JPH0697736A - Injection synchronizing type multiplying oscillator - Google Patents

Abstract

PURPOSE:To obtain the oscillator of a high frequency band of a wide band, and also, a high performance, and moreover, to lower the power consumption of a frequency synthesizer by varying an oscillation frequency of a push-push oscillator in accordance with an output frequency of the frequency synthesizer. CONSTITUTION:With respect to a high frequency ground point of a split ring resonator 6 resonated to a frequency f0 of a frequency synthesizer 7, f0 is supplied to parallel connecting lines 9 whose left and right are equal, and a push- push oscillator 3 is injected and synchronized with the oscillation frequency f0 through the resonator 6. In this case, a variable capacity 8 is connected to an opening end of the resonator 6, a control voltage of the oscillator 3 is allowed to correspond to switching of a frequency of a synthesizer by a D/A converter 10 and the oscillation frequency of the oscillator 3 is also varied simultaneously, and an injection synchronizing multiplying oscillation of a wide band is executed. In such a way, the oscillator which maintains a high performance, and has a high frequency band of a wide band can be obtained. Also, since the synthesizer is operated by a fundamental frequency f0, the power consumption can be lowered in a high frequency band.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection locking type multiplication oscillator used for various radio equipment for high frequency, communication equipment and the like.

[0002]

2. Description of the Related Art In recent years, the demand for mobile communication has rapidly increased, and systems using the quasi-microwave band which is a new applicable frequency resource have been developed. A push-push oscillator is often used as a configuration of a high-frequency band oscillator. (For example, IEEE of December 1985
Described in Trans. MTT. (20-40 GHz Push-Push Direction Resonator Oscillator, A. Pavio and M. Smith, I.E.
E-E Transformer. M.T.T., December 1985: A 20-40GHz push-push dielecric resonator o
scillator, A. Pavio and M. Smith, IEEE Trans. MTT, De
c. 1985)) Hereinafter, a conventional high frequency band oscillator will be described.

FIG. 4 shows the entire circuit configuration of a conventional high frequency band oscillator. In FIG. 4, 1 is a dielectric resonator, 2 is a coupling line with the dielectric resonator 1, 3 is a push-push oscillator composed of two negative resistance active circuits, 4 is an in-phase combining circuit, and 5 is a high frequency output terminal. is there.

The operation of the high-frequency band oscillator configured as described above will be described below.

First, the push-push oscillator 3 oscillates at a fundamental resonance frequency f ₀ determined by the dielectric resonator 1 and the coupling line 2 with the resonator 1. The two outputs of the push-push oscillator 2 are in reverse phase at f ₀ and in phase with the second harmonic wave 2f ₀ , and only the second harmonic wave 2f ₀ is output to the high-frequency output terminal 5 by the in-phase synthesis circuit 4, and f ₀ can be suppressed. .

[0006]

However, in the above-mentioned conventional configuration, since the push-push oscillator has two oscillation circuits built-in, it is difficult to adjust the characteristics such as S / N and C / N, and a wide band is required. When a push-push oscillator is used as an oscillator and a frequency control configuration is used to increase the frequency sensitivity to the control voltage, there is a problem that characteristics such as S / N and C / N are rapidly deteriorated.

Further, when a frequency synthesizer is constructed using the in-phase combined output of the push-push oscillator, a frequency divider for directly dividing the output frequency is required, but the frequency divider operating at high speed consumes when the frequency becomes high. There was a problem that the electric power increased at an accelerating rate.

The present invention solves the above-mentioned problems of the prior art, and realizes a wide-band and high-performance oscillator without impairing the characteristics of the push-push oscillator, and low power consumption of the frequency synthesizer using the oscillator. The purpose is to realize

[0009]

In order to achieve this object, the present invention provides a frequency synthesizer for changing an output frequency according to frequency setting information, a split ring resonator for determining an oscillation frequency of a push-push oscillator, A push-push oscillator consisting of a coupling circuit for injecting the output of the frequency synthesizer into the split ring resonator, two negative resistance active circuits connected to the split ring resonator, and an in-phase combination of the two outputs of the push-push oscillator in phase In an injection-locking type multiplication oscillator composed of a synthesizing circuit, the push-push oscillator has a voltage-controlled oscillator configuration, and the control voltage of the voltage-controlled oscillator that constitutes a D / A converter or a frequency synthesizer is used to It has a configuration for controlling the oscillation frequency.

[0010]

According to the present invention, the frequency synthesizer (f ₀ ) output for changing the output frequency according to the frequency setting information is pushed and pushed by the two negative resistance active circuits via the split ring resonator having the resonance frequency f _0. Input to the oscillator, injection-lock the push-push oscillator to the oscillation frequency f ₀ , and perform in-phase synthesis of the output of the active circuit side by the in-phase synthesis circuit to efficiently obtain the double-wave output (2f ₀ ) Injection-locked multiplication In the oscillator, the push-push oscillator is configured as a voltage-controlled oscillator by connecting a variable capacitor to the open end of the split-ring resonator, and the oscillation frequency of the push-push voltage-controlled oscillator can be changed simultaneously in response to the frequency switching of the frequency synthesizer. , A broadband and high-performance oscillator without losing the characteristics of the push-push oscillator. Can be realized. Further, since the frequency synthesizer is operated with the fundamental wave f ₀ , the synthesizer in the high frequency band can be realized with low power consumption.

