CN217770031U - Temperature compensation LC voltage-controlled oscillator - Google Patents
Temperature compensation LC voltage-controlled oscillator Download PDFInfo
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- CN217770031U CN217770031U CN202121985089.3U CN202121985089U CN217770031U CN 217770031 U CN217770031 U CN 217770031U CN 202121985089 U CN202121985089 U CN 202121985089U CN 217770031 U CN217770031 U CN 217770031U
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Abstract
The utility model discloses a temperature compensation LC voltage controlled oscillator, including LC tank circuit and cross coupling active module, LC tank circuit includes that inductance, positive power source bulldoze main capacitance diode circuit, positive power source bulldoze temperature compensation varactor diode circuit and coarse tuning capacitor bank, and cross coupling active module, inductance, main capacitance diode circuit, temperature compensation varactor diode circuit and coarse tuning capacitor bank parallel coupling are between two outputs to voltage controlled oscillator. The utility model discloses main electric capacity diode circuit and/or temperature compensation varactor circuit provide positive power and bulldoze, can obtain certain transconductance with lower electric current, reach the purpose that reduces the consumption.
Description
[ technical field ]
The utility model relates to a voltage controlled oscillator especially relates to a temperature compensation LC voltage controlled oscillator.
[ background Art ]
The voltage-controlled oscillator is an oscillating circuit (VCO) having a corresponding relationship between an output frequency and an input control voltage, the frequency of the oscillator VCO is a function of the input signal voltage, and the operating state of the oscillator or the parameters of the elements of the oscillating circuit are controlled by the input control voltage to form a voltage-controlled oscillator.
The invention with the application number of CN201280011530.5 discloses a temperature compensation and coarse tuning block switch in a low-phase noise VCO, wherein an LC oscillation circuit of the VCO comprises a main capacitance diode circuit and a temperature compensation varactor circuit coupled with the main capacitance diode circuit in parallel. The main varactor circuit is used for fine tuning. The temperature compensating varactor circuit has a capacitance-voltage characteristic that is different from the capacitance-voltage characteristic of the main varactor circuit such that the effect of common mode noise across the two varactor circuits is minimized. The LC tank also has a plurality of switchable capacitor circuits set to coarse tuning. To prevent breakdown of the main thin oxide switch in each switchable capacitor circuit, each switchable capacitor circuit has a capacitive voltage divider circuit that reduces the voltage across the main thin oxide when the main switch is turned off.
The grid electrode and the source electrode/drain electrode of the temperature compensation variable capacitance diode circuit are reversely connected, so that the capacitance-voltage characteristic of the temperature compensation variable capacitance diode circuit and the capacitance-voltage characteristic of the main variable capacitance diode circuit are in a reverse relation, equivalently, the temperature compensation variable capacitance diode circuit provides positive power supply push, and the contribution of power supply noise is offset. However, this approach only compensates for the power supply push of the main varactor circuit and does not take into account the overall power supply push of the entire VCO. The power consumption cannot be further reduced.
[ summary of the invention ]
The to-be-solved technical problem of the utility model is to provide a lower temperature compensation LC voltage controlled oscillator of consumption.
In order to solve the technical problem, the utility model discloses a technical scheme be, a temperature compensation LC voltage controlled oscillator, including LC tank and cross coupling active module, LC tank includes inductance, the main varactor circuit that positive power source bulldozed, the temperature compensation varactor circuit that positive power source bulldozed and coarse tuning capacitor bank, and cross coupling active module, inductance, main varactor circuit, temperature compensation varactor circuit and coarse tuning capacitor bank are between two outputs of parallel coupling to voltage controlled oscillator.
