CN113114113A - Frequency signal generating circuit and method based on double-frequency wireless power supply - Google Patents
Frequency signal generating circuit and method based on double-frequency wireless power supply Download PDFInfo
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Abstract
The invention belongs to the field of wireless communication chips, and relates to a frequency generation circuit and a frequency generation method based on dual-frequency wireless power supply, wherein the circuit comprises: the radio frequency signal processing device comprises a transmitting end, a mutual inductance antenna, a resonant network, a rectifier, a filter and an oscillator, wherein the transmitting end generates two radio frequency signals with different frequencies, the mutual inductance antenna comprises a transmitting antenna T1 and a receiving antenna T2, the receiving antenna T2 receives the radio frequency signals, the output end of the receiving antenna T2 is connected to the resonant network and then connected with the rectifier, the output end of the rectifier is connected with the input end of the filter, the filter suppresses irrelevant frequency signals in the output of the rectifier, amplifies required frequency signals and inputs the amplified signals to the oscillator as reference signals. In the wireless power supply system, the wireless power supply signal is utilized to generate a frequency signal for a circuit on the chip, the frequency signal can be used for a clock, a communication circuit and the like of a chip circuit, off-chip elements such as a crystal oscillator and a frequency divider are not needed, the integration level of the chip is improved, and the area and the power consumption of the chip are obviously reduced.
Description
Technical Field
The invention belongs to the field of wireless communication chips, and relates to a frequency signal generating circuit and method based on dual-frequency wireless power supply.
Background
Usually, a frequency signal is required in a chip circuit, a clock for the circuit, or a local oscillator signal, a carrier generation signal, etc. of a communication circuit. Currently, for frequency signals required in a chip circuit, an off-chip crystal oscillator, an on-chip oscillator, or a radio frequency signal supplied wirelessly is used for frequency division in the existing method. The use of an off-chip crystal oscillator provides accurate frequency signals, but increases the size and power consumption of the system. The use of on-chip oscillators can avoid discrete components outside the chip, but the on-chip oscillators are affected by process, voltage and temperature, and the oscillation frequency cannot be accurately controlled. The low-frequency signal can be obtained by collecting and dividing the radio-frequency signal wirelessly supplied, but the dynamic power consumption and the chip area of the chip can be increased by high frequency division times.
Disclosure of Invention
In order to solve the technical problems in the prior art, the invention provides a frequency signal generating circuit and a method based on dual-frequency wireless power supply, and the specific technical scheme is as follows:
a frequency signal generating circuit based on dual-frequency wireless power supply, comprising: the antenna comprises a transmitting end, a mutual inductance antenna, a resonant network, a rectifier, a filter and an oscillator, wherein the transmitting end comprises radio frequency signal sources f1 and f2, power amplifiers PA1 and PA2 and a power combiner P, and the mutual inductance antenna comprises: the receiving antenna T2 receives the radio frequency signals, the output end of the receiving antenna T2 is connected to a resonant network, the resonant network resonates with the receiving antenna T3535, the output end of the resonant network is connected to a rectifier, the output end of the rectifier is connected to the input end of a filter, the filter suppresses irrelevant frequency signals in the output of the rectifier, amplifies the required frequency signals and inputs the amplified frequency signals to the oscillator as reference signals;
the transmitter is used for transmitting radio frequency signals of two different frequencies, the receiving antenna T2 and the resonant network are used for receiving the radio frequency signals of the two different frequencies transmitted by the transmitting antenna T1, the radio frequency signals are input to the rectifier, the resonant network is used for realizing maximum gain transmission of the radio frequency signals, the rectifier is used for rectifying the received radio frequency signals into direct current voltage and inputting the signals into the filter after noise reduction, harmonic signals of different orders and different frequencies are contained in the output direct current voltage due to nonlinearity of the rectifier, the filter is used for filtering and amplifying the input signals, irrelevant frequency signals are inhibited by adjusting the passband range of the filter, required frequency signals are obtained and are input into the oscillator for reference signals of the oscillator.
