CN103618546A - Ultra wide octave voltage-controlled oscillation realizing method - Google Patents
Ultra wide octave voltage-controlled oscillation realizing method Download PDFInfo
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- CN103618546A CN103618546A CN201310607858.XA CN201310607858A CN103618546A CN 103618546 A CN103618546 A CN 103618546A CN 201310607858 A CN201310607858 A CN 201310607858A CN 103618546 A CN103618546 A CN 103618546A
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- vco
- frequency
- controlled oscillator
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Abstract
The invention relates to the field of frequency synthesis, in particular to an ultra wide octave voltage-controlled oscillation realizing method. According to the technical scheme of the ultra octave voltage-controlled oscillation realizing method, a variable voltage source VT is input to a voltage-controlled oscillator (VCO) from the outside, the VCO outputs corresponding frequency to a Mix, an OSC outputs preset fixed frequency signals to the Mix, the Mix outputs signals, to be filtered, formed by mixing the frequency signal of a high-frequency VCO, the frequency signal of a fixed oscillator (OSC) and differential frequency signals, and finally an LPF filters peak frequency signals and only outputs the differential frequency signals. The oscillating frequency output coverage frequency band of the technical scheme is wide, and the output range of the voltage-controlled oscillator can be changed as long as the output of the fixed oscillator and the passband range of a corresponding low pass filter are changed. The output frequency of the VCO is flexible and variable. The circuit structure is simple and easy to realize. System complexity is low.
Description
Technical field
The present invention relates to frequency synthesis field, be specifically related to a kind of implementation method of super wide octave VCO.
Background technology
Ultra wide band frequency source has been widely used in communication, observing and controlling, radar, electronic countermeasures and other electronic systems, becomes indispensable core component.The VCO of ultra broadband, high-performance, miniaturization is tuning in order to realize the fast frequency of frequency synthesizer as adjustable signal generator, is the critical component in ultra wide band frequency source.At present, ultra broadband VCO mostly divides through frequency range, adopt a plurality of VCO to switch to realize ultra broadband, but the method has increased the complexity of system, be difficult for realizing, and frequency sweep output spectrum is discontinuous in segmentation place.Therefore, how to provide the implementation method of function admirable, the reliable and stable super wide octave VCO of one-part form to become an important subject.
Summary of the invention
(1) technical problem that will solve
The technical problem to be solved in the present invention is to provide the implementation method of the super wide octave VCO of a kind of one-part form, requires it can avoid frequency range division, many VCO that current super wide octave voltage controlled oscillator adopts to switch implementation.
(2) technical scheme
For solving the problems of the technologies described above, the invention provides a kind of implementation method of super wide octave VCO, described method is implemented based on super wide octave voltage controlled oscillator, described super wide octave voltage controlled oscillator comprises: high band voltage controlled oscillator VCO, fixed oscillator OSC, frequency mixer Mix and low pass filter LPF;
The implementation method of described super wide octave VCO specifically comprises the steps:
Step S1: outside input variable voltage source V
tparamount frequency range voltage controlled oscillator VCO, controls the variable capacitance in high band voltage controlled oscillator VCO resonant tank, realizes voltage-frequency conversion, and high band voltage controlled oscillator VCO obtains corresponding frequency f
vand output;
Step S2: fixed oscillator OSC, according to the desired frequency output area of super wide octave voltage controlled oscillator and the intrinsic frequency-tuning range of high band voltage controlled oscillator VCO, determines default fixed frequency signal f
cand output;
Step S3: frequency mixer Mix receives the frequency signal from high band voltage controlled oscillator VCO and fixed oscillator OSC, the two is carried out to mixing, obtain the signal to be filtered mixing with frequency signal and slip frequency signal by high band voltage controlled oscillator VCO and fixed oscillator OSC;
Step S4: low pass filter LPF carries out filtering operation to described signal to be filtered, by filtering with frequency signal of high band voltage controlled oscillator VCO wherein and fixed oscillator OSC, select the slip frequency signal of output high band voltage controlled oscillator VCO and fixed oscillator OSC, complete the implementation procedure of super wide octave VCO.
(3) beneficial effect
In technical solution of the present invention, first by outside input variable voltage source VT to VCO, VCO exports corresponding frequency to Mix, the default fixed frequency signal of OSC output is simultaneously to Mix, after Mix mixing, output is by the signal to be filtered mixing with frequency signal and slip frequency signal of high band voltage controlled oscillator VCO and fixed oscillator OSC, last LPF filters and frequency signal, an output difference frequency signal.It is wide that the frequency of oscillation output of this technical scheme covers frequency range, the free transmission range that changes the output of fixed oscillator and the low pass filter of correspondence can change the output area of voltage controlled oscillator, the output frequency flexibility and changeability of voltage controlled oscillator, circuit structure is simple and be easy to realization, and system complexity is low.
Accompanying drawing explanation
Fig. 1 realizes the flow chart of super wide octave VCO in technical solution of the present invention implementation process.
Fig. 2 is the structured flowchart of the super wide octave voltage controlled oscillator of the present invention.