[0011]

(Embodiment 1) A first embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block connection diagram of an injection locking type multiplication oscillator according to a first embodiment of the present invention.

In FIG. 1, the functions of the components numbered 3 to 5 are the same as those in FIG.
Reference numeral 6 is a split ring resonator formed by a U-shaped strip line, 7 is a frequency synthesizer, and 8 is a split-ring resonator 6 having open-ended capacitors C1 and C for blocking direct current.
Variable capacitors connected through 2, L1 and L2 are high frequency blocking inductors each having one end connected to the variable capacitor 8, and 9 is the split ring resonance for injecting the output of the frequency synthesizer 7 into the split ring resonator 6. Parallel-coupled line for the device 6 is a push-push oscillator 3
D / A (digital / analog) to generate control voltage
It is a converter.

In the injection-locked type multiplication oscillator configured as described above, first, the split ring resonator 6 is used as a resonator.
By using, compared to the case of using a dielectric resonator,
It is possible to make the resonator compact and flat.

Further, by using an ordinary Colpitts type oscillation circuit or the like for the voltage controlled oscillator constituting the frequency synthesizer (f ₀ ) 7, a wide band and high performance oscillator can be easily realized.

Then, a parallel coupling line 9 is arranged so as to have an equal electrical length on the left and right with respect to the high frequency grounding point of the split ring resonator 6 resonating at the frequency f ₀ , one end of the line is grounded, and the other end is By inputting the output of the frequency synthesizer 7, the push-push oscillator 3 is injection-locked to the oscillation frequency f ₀ via the resonator 6.

FIG. 2 shows the injection locking characteristic. From Figure 2
As is clear, the output frequency of the frequency synthesizer 7
Oscillation frequency of push-push oscillator 3 is almost the same
Synchronized at a low injection level if
The greater the injection level, the more
When the frequency difference occurs, the synchronization is lost. Split ring
Connect the variable capacitor 8 to the open end of the resonator 6 and push
The oscillator 3 has a voltage control configuration and frequency
Control voltage of push-push oscillator 3 with constant information as input
The D / A converter 10 for outputting
The push-push voltage corresponding to the frequency switching of the 7
By changing the oscillation frequency of the controlled oscillator 3 at the same time,
A wide-band injection-locked type multiplication oscillator can be realized.
In-phase synthesis of two outputs by the in-phase synthesis circuit 4.
Then, the high frequency output terminal 5 ₀To get

At this time, the characteristics of the injection-locked type multiplication oscillator are determined by the characteristics of the frequency synthesizer 7 to be injected.
Even if the frequency sensitivity of the push-push voltage controlled oscillator to the control voltage is increased, the characteristics such as S / N and C / N do not deteriorate.

Further, since the frequency synthesizer 7 operates at the fundamental frequency (f ₀ ), the frequency divider which constitutes the synthesizer consumes a small amount of current and can realize a frequency synthesizer in a high frequency band with low power consumption. it can.

By adopting the above configuration, it is possible to realize a high frequency band oscillator having a wide band and high performance with a simple configuration and adjustment without deteriorating the characteristics of the push-push oscillator 3. Further, since the frequency synthesizer 7 is operated with the fundamental wave f ₀ , it is possible to realize a synthesizer in a high frequency band with low power consumption.

As described above, according to this embodiment, the frequency synthesizer 7 that changes the output frequency according to the frequency setting information, the split ring resonator 6 that determines the oscillation frequency of the push-push oscillator 3, and the frequency synthesizer 7 are provided. A push-push oscillator 3 including a coupling circuit 9 for injecting the output of the above into the split ring resonator 6 and two negative resistance active circuits connected to the split ring resonator 6.
In the injection-locking type multiplication oscillator configured by the in-phase synthesizing circuit 4 for synthesizing the two outputs of the push-push oscillator 3 in-phase, the variable capacitance 8 is connected to the open end of the split ring resonator 6, and the push-push oscillator 6 is connected. Oscillation of the push-push oscillator 3 corresponding to the frequency switching of the frequency synthesizer 7 by using the D / A converter 10 which has the voltage-controlled oscillator configuration and outputs the control voltage of the push-push oscillator 3 with the frequency setting information as an input. By changing the frequency at the same time, it is possible to realize an oscillator in a wide high frequency band while maintaining high performance.

(Second Embodiment) A second embodiment of the present invention will be described below with reference to the drawings.

FIG. 3 is a block connection diagram of an injection locking type multiplication oscillator according to the second embodiment of the present invention.