Preferably, the transmitting end includes: the antenna comprises a first radio-frequency signal source f1, a second radio-frequency signal source f2, a first power amplifier PA1, a second power amplifier PA2 and a power combiner P, wherein the first radio-frequency signal source f1 and the second radio-frequency signal source f2 are respectively input into a first power amplifier PA1 and a second power amplifier PA2, output ends of the first power amplifier PA1 and the second power amplifier PA2 are both connected to an input end of the power combiner P, an output end of the power combiner P is connected to a transmitting antenna T1, the receiving antenna T2 and the transmitting antenna T1 are coupled through inductance, the resonant network comprises a resonant capacitor C1, and the resonant capacitor C1 resonates with the receiving antenna T2 on communication frequency to achieve maximum gain transmission of radio-frequency signals.
Preferably, the rectifier is composed of a plurality of rectifying circuits and a decoupling capacitor C2, and the rectifying circuits include: the grid electrode of the first NMOS tube is connected with the grid electrode of the first PMOS tube, the grid electrode of the second NMOS tube is connected with the grid electrode of the second PMOS tube, the drain electrode of the first NMOS tube is connected with the drain electrode of the first PMOS tube, the drain electrode of the second NMOS tube is connected with the drain electrode of the second PMOS tube, the source electrode of the first NMOS tube is connected with the source electrode of the second NMOS tube and then grounded, the source electrode of the first PMOS tube is connected with the source electrode of the second PMOS tube and then connected with a next group of rectifying circuits, the common node of the drain electrode of the first NMOS tube and the drain electrode of the first PMOS tube is connected with the common node of the grid electrode of the second NMOS tube and the grid electrode of the second PMOS tube, the common node of the grid electrode of the first NMOS tube and the grid electrode of the first PMOS tube is connected with the drain electrode of the second NMOS tube and the drain electrode of the second PMOS tube, one end of the first capacitor is connected to a common node where the drain electrode of the first NMOS transistor is connected with the drain electrode of the first PMOS transistor, the other end of the first capacitor is connected to one end of the resonant capacitor C1, one end of the second capacitor is connected to a common node where the drain electrode of the second NMOS transistor is connected with the drain electrode of the second PMOS transistor, and the other end of the second capacitor is connected to the other end of the resonant capacitor C1. One end of the decoupling capacitor C2 is connected to the node between the rectifier and the filter, and the other end of the decoupling capacitor C2 is grounded.
Preferably, the filter includes a band-pass filter, a resistance feedback amplifier, an inverter, and a pulse generator, the center frequency of the band-pass filter is a second-order intermodulation signal frequency, suppresses other harmonic signals, and obtains a second-order intermodulation signal, the output of the band-pass filter is connected to the resistance feedback amplifier, amplifies the swing of the second-order intermodulation signal, and then obtains a square wave signal through the inverter, the square wave signal is input to the pulse generator to generate a pulse signal, and the pulse signal is input to the oscillator as a reference signal, so that the oscillator follows the frequency of the reference signal to generate a desired frequency signal.
A frequency signal generation method based on dual-frequency wireless power supply specifically comprises the following steps: the receiving antenna T2 receives two radio frequency signals with different frequencies transmitted by the transmitting antenna T1, then the radio frequency signals are input to the rectifier, the rectifier rectifies the radio frequency signals into direct current voltage, due to nonlinearity of the rectifier, the output direct current voltage contains harmonic signals with different orders, the harmonic signals are input to the filter after noise reduction is carried out on the harmonic signals through the decoupling capacitor C2, irrelevant frequency signals are suppressed by adjusting the passband range of the filter, required frequency signals are obtained, meanwhile, signal swing is amplified, and the signals are input to the oscillator and used for reference signals of the oscillator.
