CN116846340A - Voltage-controlled oscillator temperature compensation circuit of phase-locked loop - Google Patents

Voltage-controlled oscillator temperature compensation circuit of phase-locked loop Download PDF

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Publication number
CN116846340A
CN116846340A CN202311101526.4A CN202311101526A CN116846340A CN 116846340 A CN116846340 A CN 116846340A CN 202311101526 A CN202311101526 A CN 202311101526A CN 116846340 A CN116846340 A CN 116846340A
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CN
China
Prior art keywords
voltage
controlled oscillator
control
capacitor
oscillation output
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Pending
Application number
CN202311101526.4A
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Chinese (zh)
Inventor
彭慧耀
陈志阳
许美如
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Xiamen UX High Speed IC Co Ltd
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Xiamen UX High Speed IC Co Ltd
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Priority to CN202311101526.4A priority Critical patent/CN116846340A/en
Publication of CN116846340A publication Critical patent/CN116846340A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
    • H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
    • H03B5/02—Details
    • H03B5/04—Modifications of generator to compensate for variations in physical values, e.g. power supply, load, temperature
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
    • H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
    • H03B5/08—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance
    • H03B5/12—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device
    • H03B5/1206—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device using multiple transistors for amplification
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
    • H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
    • H03B5/08—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance
    • H03B5/12—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device
    • H03B5/1228—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device the amplifier comprising one or more field effect transistors

Abstract

The invention discloses a voltage-controlled oscillator temperature compensation circuit of a phase-locked loop, which comprises a control voltage self-adaptive circuit and a voltage-controlled oscillator with a variable capacitance unit; the temperature lookup table of the control voltage self-adaptive circuit outputs a corresponding digital control voltage signal according to the temperature of the voltage-controlled oscillator, the digital control voltage signal is converted into an analog control voltage signal through the digital-to-analog converter, and the analog control voltage signal is input to the control end of the variable capacitance unit through the control switch circuit to regulate the voltage of the control end of the variable capacitance unit to a voltage value corresponding to the temperature of the voltage-controlled oscillator. The invention can carry out self-adaptive temperature control on the voltage of the control end of the variable capacitance unit through the control voltage self-adaptive circuit, thereby effectively reducing the risk of losing lock of the phase-locked loop caused by temperature change.

Description

Voltage-controlled oscillator temperature compensation circuit of phase-locked loop
Technical Field
The present invention relates to the field of electronic communications, and in particular, to a temperature compensation circuit for a voltage-controlled oscillator of a phase-locked loop.
Background
Phase Lock Loop (PLL) is a negative feedback system, where the PLL uses an input signal input from outside to control the oscillation frequency and Phase inside the Loop, so as to achieve automatic tracking of the frequency of the output signal to the frequency of the input signal, and Phase synchronization of the output signal and the Phase of the input signal.
The core component of the phase-locked loop is a Voltage-controlled oscillator (VCO), the existing VCO generally adopts a capacitor array to realize a wider frequency modulation range (namely, the oscillation frequency range of the VCO), and the capacitor array is connected in series between a first oscillation output end and a second oscillation output end of the VCO; in addition, when the input signal changes (such as the frequency and the phase of the input signal change), the voltage-controlled oscillator maintains the oscillation frequency to be dynamically stable (i.e. the phase-locked loop is locked) through the variable capacitance unit, and the variable capacitance unit is connected in series between the first oscillation output end and the second oscillation output end of the voltage-controlled oscillator, and the adjustment mode of the variable capacitance unit is to change the oscillation frequency of the voltage-controlled oscillator by changing the total capacitance of the variable capacitance unit through adjusting the voltage of the control end of the variable capacitance unit.
Since temperature changes change the parameters of parasitic capacitance and inductance inside the voltage-controlled oscillator, temperature changes also change the oscillation frequency of the voltage-controlled oscillator, and at present, the change of the oscillation signal frequency caused by temperature changes is generally compensated by a variable capacitance unit. However, the capacitance change of the variable capacitance unit is limited (the adjustment range of the voltage of the control terminal of the variable capacitance unit is limited), so that when the change of the oscillation signal frequency caused by the temperature change is too large, the variable capacitance unit cannot compensate the change of the oscillation signal frequency caused by the temperature change, and the oscillation frequency of the voltage-controlled oscillator cannot be kept stable dynamically, so that the phase-locked loop is unlocked.
In view of the above-mentioned problems, it is necessary to develop a temperature compensation circuit for a voltage-controlled oscillator of a phase-locked loop, which can effectively reduce the risk of losing lock of the phase-locked loop due to temperature variation.