In the LC voltage-controlled oscillator with temperature compensation, the main varactor diode circuit comprises a first diode, a second diode, a first capacitor, a second capacitor, a first resistor and a second resistor, wherein the anode of the first diode is connected with the anode of the second diode and connected with the voltage signal input end of the voltage-controlled oscillator; the cathode of the first diode is connected with a first parallel coupling end of the main capacitance-variable diode circuit through a first capacitor, and the cathode of the second diode is connected with a second parallel coupling end of the main capacitance-variable diode circuit through a second capacitor; the first end of the first resistor is connected with the cathode of the first diode, and the first end of the second resistor is connected with the cathode of the second diode; the second end of the first resistor and the second end of the second resistor are connected with each other and connected with the input end of the bias supply voltage of the main capacitance diode.
In the temperature compensation LC voltage-controlled oscillator, the temperature compensation varactor diode circuit includes a third diode, a fourth diode, a third capacitor, a fourth capacitor, a third resistor, and a fourth resistor, an anode of the third diode and an anode of the fourth diode are connected to each other and connected to an input terminal of a temperature compensation voltage signal; the cathode of the third diode is connected with the first parallel coupling end of the temperature compensation variable capacitance diode circuit through a third capacitor, and the cathode of the fourth diode is connected with the second parallel coupling end of the temperature compensation variable capacitance diode circuit through a fourth capacitor; the first end of the third resistor is connected with the cathode of the third diode, and the first end of the fourth resistor is connected with the cathode of the fourth diode; and the second end of the third resistor and the second end of the fourth resistor are mutually connected and are connected with the input end of the compensation variable capacitance diode bias supply voltage.
The temperature compensation LC voltage-controlled oscillator comprises a temperature compensation voltage signal output circuit, wherein the temperature compensation voltage signal output circuit comprises a PTAT current source, the anode of the PTAT current source is connected with the power voltage through a seventh resistor, the cathode of the PTAT current source is grounded, and the anode of the PTAT current source is the input end of the temperature compensation voltage signal.
The temperature compensation LC voltage-controlled oscillator, the temperature compensation varactor circuit includes a bias power supply circuit of the main varactor, the bias power supply circuit includes a fifth resistor and a sixth resistorThe first end of the fifth resistor is connected with the power supply voltage, the second end of the fifth resistor is connected with the first end of the sixth resistor, and the second end of the sixth resistor is grounded; the second end of the fifth resistor is used as the input end of the bias voltage supply voltage of the compensation variable capacitance diode, the output impedance of the PTAT current source is R, and the resistance value of the fifth resistor is R 5 The resistance value of the sixth resistor is R 6 The resistance value of the seventh resistor is R 7 ,[R 6 /(R 5 +R 6 )]>[R/(R 7 +R)]。
In the LC voltage-controlled oscillator with temperature compensation, the coarse tuning capacitor bank is a switchable capacitor array, the switchable capacitor array includes a plurality of switchable capacitor unit circuits connected in parallel and a switching circuit, and the switching circuit includes a switching signal input end.
In the temperature compensation LC voltage-controlled oscillator, the switchable capacitor unit circuit includes a switching tube, a fifth capacitor, a sixth capacitor, an eighth resistor and a ninth resistor, a first end of the fifth capacitor is connected to a first end of the sixth capacitor through the switching tube, and a control end of the switching tube is connected to an input end of the control voltage; the second end of the fifth capacitor is connected with the first parallel coupling end of the coarse tuning capacitor bank, and the second end of the sixth capacitor is connected with the second parallel coupling end of the coarse tuning capacitor bank; the first end of the eighth resistor is connected with the first end of the fifth capacitor, and the first end of the ninth resistor is connected with the first end of the sixth capacitor; the second end of the eighth resistor and the second end of the ninth resistor are connected to each other and coupled to an input terminal of a bias supply voltage.
In the LC voltage-controlled oscillator with temperature compensation, the switching tube is an MOS tube, and a gate of the MOS tube is connected to the control voltage input terminal.
In the temperature compensation LC voltage-controlled oscillator, the cross-coupling active module is an NMOS and PMOS cross-coupled transistor structure.
