CN104617879A - UHF-band wide-band voltage-controlled oscillator - Google Patents
UHF-band wide-band voltage-controlled oscillator Download PDFInfo
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- CN104617879A CN104617879A CN201410670367.4A CN201410670367A CN104617879A CN 104617879 A CN104617879 A CN 104617879A CN 201410670367 A CN201410670367 A CN 201410670367A CN 104617879 A CN104617879 A CN 104617879A
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- triode
- controlled oscillator
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- starting
- oscillation
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Abstract
The invention provides a UHF-band wide-band voltage-controlled oscillator and aims at solving the problem that a plurality of voltage-controlled oscillator often are required to realize frequency coverage on the whole UHF band because the traditional Colpitts three-end voltage-controlled oscillator is small in tuning range and generally has the working band of 10%-20%. The base and the collector of an oscillation starting triode 1 are connected with an active biasing circuit 2; the base and the emitter of the oscillation starting triode 1 are connected with a positive feedback network 3; the base of the oscillation starting triode 1 is connected with a wide-band tuning network 4; the output of the oscillation starting triode 1 is connected with a buffer amplifier.
Description
technical field:
The present invention is relevant with the oscillator obtaining higher frequency of oscillation.
background technology:
In order to obtain higher frequency of oscillation, existing UHF waveband voltage controlled oscillator adopts Kao Bici trifocal oscillator form usually, but traditional Kao Bici trifocal voltage controlled oscillator tuning range is less, usually the working band of 10% ~ 20% is only had, therefore to realize the frequency coverage to whole UHF waveband, usually need multiple voltage controlled oscillator.
summary of the invention:
The object of this invention is to provide a kind of structure simple, tuning bandwidth is large, has the UHF waveband wideband voltage controlled oscillator of higher phase noise.
The present invention is achieved in that
UHF waveband wideband voltage controlled oscillator, base stage, the collector electrode of starting of oscillation triode 1 are connected with active bias circuit 2, base stage, the emitter of starting of oscillation triode 1 are connected with positive feedback network 3, the base stage of starting of oscillation triode 1 is connected with wide-band tuning network 4, and the output of starting of oscillation triode 1 is connected with buffer amplifier 5.
UHF waveband wideband voltage controlled oscillator, active bias circuit 2 is by the 2nd triode VT1 and the 1-5 resistance R1, R2, R3, R4, R5 forms active bias circuit, for the base stage of starting of oscillation triode 1 (VT2) and collector electrode provide direct current biasing, positive feedback network 3 is by electricity the 1st, 2 electric capacity C11, C12 and the 6th resistance R10 is formed, when ensureing the work of VT2, output impedance is negative impedance, wide-band tuning network 4 is by the 1-6 inductance L 18, L5, L6, L7, L9, L11, 3rd electric capacity C10 and the 1-8 variable capacitance diode VD1 ~ VD8 is formed jointly, buffer amplifier 5 is by the 3rd triode VT3, 4-11 electric capacity C1, C2, C5, C6, C7, C8, C13 and the 7-11 resistance R11, R9, R6, R7, R8, 7th inductance L 1 is formed jointly.
Functions is summarized as follows:
1) starting of oscillation triode adopts BFS520, BFS520 to have low-noise factor and lower corner frequency, and its quiescent operation point selection, at VCE=5V, IC=10mA, ensures that output signal has lower phase noise;
2) active bias circuit uses triode BCM857BS to provide stable quiescent point for BFS520, ensures its job stability under high/low temperature;
3) feedback capacity of positive feedback network ensures that starting of oscillation feedback loop forms positive feedback networking, the state making starting of oscillation triode operationally for negative impedance exports;
4) wide-band tuning network is become with resonance inductive bank by many variable capacitance diode RKV501KJ, can realize the tuning range being better than 300MHz bandwidth;
5) buffer amplifier is made up of triode BFG540, can effectively reduce the load balance factor effect of voltage controlled oscillator.
Beneficial effect of the present invention:
UHF waveband wideband voltage controlled oscillator can realize UHF waveband 558MHz ~ 858MHz output signal, its bandwidth of operation is greater than 40%, UHF waveband wideband voltage controlled oscillator is by using broadband feedback network, realize the wide-band tuning of UHF waveband, tuning bandwidth is greater than 300MHz, while guarantee tuning bandwidth, what ensure oscillator has higher phase noise, phase noise is better than 80dBc/Hz@1KHz, 110dBc/Hz@10KHz, 123Bc/Hz@100KHz.
accompanying drawing illustrates:
Fig. 1 is the block diagram of UHF waveband wideband voltage controlled oscillator.
Fig. 2 is the circuit theory diagrams of UHF waveband wideband voltage controlled oscillator.
embodiment:
Embodiment:
Physical circuit embodiment as shown in Figure 2.