Disclosure of Invention
The invention aims to provide a voltage-controlled oscillator temperature compensation circuit of a phase-locked loop, which can effectively reduce the risk of losing lock of the phase-locked loop due to temperature change.
In order to achieve the above object, the solution of the present invention is:
a voltage-controlled oscillator temperature compensation circuit of a phase-locked loop comprises a voltage-controlled oscillator and a control voltage self-adaptive circuit; the voltage controlled oscillator has a variable capacitance unit; the control voltage self-adaptive circuit comprises a temperature lookup table, a digital-to-analog converter, a control switch circuit, an input switch circuit and a voltage stabilizing capacitor, wherein the temperature lookup table is connected with the input end of the control switch circuit through the digital-to-analog converter, the output end of the control switch circuit, the output end of the input switch circuit and the first end of the voltage stabilizing capacitor are connected with the control end of the variable capacitance unit, and the second end of the voltage stabilizing capacitor is grounded; the temperature lookup table outputs a corresponding digital control voltage signal according to the temperature of the voltage-controlled oscillator, the digital control voltage signal is converted into an analog control voltage signal through the digital-to-analog converter, and the analog control voltage signal is input to the control end of the variable capacitance unit through the control switch circuit to correspondingly adjust the voltage of the control end of the variable capacitance unit.
The variable capacitance unit is coupled between a first oscillation output terminal and a second oscillation output terminal of the voltage-controlled oscillator.
The variable capacitance unit comprises a first capacitor and a second capacitor, the first end of the first capacitor and the first end of the second capacitor are respectively connected with a first oscillation output end and a second oscillation output end of the voltage-controlled oscillator, and the second end of the first capacitor and the second end of the second capacitor are connected with a control end of the variable capacitance unit.
The voltage-controlled oscillator is also provided with an inductance unit and a capacitance array; the inductance unit is coupled between a first oscillation output end and a second oscillation output end of the voltage-controlled oscillator, and the capacitance array is coupled between the first oscillation output end and the second oscillation output end of the voltage-controlled oscillator and comprises a plurality of capacitance branches connected in parallel.
The inductance unit comprises an oscillation inductance of which two ends are respectively connected with a first oscillation output end and a second oscillation output end of the voltage-controlled oscillator.
The capacitive branch circuit comprises a first branch circuit capacitor, a second branch circuit capacitor and an electronic switch, wherein the first end of the first branch circuit capacitor and the first end of the second branch circuit capacitor are respectively connected with a first oscillation output end and a second oscillation output end of the voltage-controlled oscillator, and the electronic switch is connected in series between the second end of the first branch circuit capacitor and the second end of the second branch circuit capacitor.
The voltage-controlled oscillator also has a negative resistance unit coupled between the first oscillation output terminal and the second oscillation output terminal of the voltage-controlled oscillator.
The negative resistance unit comprises a first PMOS tube, a second PMOS tube, a first NMOS tube, a second NMOS tube and a tail current source, wherein the source electrode of the first PMOS tube and the source electrode of the second PMOS tube are connected with a working power supply, the drain electrode of the first PMOS tube, the drain electrode of the first NMOS tube, the grid electrode of the second PMOS tube and the grid electrode of the second NMOS tube are connected with a first oscillation output end of the voltage-controlled oscillator, the grid electrode of the first PMOS tube, the grid electrode of the first NMOS tube, the drain electrode of the second NMOS tube and the drain electrode of the second NMOS tube are connected with a second oscillation output end of the voltage-controlled oscillator, and the source electrode of the first NMOS tube and the source electrode of the second NMOS tube are grounded through the tail current source.
After the scheme is adopted, the temperature lookup table outputs a corresponding digital control voltage signal according to the temperature of the voltage-controlled oscillator, the digital control voltage signal is converted into an analog control voltage signal through the digital-to-analog converter, the analog control voltage signal is input to the control end of the variable capacitance unit through the control switch circuit to adjust the control end voltage of the variable capacitance unit, so that the self-adaptive temperature control of the control end voltage of the variable capacitance unit is realized, the characteristic that the oscillation frequency of the voltage-controlled oscillator changes along with the temperature is not changed, the change amount of the control end voltage of the variable capacitance unit along with the temperature is directly reduced, and the risk of unlocking of the phase-locked loop due to the temperature change can be effectively reduced.
Drawings
Fig. 1 is a schematic circuit diagram of the present invention.