Has the advantages that:
in the wireless power supply chip system, the required frequency signal is provided for the chip, a crystal oscillator is not needed, and the integration level of the chip is improved; compared with the scheme of the traditional on-chip free oscillator, the frequency signal generated by the invention is based on injection locking and has the advantage of low noise; meanwhile, the required frequency signal is generated through second-order nonlinearity of the two frequency signals, which is different from the traditional frequency generation based on the wireless power supply signal.
Drawings
FIG. 1 is a circuit schematic of the present invention;
FIG. 2 is a circuit diagram of the present invention;
fig. 3 is a circuit schematic diagram of embodiment 1 of the present invention;
fig. 4 is a circuit schematic diagram of embodiment 2 of the present invention;
fig. 5 is a circuit schematic diagram of embodiment 3 of the present invention.
Detailed Description
In order to make the objects, technical solutions and effects of the present invention more clearly understood, the present invention is further described in detail below with reference to the drawings and examples of the specification.
As shown in fig. 1 and 2, a frequency signal generating circuit based on dual-frequency wireless power supply uses two frequency signals f1 and f2 for wireless power supply, and transmits the wireless power supply to a rectifier after being received by an antenna, because of the nonlinearity of the rectifier, the output of the rectifier contains a second-order intermodulation signal of difference frequency of two transmitting frequencies and harmonic waves of different orders, the output of the rectifier is filtered by a band-pass filter to suppress irrelevant frequency signals to obtain a required second-order intermodulation signal, then a resistance feedback amplifier amplifies the swing of the signal, the second-order intermodulation signal is amplified into a square wave by an inverter, the square wave is converted into a pulse wave by a pulse generating circuit, the pulse wave can be used as a reference signal of an oscillator circuit, the oscillation frequency of the oscillator follows a fixed reference frequency, the influence of conditions such as process, temperature, voltage and the like on the oscillation frequency of the oscillator is solved, and the power consumption and the area are saved at the, the scheme of using an off-chip crystal oscillator is avoided.
Specifically, the circuit includes: the antenna comprises a transmitting terminal, a mutual inductance antenna, a resonant network, a rectifier, a filter and an oscillator.
The transmitter includes: the antenna comprises a first radio frequency signal source f1, a second radio frequency signal source f2, a first power amplifier PA1, a second power amplifier PA2 and a power combiner P, wherein the mutual inductance antenna consists of a transmitting antenna T1 and a receiving antenna T2.
The first radio frequency signal source f1 and the second radio frequency signal source f2 are respectively input into a first power amplifier PA1 and a second power amplifier PA2, output ends of the first power amplifier PA1 and the second power amplifier PA2 are both connected to an input end of a power combiner P, an output end of the power combiner P is connected to a transmitting antenna T1, the receiving antenna T2 and the transmitting antenna T1 are inductively coupled and connected in parallel with a resonant network, the resonant network is a resonant capacitor C1, and the resonant capacitor C1 resonates with the receiving antenna T2 on communication frequency to realize maximum gain transmission of radio frequency signals; the input end of the receiving antenna T2 receives the dual-frequency radio frequency signal transmitted by the transmitting antenna T1, and the output end is connected to the input end of the rectifier;
the rectifier comprises a plurality of rectifier circuits and decoupling capacitor C2, and the rectifier circuits include: the grid electrode of the first NMOS tube is connected with the grid electrode of the first PMOS tube, the grid electrode of the second NMOS tube is connected with the grid electrode of the second PMOS tube, the drain electrode of the first NMOS tube is connected with the drain electrode of the first PMOS tube, the drain electrode of the second NMOS tube is connected with the drain electrode of the second PMOS tube, the source electrode of the first NMOS tube is connected with the source electrode of the second NMOS tube and then grounded, the source electrode of the first PMOS tube is connected with the source electrode of the second PMOS tube and then connected with a next group of rectifying circuits, the common node of the drain electrode of the first NMOS tube and the drain electrode of the first PMOS tube is connected with the common node of the grid electrode of the second NMOS tube and the grid electrode of the second PMOS tube, the common node of the grid electrode of the first NMOS tube and the grid electrode of the first PMOS tube is connected with the drain electrode of the second NMOS tube and the drain electrode of the second PMOS tube, one end of the first capacitor is connected to a common node where the drain electrode of the first NMOS transistor is connected with the drain electrode of the first PMOS transistor, the other end of the first capacitor is connected to one end of the resonant capacitor C1, one end of the second capacitor is connected to a common node where the drain electrode of the second NMOS transistor is connected with the drain electrode of the second PMOS transistor, and the other end of the second capacitor is connected to the other end of the resonant capacitor C1. One end of the decoupling capacitor C2 is connected to a node between the rectifier and the filter, and the other end of the decoupling capacitor C2 is grounded;
the filter comprises a band-pass filter, a resistance feedback amplifier, an inverter and a pulse generator.