The utility model discloses temperature compensation LC voltage controlled oscillator's main varactor diode circuit and/or temperature compensation varactor diode circuit provide positive power and bulldoze, can obtain certain transconductance with lower electric current, reach the purpose that reduces the consumption.
[ description of the drawings ]
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Fig. 1 is a schematic block diagram of an embodiment of the present invention.
Fig. 2 is a circuit diagram of the LC voltage-controlled oscillator with temperature compensation according to an embodiment of the present invention.
Fig. 3 is a circuit diagram of a cross-coupled active module according to an embodiment of the present invention.
Fig. 4 is a schematic diagram of a switchable capacitor array according to an embodiment of the present invention.
Fig. 5 is a circuit diagram of a switchable capacitor cell circuit according to an embodiment of the present invention.
[ detailed description of the invention ]
The embodiment of the utility model provides a temperature compensation LC voltage controlled oscillator's structure and principle are shown as figure 1 to figure 5, including LC tank and cross coupling active module (negative resistance circuit), LC tank (LC resonant cavity) is including inductance L, main varactor circuit, temperature compensation varactor circuit, changeable capacitance array (coarse tuning capacitor group) C SCA Voltage signal input terminal V CTRL And two output terminals V OP And V ON . When V is input from the voltage signal input terminal CTRL The voltage changes, and the capacitance value of the main capacitance diode circuit also changes, so that the output signal V is output OP And V ON Changes accordingly.
Cross coupling active module (negative resistance circuit), inductance L, main varactor circuit, temperature compensation varactor circuit and switchable capacitor array C SCA Two output terminals V coupled in parallel to a voltage controlled oscillator OP And V ON In between. The cross-coupled active module (negative resistance circuit) provides negative resistance to compensate the positive resistance in the LC resonant cavity (inductor, switchable capacitor array, main varactor circuit, and temperature compensation varactor circuit) to make the output V of the voltage controlled oscillator OP And V ON A signal with a frequency of 1/2 π/√ (LC) is generated.
As shown in FIG. 2, the main varactor circuit includes a first diode D 1 A second diode D 2 A first capacitor C 1 A second capacitorC 2 A first resistor R 1 And a second resistor R 2 The anode of the first diode D1 and the anode of the second diode D2 are connected with each other and connected with the voltage signal input end V of the voltage-controlled oscillator CTRL . First diode D 1 Through a first capacitor C 1 A first parallel coupling end connected with the main varactor diode circuit and a second diode D 2 Through a second capacitor C 2 And is connected with the second parallel coupling end of the main varactor circuit. A first resistor R 1 First terminal of (D) is connected with a first diode D 1 A cathode of (2), a second resistor R 2 First end of the second diode D 2 The cathode of (1). A first resistor R 1 Second terminal and second resistor R 2 Is connected with each other and is connected with an input end V of a main capacitance diode bias voltage supply voltage in parallel BIAS1 。
As shown in fig. 2, the temperature compensated varactor circuit includes a third diode D 3 A fourth diode D 4 A third capacitor C 3 A fourth capacitor C 4 A third resistor R 3 And a fourth resistor R 4 A third diode D 3 Anode of (2) and a fourth diode D 4 Are connected with each other and connected with the input end V of the temperature compensation voltage signal CTAT . The cathode of the third diode D3 passes through the third capacitor C 3 A fourth diode D connected with the first parallel coupling end of the temperature compensation variable capacitance diode circuit 4 Through a fourth capacitor C 4 And the second parallel coupling end of the temperature compensation variable capacitance diode circuit is connected. Third resistor R 3 First end of the first diode D is connected with a third diode D 3 A fourth resistor R 4 First end of the fourth diode D 4 The cathode of (2). Third resistor R 3 Second terminal and fourth resistor R 4 Are connected to each other and are connected in parallel to compensate the input terminal V of the varactor bias supply voltage BIAS2 。
As shown in FIG. 2, the temperature compensated voltage signal output circuit includes a PTAT current source I PTAT PTAT current source I PTAT Through a seventh resistor R 7 A PTAT current source I connected with the power supply voltage and the negative electrode thereof is grounded PTAT Positive electrode of (2) is temperatureAnd the input end of the temperature compensation voltage signal of the compensation variable capacitance diode circuit.