Description of the reference numerals:
the voltage-controlled oscillator 1 is provided with,
the variable capacitance unit 11, the first capacitance Ca1, the second capacitance Ca2,
a first oscillation output terminal VOL, a second oscillation output terminal VOR,
an inductance unit 12, an oscillating inductance L1,
capacitor array 13, capacitor branch 131, first branch capacitor Cb1, second branch capacitor Cb2, electronic switch S1,
a negative resistance unit 14, a first PMOS tube PM1, a second PMOS tube PM2, a first NMOS tube NM1, a second NMOS tube NM2, a tail current source I1, a working power supply VCC,
the control voltage adaptation circuit 2,
the temperature look-up table 21 is provided,
the digital-to-analog converter 22,
a control switch circuit 23 for controlling the electronic switch K1,
the input switch circuit 24 outputs the electronic switch K2.
Detailed Description
In order to further explain the technical scheme of the invention, the invention is explained in detail by specific examples.
As shown in fig. 1, the invention discloses a voltage-controlled oscillator temperature compensation circuit of a phase-locked loop, which comprises a voltage-controlled oscillator 1 and a control voltage adaptive circuit 2; the voltage controlled oscillator 1 has a variable capacitance unit 11; the control voltage self-adaptive circuit 2 comprises a temperature lookup table 21, a digital-to-analog converter 22, a control switch circuit 23, an input switch circuit 24 and a voltage stabilizing capacitor C0, wherein the temperature lookup table 21 is connected with the input end of the control switch circuit 23 through the digital-to-analog converter 22, the output end of the control switch circuit 23, the output end of the input switch circuit 24 and the first end of the voltage stabilizing capacitor C0 are connected with the control end of the variable capacitor unit 11, the input end of the input switch circuit 24 can be connected with a charge pump, and the second end of the voltage stabilizing capacitor C0 is grounded; the temperature lookup table 21 outputs a corresponding digital control voltage signal according to the temperature of the voltage-controlled oscillator 1, the digital control voltage signal is converted into an analog control voltage signal through the digital-to-analog converter 22, and the analog control voltage signal is input to the control end of the variable capacitance unit 11 through the control switch circuit 23 to correspondingly adjust the voltage of the control end of the variable capacitance unit 11; the voltage stabilizing capacitor C0 is used for maintaining the voltage of the control terminal of the variable capacitance unit 11.
In the embodiment of the present invention, the control switch circuit 23 may employ a control electronic switch K1, and the input switch circuit 24 may employ an output electronic switch K2.
In the embodiment of the present invention, the variable capacitance unit 11 is coupled between the first oscillation output terminal VOL and the second oscillation output terminal VOR of the voltage-controlled oscillator 1. Specifically, the variable capacitance unit 11 includes a first capacitor Ca1 and a second capacitor Ca2, where a first end of the first capacitor Ca1 and a first end of the second capacitor Ca2 are respectively connected to a first oscillating output terminal VOL and a second oscillating output terminal VOR of the voltage-controlled oscillator 1, and a second end of the first capacitor Ca1 and a second end of the second capacitor Ca2 are connected to a control end of the variable capacitance unit 11.
In an embodiment of the invention, the voltage controlled oscillator 1 further has an inductive element 12 and a capacitive array 13; the inductance unit 12 is coupled between the first oscillating output terminal VOL and the second oscillating output terminal VOR of the voltage-controlled oscillator 1, the capacitance array 13 is coupled between the first oscillating output terminal VOL and the second oscillating output terminal VOR of the voltage-controlled oscillator 1, and the capacitance array 13 includes a plurality of parallel capacitance branches 131. Wherein the inductance unit 12 forms an LC oscillating circuit with the capacitance array 13 and the variable capacitance unit 11; the inductance unit 12 may include an oscillating inductance L1 with two ends respectively connected to a first oscillating output terminal VOL and a second oscillating output terminal VOR of the voltage-controlled oscillator 1; the capacitor branch 131 includes a first branch capacitor Cb1, a second branch capacitor Cb2, and an electronic switch S1, wherein a first end of the first branch capacitor Cb1 and a first end of the second branch capacitor Cb2 are respectively connected to a first oscillating output terminal VOL and a second oscillating output terminal VOR of the voltage-controlled oscillator 1, and the electronic switch S1 is serially connected between a second end of the first branch capacitor Cb1 and a second end of the second branch capacitor Cb 2; the phase-locked loop adjusts the total capacitance of the capacitor array 13 by controlling the on-off of the electronic switch S1 of each capacitor branch 131.