Fig. 3 is the schematic diagram of technical solution of the present invention implementation process.
Embodiment
For making object of the present invention, content and advantage clearer, below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.
The resonant tank of LC oscillator generally consists of fixed value inductance and the variable capacitance (variable capacitance diode) of high quality factor (Q value), but generally, in practical implementation, the capacitance of variable capacitance and excursion thereof are all less.Requiring the output frequency of oscillator is f
c, by resonant frequency equation
known, should select the inductance of higher value and the electric capacity of smaller value to realize.
By resonant frequency equation, can be obtained
for design frequency excursion, compared with for large VCO, should select the inductance of higher value and corresponding capacitance and all less electric capacity of excursion thereof to realize.But current integrated circuit technology does not realize the large inductance value inductance of high Q value, and the Q value of LC resonant tank is affected by the Q value of inductance mainly, be therefore difficult to realize the voltage controlled oscillator of super wide octave.
Adopt microstrip line can obtain the small inductor value inductance of high Q value, coordinate and select capacitance and all less electric capacity of excursion thereof, can obtain high band voltage controlled oscillator like this, its frequency values is higher and absolute bandwidth is all wider.Based on this, the invention provides a kind of implementation method of super wide octave VCO, described method is implemented based on super wide octave voltage controlled oscillator, described super wide octave voltage controlled oscillator, as shown in Figure 2, it comprises: high band voltage controlled oscillator VCO, fixed oscillator OSC, frequency mixer Mix and low pass filter LPF; Above four parts are equivalent to one super wide octave voltage controlled oscillator; Wherein, (1) V
tfor outside input variable voltage source, for regulating the bias voltage of high band voltage controlled oscillator VCO resonant tank variable capacitance (variable capacitance diode); (2) described high band voltage controlled oscillator VCO is a kind of signal generator of being controlled to produce corresponding frequencies by additional variable voltage source, i.e. voltage-frequency (V-F) change-over circuit, and its corresponding relation is generally linear mathematical relationship; Described high band voltage controlled oscillator VCO is for receiving the variable voltage source V of outside input
t, described variable voltage source V
tcontrol the variable capacitance in high band voltage controlled oscillator VCO resonant tank, realize voltage-frequency conversion, by high band voltage controlled oscillator VCO, obtain corresponding frequency f
vand output; (3) described fixed oscillator OSC, for according to the desired frequency output area of super wide octave voltage controlled oscillator and the intrinsic frequency-tuning range of high band voltage controlled oscillator VCO, determines default fixed frequency signal f
cand output; (4) described frequency mixer Mix is for receiving the frequency signal from high band voltage controlled oscillator VCO and fixed oscillator OSC, the two is carried out to mixing, obtain the signal to be filtered mixing with frequency signal and slip frequency signal by high band voltage controlled oscillator VCO and fixed oscillator OSC; (5) described low pass filter LPF is for carrying out filtering operation to described signal to be filtered, by filtering with frequency signal of high band voltage controlled oscillator VCO wherein and fixed oscillator OSC, select the slip frequency signal of output high band voltage controlled oscillator VCO and fixed oscillator OSC, complete the implementation procedure of super wide octave VCO;
As shown in Figure 1, the implementation method of described super wide octave VCO specifically comprises the steps:
Step S1: outside input variable voltage source V
tparamount frequency range voltage controlled oscillator VCO, controls the variable capacitance in high band voltage controlled oscillator VCO resonant tank, realizes voltage-frequency conversion, and high band voltage controlled oscillator VCO obtains corresponding frequency f
vand output;
Step S2: fixed oscillator OSC, according to the desired frequency output area of super wide octave voltage controlled oscillator and the intrinsic frequency-tuning range of high band voltage controlled oscillator VCO, determines default fixed frequency signal f
cand output;
Step S3: frequency mixer Mix receives the frequency signal from high band voltage controlled oscillator VCO and fixed oscillator OSC, the two is carried out to mixing, obtain the signal to be filtered mixing with frequency signal and slip frequency signal by high band voltage controlled oscillator VCO and fixed oscillator OSC;
Step S4: low pass filter LPF carries out filtering operation to described signal to be filtered, by filtering with frequency signal of high band voltage controlled oscillator VCO wherein and fixed oscillator OSC, select the slip frequency signal of output high band voltage controlled oscillator VCO and fixed oscillator OSC, complete the implementation procedure of super wide octave VCO.
As shown in Figure 3, illustrating for said process.
Wherein, f
vfor the signal of VCO is exported corresponding frequency, f
cfor the signal of OSC is exported corresponding frequency, t is the time.
First, outside input variable voltage source V
tto VCO, VCO output Cos2 Π f
vt to Mix, the Cos2 of OSC output simultaneously Π f
ct to Mix, after Mix mixing output by high band voltage controlled oscillator VCO and fixed oscillator OSC with frequency signal Cos2 Π (f
v+ f
c) t and slip frequency signal Cos2 Π (f
v-f
c) signal to be filtered that mixes of t, last LPF filters the (f with frequency signal Cos2 Π
v+ f
c) t, an output difference frequency signal Cos2 Π (f
v-f
c) t.