As shown in FIG. 2, the temperature compensation varactor circuit comprises a bias voltage supply circuit of a main varactor, and the bias voltage supply circuit comprises a fifth resistor and a sixth resistor R 6 The fifth resistor R of the voltage division circuit 5 First end connected to the power supply voltage V DD Fifth resistance R 5 Second end of the sixth resistor R 6 A first terminal of (1), a sixth resistor R 6 The second terminal of (1) is grounded; fifth resistor R 5 As an input terminal V for said compensation varactor bias supply voltage BIAS2 PTAT current source I PTAT Has an output impedance of R, and has a resistance value of R 5 The resistance value of the sixth resistor is R 6 The resistance value of the seventh resistor is R 7 . A fifth resistor and a sixth resistor R 6 Has a resistance value of [ R ] 6 /(R 5 +R 6 )]>[R/(R 7 +R)]。
As shown in FIG. 3, the cross-coupled active module includes P MOS transistor M P1 、M P2 And N MOS tube M N1 、M N2 . Wherein, P MOS tube M P1 And M P2 The source electrode of the transistor is connected with a power supply voltage VDD, and an N MOS transistor M N1 And M N2 Is grounded. M P1 ,M N1 Gate of is connected to V ON Drain to V OP ；M P2 ,M N2 Gate of is connected to V OP Drain to V ON And forming a cross pair transistor structure of NMOS and PMOS. The cross-coupled active module generates a negative resistance to form a complementary negative resistance circuit for compensating the resistance in the LC tank. From the perspective of the influence of temperature change on frequency change, the capacitance values of the negative resistance circuit, the switchable capacitor array and the main varactor diode circuit can be increased when the temperature is higher, so that the frequency is reduced. Therefore, a temperature compensation varactor circuit is needed, so that the capacitance value of the varactor circuit can be reduced along with the temperature rise, and the equivalent capacitance of the whole resonant cavity is not changed along with the temperature. As shown in FIG. 2, V BIAS2 Is a reference voltage V which does not rise with or with temperature CTAT Is a reference voltage that decreases with increasing temperature, the product of whichThe resulting way is to sink the PTAT current to the resistance to the power supply. This implementation is simple because the PTAT current source is easily generated by a common bandgap reference or a fixed transconductance (constant-gm) circuit.
As shown in FIG. 4, a switchable capacitor array C SCA Comprising a plurality of switchable capacitive cell circuits and switching circuits connected in parallel. The switching circuit comprises an input terminal CAP [ N:0 ] of a switching signal]。
The switchable capacitor unit circuit comprises a MOS transistor M n ， 1 A fifth capacitor C SW1 And a sixth capacitor C SW2 An eighth resistor R 8 And a ninth resistor R 9 Fifth capacitor C SW1 First terminal of (2) and sixth capacitor C SW2 First end of the MOS transistor M n ， 1 Source and drain electrodes of MOS transistor M are connected n ， 1 Is connected with a control voltage V C To the input terminal of (1). Fifth capacitance C SW1 Second terminal of the capacitor is connected with a switchable capacitor array C SCA A sixth capacitor C SW2 Second terminal of the capacitor is connected with a switchable capacitor array C SCA And a second parallel coupled terminal. Eighth resistor R 8 Is connected to a fifth capacitor C SW1 A first terminal of (1), a ninth resistor R 9 First terminal of the sixth capacitor C SW2 The first end of (a). Eighth resistor R 8 Second terminal and a ninth resistor R 9 Are connected to each other and are connected in parallel to an input terminal V of a bias supply voltage BIAS1 . C in FIG. 5 P1 And C P2 Is a parasitic (stray) capacitance.