In an embodiment of the present invention, the voltage-controlled oscillator 1 further has a negative resistance unit 14, the negative resistance unit 14 is coupled between the first oscillating output VOL and the second oscillating output VOR of the voltage-controlled oscillator 1, and the negative resistance unit 14 is configured to provide a negative resistance. Specifically, the negative resistance unit 14 includes a first PMOS tube PM1, a second PMOS tube PM2, a first NMOS tube NM1, a second NMOS tube NM2, and a tail current source I1, where a source of the first PMOS tube PM1 and a source of the second PMOS tube PM2 are connected to the working power VCC, a drain of the first PMOS tube PM1, a drain of the first NMOS tube NM1, a gate of the second PMOS tube PM2, and a gate of the second NMOS tube NM2 are connected to the first oscillating output terminal VOL of the voltage-controlled oscillator 1, a gate of the first PMOS tube PM1, a gate of the first NMOS tube NM1, a drain of the second PMOS tube PM2, and a drain of the second NMOS tube NM2 are connected to the second oscillating output terminal VOR of the voltage-controlled oscillator 1, and a source of the first NMOS tube NM1 and a source of the second NMOS tube NM2 are grounded through the tail current source I1.
In the embodiment of the present invention, the oscillation frequency of the voltage controlled oscillator 1 satisfies the following formula (1):
wherein F is OSC For the oscillation frequency of the voltage-controlled oscillator 1, L is the total inductance value of the inductance unit 12, C a C is the total capacitance value of the variable capacitance unit 11 b For the total capacitance value of the capacitor array 13, C M Is the total capacitance value, K, of the parasitic capacitance of the negative resistance unit 14 T A temperature change coefficient which is the total capacitance value of the voltage-controlled oscillator 1, T is the temperature of the voltage-controlled oscillator 1;
the total capacitance value of the variable capacitance unit 11 varies with the transformation of both ends of the capacitance device, and the total capacitance value of the variable capacitance unit 11 satisfies the following formula (2):
wherein Ka is a positive proportionality constant, vctrl is the voltage at the control terminal of the variable capacitance unit 11, V 0 Is the direct current voltage of the first oscillation output end VOL and the second oscillation output end VOR of the voltage-controlled oscillator 1, C a0 For variable capacitance unit 11 at vctrl=v 0 Total capacitance value at that time;
as can be seen from the formulas (1) and (2), the oscillation frequency of the voltage-controlled oscillator 1 satisfies the following formula (3):
the working principle of the embodiment of the invention is as follows:
the frequency of the external input signal is F in The voltage-controlled oscillator 1 is at the normal start-up temperature T 0 Starting, when the voltage-controlled oscillator 1 is started, the input switching circuit 24 is opened and the control switching circuit 23 is closed; the temperature lookup table 21 finds that the voltage controlled oscillator 1 is at temperature T 0 The corresponding control voltage Vctrl0, the temperature lookup table 21 sets the control terminal voltage of the variable capacitance unit 11 to Vctrl0 through the digital-to-analog converter 22, and the phase-locked loop sets the total capacitance value of the capacitance array 13 to be equal to F in Corresponding C b0 Thereby causing the phase locked loop to lock; after the phase-locked loop is locked, the input switch circuit 24 is closed and the control switch circuit 23 is opened, the voltage of the control terminal of the variable capacitance unit 11 is maintained by the stabilizing capacitor C0, and at this time, the oscillation frequency of the voltage-controlled oscillator 1 is the same as the frequency of the external input signal, namely:
let the operating temperature range of the voltage controlled oscillator 1 be (T 0 -ΔT，T 0 +ΔT）；
When the temperature is from T 0 Raised to (T) 0 +Δt), the oscillation frequency of the voltage-controlled oscillator 1 is reduced by Δf in order to lock the oscillation frequency of the voltage-controlled oscillator 1 to F in The phase-locked loop control input switching circuit 24 is opened and the control switching circuit 23 is closed, while the temperature lookup table 21 finds that the voltage-controlled oscillator 1 is at a temperature (T 0 +Δt), and the temperature lookup table 21 drops the control terminal voltage of the variable capacitance unit 11 from Vctrl0 to (Vctrl 0- Δv) through the digital-to-analog converter 22, thereby increasing the oscillation frequency of the voltage-controlled oscillator 1 by Δf to lock the oscillation frequency of the voltage-controlled oscillator 1 at F in Causing the phase locked loop to relock; when the temperature is from T 0 Down to (T) 0 - Δt), the oscillation frequency of the voltage-controlled oscillator 1 is raised by Δf in order to lock the oscillation frequency of the voltage-controlled oscillator 