circuit that can be miniaturized by reducing the physical dimensions of a resonator even in a relatively low frequency band of the microwave band.

[Means to solve the problem]

The microwave oscillation circuit of the present invention includes a resonator, an oscillator that generates a signal with a frequency N times the frequency of an output signal (N is an integer of 2 or more), and a signal from the oscillator that is divided by 1/H. and an amplifier that amplifies the signal from the frequency divider and outputs the output signal.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing a first embodiment of the present invention.

The oscillator 1 includes a dielectric resonator or a cavity resonator, and is a dielectric oscillator or cavity oscillator that oscillates at N times the frequency fO of the output signal VO (N is an integer of 2 or more).

The frequency divider 2 receives the frequency Nf of the signal from the oscillator 1.

Divide the frequency by 1/N to get the frequency f. Outputs the signal.

The amplifier 3 amplifies the signal from the frequency divider 2 to the power necessary for use as a local oscillator of a microwave communication device, etc., and outputs it from the output terminal To as an output signal o having a frequency f.

In this way, the oscillation frequency of oscillator 1 is the output signal.

■By increasing the frequency of o by N times the frequency fo, the physical dimensions of the dielectric resonator, cavity resonator, etc. used in the oscillator 1 can be reduced to 1/H, and the volume can be reduced to 1/N3. Therefore, even in a relatively low frequency band of the microwave band, it is possible to miniaturize the microwave oscillation circuit and the microwave communication equipment, microwave measuring instrument, etc. that use the circuit.

Furthermore, since the frequency divider 2 and the amplifier 3 are interposed between the oscillator 1 and the output terminal To, by providing the amplifier 3 with appropriate filter characteristics, the phase noise of the oscillator 1 can be reduced by using the frequency divider, for example. If 2 is divided by 1/2, the improvement can be achieved by 6 dB, and if it is divided by 1/4, it is improved by 12 dB, and spurious noise can be reduced.

Furthermore, since the oscillator 1 can be separated from the load,
Fluctuations in oscillation frequency, fluctuations in power, etc. due to load fluctuations can be removed.

FIG. 2 is a block diagram showing a second embodiment of the invention.

In this embodiment, a dielectric oscillator or cavity oscillator whose frequency can be controlled by voltage is used as the oscillator IA, and the oscillator 1^, frequency dividers 2 and 5, phase comparator 6, and low-pass filter 7 provide This configuration is a PLL circuit for the reference signal of the reference oscillator 4, and has the same effects as the first embodiment, as well as the advantage of higher frequency accuracy and single-frequency stability.

〔Effect of the invention〕

As explained above, the present invention generates a signal with a frequency N times the frequency of an output signal using an oscillator, and converts this signal into 1/
By adopting a configuration in which the frequency is divided by H, amplified, and output, the physical dimensions of the dielectric resonator, cavity resonator, etc. of the oscillator can be reduced, so even in the relatively low frequency band of the microwave band, this can be achieved. Microwave oscillation circuits and microwave communication equipment, microwave measuring instruments, etc. in which this microwave oscillation circuit is used can be miniaturized, and a frequency divider and amplifier can be interposed between the oscillator and the output end. Therefore, it is possible to reduce phase noise and spurious, and it is also possible to eliminate fluctuations in oscillation frequency, power, etc. due to load fluctuations.

[Brief explanation of the drawing]

1 and 2 are block diagrams showing first and second embodiments of the present invention, respectively. 1. IA... Oscillator, 2... Frequency divider, 3... Amplifier, 4... Reference oscillator, 5... Frequency divider, 6... Phase comparator, 7... Reduction filter. Agent: Patent Attorney Shinto Uchihara Z Drawing Procedure Amendment (Spontaneous) 1. Indication of the case: 1984 Patent Application No. 084286 2
, Title of the invention Microwave oscillator circuit 3, Relationship to the case of the person making the amendment Application Person Place of application
5-33-1 Shiba, Minato-ku, Tokyo Name (423)
) NEC Corporation Representative: Tadahiro Sekimoto 4, Agent address: Sumitomo Sanda Building, 37-8 Shiba 5-chome, Minato-ku, Tokyo 108 (contact address: NEC Corporation Patent Department) 5. Specification subject to amendment ``Detailed Description of the Invention'' column and ``Figure 1'' of the drawings. 6. Contents of amendment (1) Specification, page 4, line 12, r It can be made smaller. After "r", the oscillator 1 used in the present invention only needs to operate the frequency divider 2, so the output power can be reduced. ” is inserted. (2) Page 4, lines 14 and 15, “and amplifier 3
is present, so "give the amplifier 3 appropriate filter characteristics" is corrected to "contains". (3) On page 4, line 18, “also” is replaced with “further amplifier 3
"If you use something with a bandpass effect," he corrects. (4) Page 4, line 20, “Oscillator 1 is J”
is corrected as "due to the inclusion of frequency divider 2 and amplifier 3". (5) “Figure 1” of the drawings shall be amended as shown in the attached sheet.

Claims (1)

[Claims] An oscillator that includes a resonator and generates a signal with a frequency that is N times the frequency of the output signal (N is an integer of 2 or more), a frequency divider that divides the signal from this oscillator by 1/N, and a frequency divider. and an amplifier that amplifies a signal from and outputs the output signal.