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Embodiment
The VCO of the super wide octave that the design frequency scope of take is 0.1GHz～2GHz analyzes as example, specifically implements required each several part as follows:
1. the frequency range of choosing high band VCO is 2GHz～4GHz, and it is 0.56nH that rough calculation can obtain fixed value inductance, and corresponding capacitance variations scope is 2.83pF～1.26pF;
2. choose the fixed oscillator of 2GHz;
3. mixing and filtering obtain the frequency output of 0.1GHz～2GHz.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, do not departing under the prerequisite of the technology of the present invention principle; can also make some improvement and distortion, these improvement and distortion also should be considered as protection scope of the present invention.
Claims (1)
1. the implementation method of a super wide octave VCO, it is characterized in that, described method is implemented based on super wide octave voltage controlled oscillator, described super wide octave voltage controlled oscillator comprises: high band voltage controlled oscillator (VCO), fixed oscillator (OSC), frequency mixer (Mix) and low pass filter (LPF);
The implementation method of described super wide octave VCO specifically comprises the steps:
Step S1: outside input variable voltage source V
tparamount frequency range voltage controlled oscillator (VCO), controls the variable capacitance in high band voltage controlled oscillator (VCO) resonant tank, realizes voltage-frequency conversion, and high band voltage controlled oscillator (VCO) obtains corresponding frequency f
vand output;
Step S2: fixed oscillator (OSC), according to the desired frequency output area of super wide octave voltage controlled oscillator and the intrinsic frequency-tuning range of high band voltage controlled oscillator (VCO), is determined default fixed frequency signal f
cand output;
Step S3: frequency mixer (Mix) receives the frequency signal from high band voltage controlled oscillator (VCO) and fixed oscillator (OSC), the two is carried out to mixing, obtain the signal to be filtered mixing with frequency signal and slip frequency signal by high band voltage controlled oscillator (VCO) and fixed oscillator (OSC);
Step S4: low pass filter (LPF) carries out filtering operation to described signal to be filtered, by filtering with frequency signal of high band voltage controlled oscillator (VCO) wherein and fixed oscillator (OSC), select the slip frequency signal of output high band voltage controlled oscillator (VCO) and fixed oscillator (OSC), complete the implementation procedure of super wide octave VCO.
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| CN201310607858.XA CN103618546A (en) | 2013-11-27 | 2013-11-27 | Ultra wide octave voltage-controlled oscillation realizing method |
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| CN201310607858.XA CN103618546A (en) | 2013-11-27 | 2013-11-27 | Ultra wide octave voltage-controlled oscillation realizing method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107505830A (en) * | 2017-08-31 | 2017-12-22 | 安徽四创电子股份有限公司 | A kind of microwave signal Hopping time measuring circuit |
| CN112187179A (en) * | 2020-09-29 | 2021-01-05 | 西安博瑞集信电子科技有限公司 | Single-subband voltage-controlled oscillator with wide frequency range |
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|---|---|---|---|---|
| CN1091230A (en) * | 1993-02-20 | 1994-08-24 | 机械电子工业部第四十一研究所 | The unfavourable balance frequency synthesis method of ultra broadband voltage tuned oscillator |
| CN1505272A (en) * | 2002-12-03 | 2004-06-16 | ���ǵ�����ʽ���� | Device for generating wide tunable frequency using frequency divider |
| CN1723608A (en) * | 2002-08-27 | 2006-01-18 | 皇家飞利浦电子股份有限公司 | Multiple band local oscillator frequency generation circuit |
| CN1777260A (en) * | 2004-11-19 | 2006-05-24 | 松下电器产业株式会社 | Sound intermediate frequency conversion circuit |
| US20070025479A1 (en) * | 2005-07-29 | 2007-02-01 | Erik Anderson | GPS front end with universal digital interface |
-
2013
- 2013-11-27 CN CN201310607858.XA patent/CN103618546A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1091230A (en) * | 1993-02-20 | 1994-08-24 | 机械电子工业部第四十一研究所 | The unfavourable balance frequency synthesis method of ultra broadband voltage tuned oscillator |
| CN1723608A (en) * | 2002-08-27 | 2006-01-18 | 皇家飞利浦电子股份有限公司 | Multiple band local oscillator frequency generation circuit |
| CN1505272A (en) * | 2002-12-03 | 2004-06-16 | ���ǵ�����ʽ���� | Device for generating wide tunable frequency using frequency divider |
| CN1777260A (en) * | 2004-11-19 | 2006-05-24 | 松下电器产业株式会社 | Sound intermediate frequency conversion circuit |
| US20070025479A1 (en) * | 2005-07-29 | 2007-02-01 | Erik Anderson | GPS front end with universal digital interface |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107505830A (en) * | 2017-08-31 | 2017-12-22 | 安徽四创电子股份有限公司 | A kind of microwave signal Hopping time measuring circuit |
| CN112187179A (en) * | 2020-09-29 | 2021-01-05 | 西安博瑞集信电子科技有限公司 | Single-subband voltage-controlled oscillator with wide frequency range |
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Application publication date: 20140305 |