1 at F in The phase-locked loop control input switching circuit 24 is opened and the control switching circuit 23 is closed, while the temperature lookup table 21 finds that the voltage-controlled oscillator 1 is at a temperature (T 0 - Δt), and the temperature lookup table 21 increases the control terminal voltage of the variable capacitance unit 11 from Vctrl0 to (vctrl0+Δv) through the digital-to-analog converter 22, thereby decreasing the oscillation frequency of the voltage-controlled oscillator 1 by Δf such that the oscillation frequency of the voltage-controlled oscillator 1 is locked at F in Causing the phase locked loop to relock; when the phase-locked loop is locked again, the phase-locked loop control input switching circuit 24 is closed and the control switching circuit 23 is opened, and the control terminal voltage of the variable capacitance unit 11 is maintained by the stabilizing capacitor C0. As can be seen from the foregoing, in the operating temperature range (T 0 -ΔT，T 0 +Δt), the voltage regulation range required for the control terminal voltage of the variable capacitance unit 11 of the present invention is (vctrl0- Δv, vctrl0+Δv);
if the control voltage adaptive circuit 2 of the present invention is not used, the voltage controlled oscillator 1 is controlled at the highest temperature (T 0 +Δt), the control terminal voltage of the variable capacitance unit 11 is first set at the voltage Vctrl0, when the temperature of the voltage-controlled oscillator 1 drops to (T 0 - Δt) in order to lock the oscillation frequency of the voltage-controlled oscillator 1 at F in The pll increases the voltage of the control terminal of the variable capacitance unit 11 to about (vctrl0+2×Δv); similarly, when the voltage-controlled oscillator 1 is at the lowest temperature (T 0 - Δt), the control terminal voltage of the variable capacitance unit 11 is first set at the voltage Vctrl0, when the temperature of the voltage-controlled oscillator 1 rises to (T 0 +Δt), in order to lock the oscillation frequency of the voltage-controlled oscillator 1 at F in The pll is required to drop the voltage at the control terminal of the variable capacitance unit 11 to about (Vctrl 0-2 Δv); as can be seen from the foregoing, in the operating temperature range (T 0 -ΔT，T 0 +Δt), the voltage adjustment range required for the control terminal voltage of the variable capacitance unit 11 of the present invention is (vctrl0-2×Δv, vctrl0+2×Δv).
As can be seen from the above, the voltage adjusting range required by the temperature compensation of the control terminal voltage of the variable capacitance unit 11 can be effectively reduced by controlling the voltage adaptive circuit 2, so that the risk of losing lock of the phase-locked loop due to temperature change can be effectively reduced.
In summary, the invention can carry out self-adaptive temperature control on the voltage of the control terminal of the variable capacitance unit 11 by controlling the voltage self-adaptive circuit 2, so that the invention does not change the characteristic that the oscillation frequency of the voltage-controlled oscillator 1 changes along with the temperature, and the invention directly reduces the variation of the voltage of the control terminal of the variable capacitance unit 11 along with the temperature, thereby effectively reducing the risk of losing lock of the phase-locked loop caused by the temperature variation.
The above examples and drawings are not intended to limit the form or form of the present invention, and any suitable variations or modifications thereof by those skilled in the art should be construed as not departing from the scope of the present invention.

Claims (8)

1. A voltage controlled oscillator temperature compensation circuit for a phase locked loop, comprising: the voltage-controlled oscillator comprises a voltage-controlled oscillator and a control voltage self-adaptive circuit;
the voltage controlled oscillator has a variable capacitance unit;
the control voltage self-adaptive circuit comprises a temperature lookup table, a digital-to-analog converter, a control switch circuit, an input switch circuit and a voltage stabilizing capacitor, wherein the temperature lookup table is connected with the input end of the control switch circuit through the digital-to-analog converter, the output end of the control switch circuit, the output end of the input switch circuit and the first end of the voltage stabilizing capacitor are connected with the control end of the variable capacitance unit, and the second end of the voltage stabilizing capacitor is grounded;
the temperature lookup table outputs a corresponding digital control voltage signal according to the temperature of the voltage-controlled oscillator, the digital control voltage signal is converted into an analog control voltage signal through the digital-to-analog converter, and the analog control voltage signal is input to the control end of the variable capacitance unit through the control switch circuit to correspondingly adjust the voltage of the control end of the variable capacitance unit.