Starting of oscillation triode VT2 is BFS520, and quiescent operation point selection is at VCE=5V, IC=10mA.Triode VT1 is BCM857BS, it and resistance R1, R2, R3, R4, R5 form active bias circuit, for the base stage of starting of oscillation triode VT2 and collector electrode provide direct current biasing, inductance L 10 and L12 provide direct current biasing for starting of oscillation triode VT2 emitter, ensure that the resistance exchanged over the ground is high-impedance state simultaneously.Electric capacity C11, C12 and resistance R10 form positive feedback network, and when ensureing the work of VT2, output impedance is negative resistance, for VT2 starting of oscillation provides necessary condition.Inductance L 18, L5, L6, L7, L9, L11, electric capacity C10 and variable capacitance diode VD1 ~ VD8 forms wide-band tuning network jointly, ensures that oscillator operation is in assigned frequency, and realizes wide-band tuning.Electric capacity C9 is coupling capacitance, realizes the weak coupling between wide-band tuning network and starting of oscillation triode VT2, ensures the high q-factor of wide-band tuning network.Triode VT3 is BFS540, it and electric capacity C1, C2, C5, C6, C7, C8, C13 and resistance R11, R9, R6, R7, R8, inductance L 1 forms buffer amplifier jointly, operate outside load (external circuit when external loading is voltage controlled oscillator work, does not belong to voltage-controlled oscillator circuit itself) when isolation triode VT2 and voltage controlled oscillator work, improves the load pulling potential of voltage controlled oscillator.
UHF waveband wideband voltage controlled oscillator is tested by the spectrum analyzer FSP7 of RS company, measured result is as shown in table 1, as can be seen from Table 1, its working band is 558MHz ~ 858MHz, and bandwidth of operation is 300MHz, relative bandwidth of operation is 40%, use spectrum analyzer FSP7 service oscillator phase noise to show, in the bandwidth of operation of 558MHz ~ 858MHz, the phase noise of oscillator is better than 80dBc/Hz@1KHz simultaneously, 110dBc/Hz@10KHz, 123Bc/Hz@100KHz.
Table 1 UHF waveband wideband voltage controlled oscillator operating voltage and output frequency and phase noise test result
Components and parts detail list is as shown in table 2.
Table 2 UHF waveband wideband voltage controlled oscillator components and parts detail list
Claims (2)
1.UHF band broadband voltage controlled oscillator, it is characterized in that the base stage of starting of oscillation triode (1), collector electrode are connected with active bias circuit (2), base stage, the emitter of starting of oscillation triode are connected with positive feedback network (3), the base stage of starting of oscillation triode is connected with wide-band tuning network (4), and the output of starting of oscillation triode is connected with buffer amplifier (5).
2. UHF waveband wideband voltage controlled oscillator according to claim 1, it is characterized in that active bias circuit (2) is by the 2nd triode VT1 and the 1-5 resistance R1, R2, R3, R4, R5 forms active bias circuit, for the base stage of starting of oscillation triode (1) and collector electrode provide direct current biasing, positive feedback network (3) is by electricity the 1st, 2 electric capacity C11, C12 and the 6th resistance R10 is formed, when ensureing the work of starting of oscillation triode, output impedance is negative impedance, wide-band tuning network (4) is by the 1-6 inductance L 18, L5, L6, L7, L9, L11, 3rd electric capacity C10 and the 1-8 variable capacitance diode VD1 ~ VD8 is formed jointly, buffer amplifier (5) is by the 3rd triode VT3, 4-11 electric capacity C1, C2, C5, C6, C7, C8, C13 and the 7-11 resistance R11, R9, R6, R7, R8, 7th inductance L 1 is formed jointly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410670367.4A CN104617879A (en) | 2014-11-20 | 2014-11-20 | UHF-band wide-band voltage-controlled oscillator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410670367.4A CN104617879A (en) | 2014-11-20 | 2014-11-20 | UHF-band wide-band voltage-controlled oscillator |
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| Publication Number | Publication Date |
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| CN104617879A true CN104617879A (en) | 2015-05-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410670367.4A Pending CN104617879A (en) | 2014-11-20 | 2014-11-20 | UHF-band wide-band voltage-controlled oscillator |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112953393A (en) * | 2021-04-09 | 2021-06-11 | 东南大学 | Broadband voltage-controlled oscillator with low phase noise |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2299422Y (en) * | 1998-01-06 | 1998-12-02 | 大卫·席门 | Broadband electronic oscillator |
| CN1310879A (en) * | 1998-07-20 | 2001-08-29 | 瓦里－L公司 | Oscillator with power conservation mode |
| CN1528046A (en) * | 2001-05-21 | 2004-09-08 | 汤姆森特许公司 | Wide band voltage controlled crystal oscillator |
-
2014
- 2014-11-20 CN CN201410670367.4A patent/CN104617879A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2299422Y (en) * | 1998-01-06 | 1998-12-02 | 大卫·席门 | Broadband electronic oscillator |
| CN1310879A (en) * | 1998-07-20 | 2001-08-29 | 瓦里－L公司 | Oscillator with power conservation mode |
| CN1528046A (en) * | 2001-05-21 | 2004-09-08 | 汤姆森特许公司 | Wide band voltage controlled crystal oscillator |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112953393A (en) * | 2021-04-09 | 2021-06-11 | 东南大学 | Broadband voltage-controlled oscillator with low phase noise |
| CN112953393B (en) * | 2021-04-09 | 2023-09-29 | 东南大学 | Broadband voltage-controlled oscillator with low phase noise |
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Application publication date: 20150513 |
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| RJ01 | Rejection of invention patent application after publication |