The output end of the rectifier is connected to a band-pass filter, the center frequency of the band-pass filter is the frequency of a second-order intermodulation signal, other harmonic signals are suppressed, the second-order intermodulation signal is obtained, the output of the band-pass filter is connected to a resistance feedback amplifier, the swing amplitude of the second-order intermodulation signal is amplified, and then the square wave signal is obtained through an inverter; inputting the square wave signal into a pulse generator to generate a pulse signal; the pulse signal is input to an oscillator as a reference signal, and the oscillator is made to follow the frequency of the reference signal to generate a desired frequency signal.
Example 1:
as shown in fig. 3: the circuit extracts a reference frequency signal required by the injection locking ring oscillator, inputs the frequency into the injection locking ring oscillator, provides a reference signal for the ring oscillator and generates a frequency signal following the reference signal.
Example 2:
as shown in fig. 4: the circuit extracts a reference frequency signal required by the injection locking LC oscillator, inputs the frequency into the injection locking LC oscillator and provides a reference signal for the LC oscillator, and the LC oscillator generates a frequency signal following the reference signal by adopting an injection locking technology.
Example 3:
as shown in fig. 5: the circuit extracts a reference signal of the frequency required by the phase-locked loop, inputs the frequency signal into the phase-locked loop and provides the reference signal for the phase-locked loop, and the phase-locked loop generates a frequency signal with the same frequency and phase as the reference signal.
In a wireless power supply chip system, the invention relates to a frequency signal generation method based on dual-frequency wireless power supply, which specifically comprises the following steps: the transmitting end transmits signals with two different frequencies, the receiving antenna T2 receives radio frequency signals with two different frequencies transmitted by the transmitting antenna T1, the radio frequency signals are input to the rectifier, the rectifier rectifies the radio frequency signals into direct current voltage, harmonic signals with different frequencies are output due to nonlinearity of the rectifier, and the harmonic signals are subjected to noise reduction through the decoupling capacitor C2 and then are filtered out of irrelevant harmonic components through the filter to obtain required frequency signals, so that different requirements of a system circuit are met, such as a clock of the circuit is provided, or local oscillation signals of a communication circuit, carrier generation signals and the like. The invention does not need crystal oscillator and frequency divider, has the advantage of low noise, and saves the area and power consumption of the chip.