In FIG. 3, the functions of the components numbered 3 to 9 are the same as those in FIG.
The configuration of FIG. 3 is different from that of FIG. 1 in that a voltage dividing circuit 11 is newly provided and the control voltage of the voltage controlled oscillator constituting the frequency synthesizer 7 is used to make the voltage controlled oscillator 7
Since the oscillation frequency of No. 1 is controlled and the other basic operations are the same as those of the first embodiment, the description will be omitted. In addition,
The detailed configuration of the frequency synthesizer 7 is a known one, and its voltage control oscillator 71, reference oscillator 72, frequency dividers 73 and 7 are used.
4, a phase comparator 75, a charge pump 76, and a loop filter 77.

As described above, according to this embodiment, the frequency synthesizer 7 that changes the output frequency according to the frequency setting information, the split ring resonator 6 that determines the oscillation frequency of the push-push oscillator 3, and the frequency synthesizer 7 are provided. A push-push oscillator 3 including a coupling circuit 9 for injecting the output of the above into the split ring resonator 6 and two negative resistance active circuits connected to the split ring resonator 6.
And an injection-locking type multiplication oscillator composed of an in-phase synthesizing circuit 4 for synthesizing the two outputs of the push-push oscillator 3 in-phase, the variable capacitance 8 is connected to the open end of the split ring resonator 6, and the push-push oscillator 3 is connected. With the voltage-controlled oscillator configuration, the control voltage of the voltage-controlled oscillator 71 that constitutes the frequency synthesizer 7 is divided, and the oscillation frequency of the push-push oscillator 3 is also changed at the same time in response to the frequency switching of the frequency synthesizer 7. It is possible to realize a wide band high frequency band oscillator while maintaining high performance.

Although the resonator is the split ring resonator 6 in the embodiment, it may be a normal half-wave resonator. Further, it is not necessary to change the oscillation frequency of the push-push oscillator 3 for each channel frequency of the frequency synthesizer 7, and a plurality of fixed capacitors are connected to the open end of the resonator via a switch and the push-push oscillator is switched. It goes without saying that a configuration in which the oscillation frequency of 3 is changed is also acceptable.

[0026]

As described above, according to the present invention, a frequency synthesizer that changes an output frequency according to frequency setting information, a resonator that determines an oscillation frequency of a push-push oscillator including two negative resistance active circuits, A coupling circuit for injecting the output of the frequency synthesizer into the resonator;
And an injection locking type multiplication oscillator configured by an in-phase synthesizing circuit for synthesizing two outputs of the push-push oscillator in-phase, and changing the oscillation frequency of the push-push oscillator according to the output frequency of the frequency synthesizer. In addition to realizing an excellent high frequency band oscillator having a wide band and high performance, the power consumption of a frequency synthesizer using the oscillator is reduced.

[Brief description of drawings]

FIG. 1 is an overall block connection diagram of an injection locking type multiplication oscillator according to a first embodiment of the present invention.

FIG. 2 is an injection locking characteristic diagram in the example.

FIG. 3 is an overall block connection diagram of an injection locking type multiplication oscillator according to a second embodiment of the present invention.

FIG. 4 is an overall block connection diagram of a conventional high frequency band oscillator.

[Explanation of symbols]

 1 Dielectric Resonator 2 Coupling Line 3 Push-Push Oscillator 4 In-Phase Synthesis Circuit Filter 5 High Frequency Output Terminal 6 Split Ring Resonator 7 Frequency Synthesizer 8 Variable Capacitance 9 Parallel Coupling Line 10 D / A Converter 11 Voltage Divider

Claims (6)

[Claims] 1. A frequency synthesizer for changing an output frequency according to frequency setting information, a resonator for determining an oscillation frequency of a push-push oscillator including two negative resistance active circuits, and an output of the frequency synthesizer for the resonance. A coupling circuit for injecting the signal into the input device and an injection-locked multiplication oscillator configured by an in-phase combining circuit for combining the two outputs of the push-push oscillator in phase, and the oscillation frequency of the push-push oscillator is output from the frequency synthesizer. An injection locking type multiplication oscillator characterized by being changed according to frequency. 2. A split ring resonator or a half wavelength resonator is used as the resonator, and a push-push oscillator composed of a negative resistance active circuit is provided at the two open ends of the resonator. Injection-locked multiplication oscillator. 3. The injection-locked multiplication oscillator according to claim 1, wherein a variable capacitance is connected to the open end of the resonator, and the push-push oscillator has a voltage-controlled oscillator configuration. 4. The injection-locked multiplication oscillator according to claim 3, further comprising a digital / analog converter which receives the frequency setting information and outputs the control voltage of the push-push voltage controlled oscillator. 5. The injection-locked multiplier oscillator according to claim 3, wherein the oscillation frequency of the push-push voltage-controlled oscillator is controlled by using the control voltage of the voltage-controlled oscillator that constitutes the frequency synthesizer. 6. The injection locking according to claim 1, wherein a plurality of fixed capacitors are connected to the open end of the resonator through a switch, and the oscillation frequency of the push-push oscillator is changed by switching the switch. Frequency multiplication oscillator.