CN103580607A - Voltage-controlled oscillator circuit - Google Patents
Voltage-controlled oscillator circuit Download PDFInfo
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- CN103580607A CN103580607A CN201310569063.4A CN201310569063A CN103580607A CN 103580607 A CN103580607 A CN 103580607A CN 201310569063 A CN201310569063 A CN 201310569063A CN 103580607 A CN103580607 A CN 103580607A
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Abstract
The invention provides a voltage-controlled oscillator circuit which has the voltage proportion scaling function. The voltage-controlled oscillator circuit can scale the input voltage proportionally to reduce the tuning curve gain of a voltage-controlled oscillator. The voltage-controlled oscillator circuit is mainly composed of a voltage proportion scaling part 1, a current injection part 2 and a voltage-controlled oscillator part 3. The voltage proportion scaling part 1 is mainly composed of a unit gain voltage buffer, a resistor R1 and a resistor R2. The current injection part is mainly composed of a current source I1, a current source I2, ...a current source IN which are independent and are connected in parallel. The voltage-controlled oscillator part is mainly composed of an LC type voltage-controlled oscillator.
Description
Technical field
The present invention relates to electronic technology field, for receiver provides the voltage controlled oscillator of low tuning curve gain, can apply Direct Conversion Receiver, superheterodyne receiver, heterodyne receiver etc., be particularly useful for the occasion that linear voltage control range is higher and low phase noise is had relatively high expectations.
Background technology
Along with the communication technology, especially the develop rapidly of mobile communication technology and computing technique, the voltage controlled oscillator with wide linear voltage control range and ground phase noise has become one of the study hotspot in Circuits and Systems field, and it mainly has wide control reference voltage, low tuning curve gain, low phase noise, volume is little, low in energy consumption, reliability is high and low cost and other advantages.Voltage controlled oscillator is called for short VCO, and its self-resonance produces frequency signal, for frequency synthesizer provides frequency synthesis signal, for frequency mixer provides local oscillated signal.。
The application of voltage controlled oscillator is very extensive, is mainly used in frequency synthesizer and carries out frequency synthesis accurately, can also produce local oscillated signal for frequency mixer.
Voltage controlled oscillator has been invented very early.This voltage controlled frequency produce circuit successfully solved radio communication without many difficult problems.In particularly between more than 70 year after Armstrong active development super-heterodyne structural receiver, clock occupies this dominant position.Be subject in the last few years the particularly fast development of integrated circuit of electronics industry, and required cheaply to make the receiver structure of Direct Conversion structure become main flow.
In these two kinds of receiver structures, capacitor array voltage controlled oscillator is modal structure (SCA frequency mixer), as shown in Figure 1, comprise current source Ib, metal-oxide-semiconductor M1, M2, M3, M4, inductance L, capacitor array C1a, C2a ... Cna, C1b, C2b ... Cnb.Current source Ib is connected between node VDD and node 3.The grid terminated nodes 2 of M1 is connected, and drain terminal is connected with node 3, and source is connected to the ground; The grid terminated nodes 1 of M2 is connected, and drain terminal is connected with node 2, and source is connected to the ground; The grid terminated nodes 2 of M3 is connected, and drain terminal is connected with node 1, and source is connected with node 5; The grid terminated nodes 1 of M4 is connected, and drain terminal is connected with node 2, and source is connected with node 3.Two outputs of inductance L are connected with node 2 with node 1 respectively; Capacitor array parcel C1a, C2a ... Cna, C1b, C2b ... the 2N such as a Cnb electric capacity, N is greater than or equal to 0 integer.Capacitor C 1a, C2a ... a node of Can is connected with node 1, and another node is connected with node VTUNE; C1b, C2ba ... a node of Cnb is connected with node 2, and another node is connected with node VTUNE.Capacitor C 1a, C2a ... Cna, C1b, C2b ... Cnb is controlled by the individual independently switch of N, and wherein the control switch of C1a and C1b is that S1 controls; The control switch of C2a and C2b is that S2 controls; The control switch of Cna and Cnb is that Sn controls.The tuning curve gain constrained of this frequency mixer, because when control voltage VTUNE changes greatly, changed also greatly by the capacitance of voltage-controlled electric capacity, this changes greatly the frequency of oscillation of voltage controlled oscillator, finally make frequency of oscillation to controlling the gain of the curve of voltage, the gain of tuning curve is larger.And the gain of larger tuning curve can allow voltage controlled oscillator produce larger phase noise.
Summary of the invention
(1) technical problem that will solve:
In view of this, the object of this invention is to provide the scheme that effectively reduces tuning curve gain and reduce phase noise of voltage controlled oscillator, the Voltage-Controlled oscillation circuit being obtained by this scheme, can effectively reduce tuning curve gain and reduce phase noise of voltage controlled oscillator.