As shown in FIG. 5, CAP [ N:0 ]]Is a digital signal input end connected with a serial bus interface and an MOS tube M n ， 1 Gate control voltage V of C Is a digital signal CAP [ N:0]And (4) controlling. By controlling MOS transistor M n ， 1 Gate control voltage V of C An input digital signal CAP [ N:0 ]]Make the switchable capacitor array C SCA The switchable capacitor unit circuit can be selectively connected into or disconnected from the LC oscillating circuit, and the total capacitance of the LC oscillating circuit can be increased by increasing the number of the switchable capacitor units, so that the output frequency of the LC voltage-controlled oscillator is reduced; disconnecting switchable capacitor unitThe element can reduce the total capacitance of the LC oscillating circuit, thereby increasing the output frequency of the LC voltage-controlled oscillator.
Supply boosting KVDD is the influence coefficient of the change of the power Supply voltage on the output frequency of the voltage-controlled oscillator. If the supply voltage VDD rises to raise the output frequency of the voltage controlled oscillator, K VDD Is a positive value; if the power supply voltage VDD rises and the output frequency of the voltage controlled oscillator falls, then K VDD Is negative.
Following to the utility model discloses power of each module circuit bulldozes (Supply pushing) K VDD The analysis is carried out and the analysis is carried out,
as shown in FIG. 3, if the power supply voltage VDD rises, the negative resistance circuit M N1 ,M N2 ,M P1 ,M P2 Parasitic junction capacitance C of the gate P1 ,C P2 The power supply voltage rises due to the rise of the power supply voltage, so that the equivalent capacitance of the overall negative resistance circuit increases, and the frequency decreases.
The structure of the switchable capacitor array is shown in fig. 4, which is composed of a plurality of switchable capacitor unit circuits shown in fig. 5 connected in parallel, so that power push for the array can be discussed with respect to one switchable capacitor unit circuit.
When the switchable capacitive cell circuit is on, i.e. V BIAS1 ＝0,V C ＝VDD,M n1 The equivalent parasitic capacitance of the gate-source and the gate-drain of the transistor increases with the rise of the power supply voltage;
when the switchable capacitive cell circuit is switched off, i.e. V BIAS1 ＝VDD,V C ＝0,M n1 Parasitic Junction Capacitance (Parasitic Junction Capacitance) C of source to ground and drain to ground P1 ,C P2 The capacitance of the switchable capacitor array is increased along with the increase of the power voltage, and the overall capacitance of the switchable capacitor array is increased along with the increase of the power voltage, so that the power push of the switchable capacitor array is a negative value.
Discussed below the utility model discloses the power of main varactor diode circuit bulldozes. As shown in figure 2 of the drawings, in which,e.g. supply voltage V DD Rising, due to the integration of a voltage controlled oscillator into the phase locked loop, V CTRL Locked by the whole phase-locked loop, but V is caused to be constant BIAS1 And (4) rising. As can be seen from the capacitance-voltage characteristics of the varactor, the equivalent capacitance decreases as the cathode voltage increases without changing the anode voltage of the varactor. Therefore, the power voltage rises, the equivalent capacitance of the main varactor circuit will drop, so that the frequency rises, and the power of the main varactor circuit is pushed to a positive value.
As shown in fig. 2, the power supply push analysis of the temperature compensation varactor circuit according to an embodiment of the present invention is as follows.
V CTAT Generated by supplying PTAT current to the power supply V DD On the resistor, e.g. the supply voltage rises, causing V CTAT And V BIAS2 Rise, but because of the fifth and sixth resistors R 6 Has a resistance value of [ R ] 6 /(R 5 +R 6 )]>[R/(R 7 +R)]Therefore V is DD [R 6 /(R 5 +R 6 )]>V DD [R/(R 7 +R)]To allow the power supply of the temperature compensation varactor circuit to push K VDD At a positive value, V may be set to BIAS2 The more that rises, the electric capacity that makes equivalent main varactor circuit descends, and the frequency rises, so the utility model discloses temperature compensation varactor circuit's power bulldozes K VDD A positive value.
