CN-114499510-B - Injection locking two-frequency dividing circuit and control method

CN114499510BCN 114499510 BCN114499510 BCN 114499510BCN-114499510-B

Abstract

The application discloses an injection locking two-frequency-dividing circuit and a control method, which relate to the technical field of circuits, have adjustable injection voltage and can expand the working range of a two-frequency divider. The injection locking frequency division circuit comprises an orthogonal frequency divider and a voltage injection module, wherein the orthogonal frequency divider is used for generating an orthogonal differential signal according to an input differential clock signal, and the voltage injection module is used for adjusting injection voltage output to the orthogonal frequency divider according to a voltage adjusting instruction, wherein the voltage adjusting instruction is determined according to the amplitude and the frequency of the differential clock signal.

Inventors

TIAN TIAN
ZHANG YUCHENG

Assignees

浙江科睿微电子技术有限公司
浙江科睿微电子技术有限公司

Dates

Publication Date: 20260421
Application Date: 20220106
Priority Date: 20220106

Claims (8)

1. An injection-locked divide-by-two circuit, comprising: the quadrature frequency divider is used for generating a quadrature differential signal according to an input differential clock signal; The voltage injection module is used for adjusting injection voltage output to the orthogonal frequency divider according to a voltage adjustment instruction, wherein the voltage adjustment instruction is determined according to the amplitude and the frequency of the differential clock signal; the voltage injection module includes: An output unit for outputting the injection voltage to the quadrature divide-by-two divider; An adjusting unit for adjusting a current flowing through the output unit according to the voltage adjustment instruction to adjust the injection voltage; the adjusting unit comprises at least one fixed conduction subunit and at least one current adjusting subunit, the current adjusting subunit is used for conducting or disconnecting according to the voltage adjusting instruction, and the number of the current adjusting subunits is used for determining an adjusting gear and an adjusting range of the injection voltage of the voltage injection module.
2. The injection locking frequency division circuit according to claim 1, wherein the output unit comprises a first MOS transistor and a large resistor, a drain electrode of the first MOS transistor is electrically connected to the adjusting unit, a source electrode of the first MOS transistor is grounded, one end of the large resistor is electrically connected to a gate electrode of the first MOS transistor, and a voltage at the other end of the large resistor is the injection voltage.
3. The injection locked divide-by-two circuit of claim 1, wherein the current regulation subunit comprises at least one regulation leg.
4. The injection locked divide-by-two circuit of claim 3 wherein said current regulation subunit comprises at least two of said regulation legs, all of said regulation legs within a same said current regulation subunit being connected in parallel with each other.
5. The injection-locked divide-by-two circuit of claim 3, wherein the regulation branch comprises a second MOS transistor and a switch, the second MOS transistor being in series with the switch; the switch is used for being closed or opened according to the voltage regulation command so as to control the connection or disconnection of the regulation branch.
6. The injection locked divide-by-two circuit of claim 1, further comprising: and the current mirror module is electrically connected with the voltage injection module.
7. A method of controlling an injection-locked divide-by-two circuit, comprising: determining a voltage regulation command according to the amplitude and the frequency of the input differential clock signal; adjusting injection voltage according to the voltage adjustment command; and generating a quadrature differential signal according to the adjusted injection voltage.
8. The method of claim 7, further comprising, prior to determining the voltage adjustment command based on the amplitude and frequency of the input differential clock signal: drawing a self-resonance sensitivity curve of the orthogonal two-frequency divider corresponding to each injection voltage output by the voltage injection module; The determining the voltage regulation command according to the amplitude and the frequency of the input differential clock signal comprises the following steps: Searching a self-resonance frequency closest to the frequency of the differential clock signal under the amplitude of the input differential clock signal in the self-resonance sensitivity curve of the orthogonal frequency divider, and determining the injection voltage corresponding to the searched self-resonance frequency as a target injection voltage; And generating the voltage regulation command according to the target injection voltage.

Description

Injection locking two-frequency dividing circuit and control method Technical Field The application relates to the technical field of circuits, in particular to an injection locking frequency division circuit and a control method. Background Mixers in quadrature frequency conversion transceivers require a set of quadrature differential signals that are used for frequency conversion, typically using a divide-by-two divider to produce the quadrature differential signal based on a stable frequency signal produced by a radio frequency phase locked loop. However, the operating frequency range of the existing injection locked divide-by-two frequency divider is relatively narrow, once the input signal frequency is higher or lower than the locked operating range, the frequency divider will be out of lock, and the output frequency will no longer be 1/2 of the input frequency. Disclosure of Invention The embodiment of the application provides an injection locking two-frequency dividing circuit and a control method, wherein the injection voltage is adjustable, and the working range of the two-frequency divider can be enlarged. In a first aspect of an embodiment of the present application, there is provided an injection locking divide-by-two circuit, including: the quadrature frequency divider is used for generating a quadrature differential signal according to an input differential clock signal; and the voltage injection module is used for adjusting the injection voltage output to the orthogonal frequency divider according to a voltage adjustment instruction, wherein the voltage adjustment instruction is determined according to the amplitude and the frequency of the differential clock signal. In some embodiments, the voltage injection module comprises: An output unit for outputting the injection voltage to the quadrature divide-by-two divider; And the adjusting unit is used for adjusting the current flowing through the output unit according to the voltage adjusting instruction so as to adjust the injection voltage. In some embodiments, the output unit includes a first MOS transistor and a large resistor, a drain of the first MOS transistor is electrically connected to the adjusting unit, a source of the first MOS transistor is grounded, one end of the large resistor is electrically connected to a gate of the first MOS transistor, and a voltage at the other end of the large resistor is the injection voltage. In some embodiments, the regulation unit comprises at least one fixed conduction subunit and at least one current regulation subunit for switching on or off according to the voltage regulation instruction. In some embodiments, the current regulation subunit includes at least one regulation leg. In some embodiments, the current regulation subunit includes at least two of the regulation branches, all of the regulation branches within the same current regulation subunit being connected in parallel with each other. In some embodiments, the regulation branch comprises a second MOS transistor and a switch, the second MOS transistor being in series with the switch; the switch is used for being closed or opened according to the voltage regulation command so as to control the connection or disconnection of the regulation branch. In some embodiments, the injection-locked divide-by-two circuit further comprises: and the current mirror module is electrically connected with the voltage injection module. In a second aspect of the embodiment of the present application, a control method for an injection locking divide-by-two circuit is provided, including: determining a voltage regulation command according to the amplitude and the frequency of the input differential clock signal; adjusting injection voltage according to the voltage adjustment command; and generating a quadrature differential signal according to the adjusted injection voltage. In some embodiments, before the determining the voltage adjustment command according to the amplitude and the frequency of the input differential clock signal, the method further includes: drawing a self-resonance sensitivity curve of the orthogonal two-frequency divider corresponding to each injection voltage output by the voltage injection module; The determining the voltage regulation command according to the amplitude and the frequency of the input differential clock signal comprises the following steps: Searching a self-resonance frequency closest to the frequency of the differential clock signal under the amplitude of the input differential clock signal in the self-resonance sensitivity curve of the orthogonal frequency divider, and determining the injection voltage corresponding to the searched self-resonance frequency as a target injection voltage; And generating the voltage regulation command according to the target injection voltage. According to the injection locking divide-by-two circuit and the control method provided by the embodiment of the application, the voltage injection mo