(2) technical scheme
Figure 2 shows that the voltage controlled oscillator with voltage ratio zoom function provided by the invention.This circuit comprises:
Voltage ratio convergent-divergent part 1, comprises voltage buffer BUFFER, resistance R 1 and R2.The input of BUFFER is node VTUNE, and output is connected to node 1.BUFFER can be unit gain voltage buffer, can be also the voltage buffer with certain yield value;
Divider resistance R1 is connected between node 1 and node V_VAR; Divider resistance R2 is connected between node V_VAR and node ground;
Electric current injects part 2, comprises N current source circuit I1, I2 in parallel ... ..IN, N is greater than or equal to 0 integer.Each independently current source have separately the make-and-break control switch of many profits.Each independently current source be connected between node VDD and node V_VAR.The current value of current source can be any, and a kind of current source value from small to large of rational selection is I, 2I ... 2
ni;
Voltage controlled oscillator part 3 is mainly by current source Ib, metal-oxide-semiconductor M1, M2, M3, M4, inductance L, capacitor array C1a, C2a ... Cna, C1b, C2b ... Cnb forms.Current source Ib is connected between node VDD and node 4.The grid terminated nodes 3 of M1 is connected, and drain terminal is connected with node 2, and source is connected to the ground; The grid terminated nodes 2 of M2 is connected, and drain terminal is connected with node 3, and source is connected to the ground; The grid terminated nodes 3 of M3 is connected, and drain terminal is connected with node 2, and source is connected with node 4; The grid terminated nodes 2 of M4 is connected, and drain terminal is connected with node 3, and source is connected with node 4.Two outputs of inductance L are connected with node 3 with node 2 respectively; Capacitor array parcel C1a, C2a ... Cna, C1b, C2b ... the 2N such as a Cnb electric capacity, N is greater than or equal to 0 integer.Capacitor C 1a, C2a ... a node of Can is connected with node 2, and another node is connected with node V_VAR; C1b, C2ba ... a node of Cnb is connected with node 3, and another node is connected with node V_VAR.Capacitor C 1a, C2a ... Cna, C1b, C2b ... Cnb is controlled by the individual independently switch of N, and wherein the control switch of C1a and C1b is that S1 controls; The control switch of C2a and C2b is that S2 controls; The control switch of Cna and Cnb is that Sn controls.
The in the situation that of normal operation, voltage buffer BUFFER can regard a desirable voltage buffer as.The voltage gain of supposing voltage buffer is A, when input voltage is
time, the direct voltage of node V_VAR is:
In above formula, Si represents that electric current injects a part 2 i current source and whether accesses electric current, and electric current is provided.If this current source access electric current, so Si=1; If this current source does not access electric current, so Si=0.Ii represents the current value of i current source.
Rationally adjust the current value that electric current injects part, can make V_VAR do in the control range that is operated in automatically controlled electric capacity of large limit; DC voltage change amount when the current value that choose reasonable electric current injects part can be adjusted arbitrarily electric current and injects part and increase or reduce a stepping and the overlapping ratio of frequency between adjacent two voltage controlled capacitor tuning curves; The value of choose reasonable resistance R 1 and R2, can adjust arbitrarily the gain of pressuring controlling oscillator frequency adjustment curve.
This structure is not subject to the impact of electric current injection unit classifying type, can use P type electric current, can use N line current source, as shown in Figure 3 yet.
It doesn't matter for the types of current sources of this structure and voltage controlled oscillator in addition, so the present invention is also applicable to N-type current source or removes in the structure of current source, as shown in Figure 4 and Figure 5.
Accompanying drawing explanation
The voltage-controlled oscillator circuit that Fig. 1 is traditional;
The voltage controlled oscillator with voltage ratio zoom function that Fig. 2 invents herein;
The voltage controlled oscillator with voltage ratio zoom function that Fig. 3 invents herein;
The voltage controlled oscillator with voltage ratio zoom function that Fig. 4 invents herein;
The voltage controlled oscillator with voltage ratio zoom function that Fig. 5 invents herein.