Power supply push K from integral voltage controlled oscillator VDD In view of the action of, K VDD The smaller the absolute value of (c), the smaller the influence on the power supply noise. Thus, in addition to modules containing varactor circuits, there is an opportunity for K to be VDD Positive values, the remaining modules K VDD Are both negative. Therefore, the structure of the embodiment of the utility model makes the main varactor circuit and the temperature compensation varactor circuit all provide positive K VDD So as to make the negative resistance K VDD Amplifies the absolute value of (a). For the same negative resistance requirement, because of the negative resistance size and transconductance (g) m ) In direct proportion, g m = √ (K (W/L) I), so the same g m The (W/L) of the negative resistance NMOS/PMOS can be amplified, the current can be reduced to meet the requirement, and the negative resistance NMOS/PMOS can not be subjected toWhich has an effect on power supply noise.
Table 1: low-power consumption temperature compensation LC voltage-controlled oscillator simulation data table
According to the simulation result of the upper table, the utility model discloses a low-power consumption temperature compensation VCO can make temperature variation follow-45 ℃ to 125 ℃, and its frequency variation is less than 0.03%, because the utility model discloses it is positive to make main capacitance power bulldoze and temperature compensation power bulldoze, so can make negative resistance power bulldoze and reach-131.1 MHz/V to-105.5 MHz/V, and do not influence whole phase noise, when 3 GHz's oscillation frequency, the consumption electric current is only 300uA.
The utility model discloses above embodiment has following advantage:
1. traditional LCVCO, the power of changeable capacitor circuit and negative resistance circuit bulldozes and all is the burden, the utility model discloses above embodiment all provides positive power with main varactor diode circuit and temperature compensation varactor diode circuit and bulldozes, so can amplify the NMOS/PMOS of negative resistance circuit (W/L), keep the same whole power to bulldoze, power noise just does not influence whole phase noise, and by the size of enlargiing negative resistance circuit, can go to obtain the same transconductance with lower current moreover, the event can reach the purpose that reduces the consumption.
2. From the third item of the simulation results, if the main varactor circuit adopts the circuit of utility model with application number CN201280011530.5, the whole power source push-press will become-94.69 MHz/V to-67.52 MHz/V, compared with the above embodiments of the present invention VDD Is more than three times larger than the absolute value of (a), the equivalent result is more than three times larger the influence of power supply noise.
3. If the utility model with application number of CN201280011530.5 is adopted, the same phase noise characteristic as the above embodiments of the present invention is maintained, and the negative resistance circuit NMOS/PMOS (M) can only be reduced P1 ,M P2 ,M N1 ,M N2 ) The (W/L) of (a) increases the power consumption of the LC voltage-controlled oscillator.
Claims (9)
1. A temperature compensation LC voltage-controlled oscillator comprises an LC oscillating circuit and a cross coupling active module, wherein the LC oscillating circuit comprises an inductor, a main capacitance diode circuit, a temperature compensation variable capacitance diode circuit and a coarse tuning capacitor bank, and the cross coupling active module, the inductor, the main capacitance diode circuit, the temperature compensation variable capacitance diode circuit and the coarse tuning capacitor bank are coupled between two output ends of the voltage-controlled oscillator in parallel.
2. The temperature-compensated LC vco of claim 1, wherein the main varactor diode circuit comprises a first diode, a second diode, a first capacitor, a second capacitor, a first resistor, and a second resistor, an anode of the first diode and an anode of the second diode are connected to each other and connected to the voltage signal input terminal of the vco; the cathode of the first diode is connected with a first parallel coupling end of the main capacitance-variable diode circuit through a first capacitor, and the cathode of the second diode is connected with a second parallel coupling end of the main capacitance-variable diode circuit through a second capacitor; the first end of the first resistor is connected with the cathode of the first diode, and the first end of the second resistor is connected with the cathode of the second diode; the second end of the first resistor and the second end of the second resistor are connected with each other and connected with the input end of the bias supply voltage of the main capacitance diode.