2. The voltage controlled oscillator temperature compensation circuit of a phase locked loop of claim 1, wherein: the variable capacitance unit is coupled between a first oscillation output terminal and a second oscillation output terminal of the voltage-controlled oscillator.
3. A voltage controlled oscillator temperature compensation circuit for a phase locked loop as claimed in claim 2, wherein: the variable capacitance unit comprises a first capacitor and a second capacitor, the first end of the first capacitor and the first end of the second capacitor are respectively connected with a first oscillation output end and a second oscillation output end of the voltage-controlled oscillator, and the second end of the first capacitor and the second end of the second capacitor are connected with a control end of the variable capacitance unit.
4. A voltage controlled oscillator temperature compensation circuit for a phase locked loop as claimed in claim 2, wherein: the voltage-controlled oscillator is also provided with an inductance unit and a capacitance array; the inductance unit is coupled between a first oscillation output end and a second oscillation output end of the voltage-controlled oscillator, and the capacitance array is coupled between the first oscillation output end and the second oscillation output end of the voltage-controlled oscillator and comprises a plurality of capacitance branches connected in parallel.
5. The voltage controlled oscillator temperature compensation circuit of a phase locked loop of claim 4, wherein: the inductance unit comprises an oscillation inductance of which two ends are respectively connected with a first oscillation output end and a second oscillation output end of the voltage-controlled oscillator.
6. The voltage controlled oscillator temperature compensation circuit of a phase locked loop of claim 4, wherein: the capacitive branch circuit comprises a first branch circuit capacitor, a second branch circuit capacitor and an electronic switch, wherein the first end of the first branch circuit capacitor and the first end of the second branch circuit capacitor are respectively connected with a first oscillation output end and a second oscillation output end of the voltage-controlled oscillator, and the electronic switch is connected in series between the second end of the first branch circuit capacitor and the second end of the second branch circuit capacitor.
7. The voltage controlled oscillator temperature compensation circuit of a phase locked loop of claim 4, wherein: the voltage-controlled oscillator also has a negative resistance unit coupled between the first oscillation output terminal and the second oscillation output terminal of the voltage-controlled oscillator.
8. The voltage controlled oscillator temperature compensation circuit of a phase locked loop of claim 7 wherein: the negative resistance unit comprises a first PMOS tube, a second PMOS tube, a first NMOS tube, a second NMOS tube and a tail current source, wherein the source electrode of the first PMOS tube and the source electrode of the second PMOS tube are connected with a working power supply, the drain electrode of the first PMOS tube, the drain electrode of the first NMOS tube, the grid electrode of the second PMOS tube and the grid electrode of the second NMOS tube are connected with a first oscillation output end of the voltage-controlled oscillator, the grid electrode of the first PMOS tube, the grid electrode of the first NMOS tube, the drain electrode of the second NMOS tube and the drain electrode of the second NMOS tube are connected with a second oscillation output end of the voltage-controlled oscillator, and the source electrode of the first NMOS tube and the source electrode of the second NMOS tube are grounded through the tail current source.
CN202311101526.4A 2023-08-30 2023-08-30 Voltage-controlled oscillator temperature compensation circuit of phase-locked loop Pending CN116846340A (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050035797A1 (en) * 2003-08-11 2005-02-17 Rambus, Inc. Compensator for leakage through loop filter capacitors in phase-locked loops
CN102017417A (en) * 2008-04-22 2011-04-13 高通股份有限公司 Voltage controlled oscillator temperature compensation using auxiliary varactor
CN115118278A (en) * 2021-03-17 2022-09-27 上海禾赛科技有限公司 Voltage-controlled oscillator, phase-locked loop circuit, optical detection device and laser radar
CN115833748A (en) * 2022-12-23 2023-03-21 上海川土微电子有限公司 Frequency adjustment circuit and method for voltage-controlled oscillator with temperature compensation function

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050035797A1 (en) * 2003-08-11 2005-02-17 Rambus, Inc. Compensator for leakage through loop filter capacitors in phase-locked loops
CN102017417A (en) * 2008-04-22 2011-04-13 高通股份有限公司 Voltage controlled oscillator temperature compensation using auxiliary varactor
CN115118278A (en) * 2021-03-17 2022-09-27 上海禾赛科技有限公司 Voltage-controlled oscillator, phase-locked loop circuit, optical detection device and laser radar
CN115833748A (en) * 2022-12-23 2023-03-21 上海川土微电子有限公司 Frequency adjustment circuit and method for voltage-controlled oscillator with temperature compensation function

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