Claims (4)
1. a voltage controlled oscillator, the voltage-controlled oscillator circuit with voltage ratio zoom function, is characterized in that, this circuit comprises:
Voltage ratio convergent-divergent part 1, comprises voltage buffer BUFFER, resistance R 1 and R2, and the input of BUFFER is node VTUNE, and output is connected to node 1, and BUFFER can be unit gain voltage buffer, can be also the voltage buffer with certain yield value;
Divider resistance R1 is connected between node 1 and node V_VAR; Divider resistance R2 is connected between node V_VAR and node ground;
Electric current injects part 2, comprise N current source circuit I1, I2 in parallel ... ..IN, N is greater than or equal to 0 integer, each independently current source have separately the make-and-break control switch of many profits, each independently current source be connected between node VDD and node V_VAR, the current value of current source can be any, and a kind of current source value from small to large of rational selection is I, 2I ... 2
ni;
Voltage controlled oscillator part 3 is mainly by current source Ib, metal-oxide-semiconductor M1, M2, M3, M4, inductance L, capacitor array C1a, C2a ... Cna, C1b, C2b ... Cnb forms, current source Ib is connected between node VDD and node 4, the grid terminated nodes 3 of M1 is connected, drain terminal is connected with node 2, and source is connected to the ground; The grid terminated nodes 2 of M2 is connected, and drain terminal is connected with node 3, and source is connected to the ground; The grid terminated nodes 3 of M3 is connected, and drain terminal is connected with node 2, and source is connected with node 4; The grid terminated nodes 2 of M4 is connected, and drain terminal is connected with node 3, and source is connected with node 4, and two outputs of inductance L are connected with node 3 with node 2 respectively; Capacitor array parcel C1a, C2a ... Cna, C1b, C2b ... the 2N such as a Cnb electric capacity, N is greater than or equal to 0 integer, capacitor C 1a, C2a ... a node of Can is connected with node 2, and another node is connected with node V_VAR; C1b, C2ba ... a node of Cnb is connected with node 3, and another node is connected with node V_VAR, capacitor C 1a, C2a ... Cna, C1b, C2b ... Cnb is controlled by the individual independently switch of N, and wherein the control switch of C1a and C1b is that S1 controls; The control switch of C2a and C2b is that S2 controls; The control switch of Cna and Cnb is that Sn controls.
2. a kind of voltage controlled oscillator according to claim 1, with the voltage-controlled oscillator circuit of voltage ratio zoom function, its feature is, voltage ratio convergent-divergent part 1.
3. a kind of voltage controlled oscillator according to claim 1, with the voltage-controlled oscillator circuit of voltage ratio zoom function, its feature is, electric current injects part 2.
4. a kind of voltage controlled oscillator according to claim 1, with the voltage-controlled oscillator circuit of voltage ratio zoom function, its feature is, the output area that voltage ratio convergent-divergent part can convergent-divergent input voltage; Electric current injects part can change node.
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| CN201310569063.4A CN103580607A (en) | 2013-11-15 | 2013-11-15 | Voltage-controlled oscillator circuit |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105429625A (en) * | 2014-09-15 | 2016-03-23 | 亚德诺半导体集团 | Methods And Structures To Generate On/Off Keyed Carrier Signals For Signal Isolators |
| CN106330097A (en) * | 2016-08-19 | 2017-01-11 | 西安电子科技大学 | InP HBT voltage-controlled oscillator based on coupled transmission lines |
| US9998301B2 (en) | 2014-11-03 | 2018-06-12 | Analog Devices, Inc. | Signal isolator system with protection for common mode transients |
| US10270630B2 (en) | 2014-09-15 | 2019-04-23 | Analog Devices, Inc. | Demodulation of on-off-key modulated signals in signal isolator systems |
| US10536309B2 (en) | 2014-09-15 | 2020-01-14 | Analog Devices, Inc. | Demodulation of on-off-key modulated signals in signal isolator systems |
-
2013
- 2013-11-15 CN CN201310569063.4A patent/CN103580607A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105429625A (en) * | 2014-09-15 | 2016-03-23 | 亚德诺半导体集团 | Methods And Structures To Generate On/Off Keyed Carrier Signals For Signal Isolators |
| US10270630B2 (en) | 2014-09-15 | 2019-04-23 | Analog Devices, Inc. | Demodulation of on-off-key modulated signals in signal isolator systems |
| US10536309B2 (en) | 2014-09-15 | 2020-01-14 | Analog Devices, Inc. | Demodulation of on-off-key modulated signals in signal isolator systems |
| CN105429625B (en) * | 2014-09-15 | 2020-02-28 | 亚德诺半导体集团 | Method and structure for generating on/off keying carrier signal for signal isolator |
| US9998301B2 (en) | 2014-11-03 | 2018-06-12 | Analog Devices, Inc. | Signal isolator system with protection for common mode transients |
| CN106330097A (en) * | 2016-08-19 | 2017-01-11 | 西安电子科技大学 | InP HBT voltage-controlled oscillator based on coupled transmission lines |
| CN106330097B (en) * | 2016-08-19 | 2019-02-19 | 西安电子科技大学 | InP HBT voltage controlled oscillator based on coupled transmission line |
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Application publication date: 20140212 |