3. The temperature-compensated LC voltage-controlled oscillator of claim 1, wherein the temperature-compensated varactor circuit comprises a third diode, a fourth diode, a third capacitor, a fourth capacitor, a third resistor, and a fourth resistor, an anode of the third diode and an anode of the fourth diode are connected to each other and connected to an input terminal of the temperature-compensated voltage signal; the cathode of the third diode is connected with the first parallel coupling end of the temperature compensation variable capacitance diode circuit through a third capacitor, and the cathode of the fourth diode is connected with the second parallel coupling end of the temperature compensation variable capacitance diode circuit through a fourth capacitor; the first end of the third resistor is connected with the cathode of the third diode, and the first end of the fourth resistor is connected with the cathode of the fourth diode; and the second end of the third resistor and the second end of the fourth resistor are connected with each other and are connected with the input end of the bias supply voltage of the compensation variable capacitance diode.
4. The temperature compensated LC voltage controlled oscillator of claim 3, comprising a temperature compensated voltage signal output circuit comprising a PTAT current source having an anode connected to the power supply voltage through a seventh resistor and a cathode connected to ground, wherein the anode of the PTAT current source is the input of the temperature compensated voltage signal.
5. The temperature-compensated LC voltage-controlled oscillator of claim 4, wherein the temperature-compensated varactor circuit comprises a bias supply circuit for a main varactor, the bias supply circuit comprising a fifth resistor and a sixth resistor, a first terminal of the fifth resistor being connected to the supply voltage, a second terminal of the fifth resistor being connected to a first terminal of the sixth resistor, and a second terminal of the sixth resistor being connected to ground; the second end of the fifth resistor is used as the input end of the bias voltage supply voltage of the compensation variable capacitance diode, the output impedance of the PTAT current source is R, and the resistance value of the fifth resistor is R 5 The resistance value of the sixth resistor is R 6 The resistance value of the seventh resistor is R 7 , [R 6 /(R 5 +R 6 )]> [R/(R 7 +R)]。
6. The temperature-compensated LC vco of claim 1, wherein the coarse tuning capacitor bank is a switchable capacitor array comprising a plurality of switchable capacitor cell circuits connected in parallel and control signal inputs for switching the switchable capacitor cell circuits.
7. The temperature-compensated LC voltage-controlled oscillator as claimed in claim 6, wherein the switchable capacitor unit circuit comprises a switching tube, a fifth capacitor, a sixth capacitor, an eighth resistor and a ninth resistor, a first end of the fifth capacitor is connected with a first end of the sixth capacitor through the switching tube, and a control end of the switching tube is connected with an input end of the control voltage; the second end of the fifth capacitor is connected with the first parallel coupling end of the coarse tuning capacitor bank, and the second end of the sixth capacitor is connected with the second parallel coupling end of the coarse tuning capacitor bank; the first end of the eighth resistor is connected with the first end of the fifth capacitor, and the first end of the ninth resistor is connected with the first end of the sixth capacitor; the second end of the eighth resistor and the second end of the ninth resistor are connected with each other and connected with the input end of the bias supply voltage in parallel.
8. The temperature-compensated LC voltage-controlled oscillator according to claim 7, wherein the switching transistor is an MOS transistor, and a gate of the MOS transistor is connected to the control voltage input terminal.
9. The temperature-compensated LC voltage-controlled oscillator of claim 1, wherein the cross-coupled active modules are NMOS and PMOS cross-pair transistor structures.
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| CN202121985089.3U CN217770031U (en) | 2021-08-23 | 2021-08-23 | Temperature compensation LC voltage-controlled oscillator |
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| CN202121985089.3U CN217770031U (en) | 2021-08-23 | 2021-08-23 | Temperature compensation LC voltage-controlled oscillator |
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