Claims (5)
1. A frequency signal generating circuit based on dual-frequency wireless power supply, comprising: the antenna comprises a transmitting end, a mutual inductance antenna, a resonant network, a rectifier, a filter and an oscillator, wherein the transmitting end comprises radio frequency signal sources f1 and f2, power amplifiers PA1 and PA2 and a power combiner P, and the mutual inductance antenna comprises: the receiving antenna T2 receives the radio frequency signals, the output end of the receiving antenna T2 is connected to a resonant network, the resonant network resonates with the receiving antenna T3535, the output end of the resonant network is connected to a rectifier, the output end of the rectifier is connected to the input end of a filter, the filter suppresses irrelevant frequency signals in the output of the rectifier, amplifies the required frequency signals and inputs the amplified frequency signals to the oscillator as reference signals;
the transmitter is used for transmitting radio frequency signals of two different frequencies, the receiving antenna T2 and the resonant network are used for receiving the radio frequency signals of the two different frequencies transmitted by the transmitting antenna T1, the radio frequency signals are input to the rectifier, the resonant network is used for realizing maximum gain transmission of the radio frequency signals, the rectifier is used for rectifying the received radio frequency signals into direct current voltage and inputting the signals into the filter after noise reduction, the filter is used for filtering and amplifying the input signals, irrelevant frequency signals are inhibited by adjusting the pass band range of the filter, required frequency signals are obtained and input to the oscillator for reference signals of the oscillator.
2. The frequency signal generating circuit based on dual-frequency wireless power supply of claim 1, wherein the transmitting end comprises: the antenna comprises a first radio-frequency signal source f1, a second radio-frequency signal source f2, a first power amplifier PA1, a second power amplifier PA2 and a power combiner P, wherein the first radio-frequency signal source f1 and the second radio-frequency signal source f2 respectively input a first power amplifier PA1 and a second power amplifier PA2, output ends of the first power amplifier PA1 and the second power amplifier PA2 are connected to an input end of the power combiner P, an output end of the power combiner P is connected to a transmitting antenna T1, the receiving antenna T2 and the transmitting antenna T1 are coupled through inductance, the resonant network comprises a resonant capacitor C1, and the resonant capacitor C1 resonates with the receiving antenna T2 on communication frequency.
3. The frequency signal generating circuit based on dual-frequency wireless power supply as claimed in claim 1, wherein said rectifier is composed of a plurality of rectifying circuits and a decoupling capacitor C2, said rectifying circuits comprising: the grid electrode of the first NMOS tube is connected with the grid electrode of the first PMOS tube, the grid electrode of the second NMOS tube is connected with the grid electrode of the second PMOS tube, the drain electrode of the first NMOS tube is connected with the drain electrode of the first PMOS tube, the drain electrode of the second NMOS tube is connected with the drain electrode of the second PMOS tube, the source electrode of the first NMOS tube is connected with the source electrode of the second NMOS tube and then grounded, the source electrode of the first PMOS tube is connected with the source electrode of the second PMOS tube and then connected with a next group of rectifying circuits, the common node of the drain electrode of the first NMOS tube and the drain electrode of the first PMOS tube is connected with the common node of the grid electrode of the second NMOS tube and the grid electrode of the second PMOS tube, the common node of the grid electrode of the first NMOS tube and the grid electrode of the first PMOS tube is connected with the drain electrode of the second NMOS tube and the drain electrode of the second PMOS tube, one end of the first capacitor is connected to a common node where the drain electrode of the first NMOS tube is connected with the drain electrode of the first PMOS tube, the other end of the first capacitor is connected to one end of the resonant capacitor C1, one end of the second capacitor is connected to a common node where the drain electrode of the second NMOS tube is connected with the drain electrode of the second PMOS tube, the other end of the second capacitor is connected to the other end of the resonant capacitor C1, one end of the decoupling capacitor C2 is connected with the output end of the rectifier, and the other end of the decoupling capacitor C2 is grounded.
4. The circuit for generating a frequency signal based on dual-frequency wireless power supply according to claim 1, wherein the filter includes a band-pass filter, a resistive feedback amplifier, an inverter, and a pulse generator, the center frequency of the band-pass filter is a frequency of the second-order intermodulation signal, and other harmonic signals are suppressed to obtain the second-order intermodulation signal, the output of the band-pass filter is connected to the resistive feedback amplifier to amplify the swing of the second-order intermodulation signal, and then the square-wave signal is obtained through the inverter, and the square-wave signal is input to the pulse generator to generate a pulse signal, which is input to the oscillator as a reference signal, so that the oscillator follows the frequency of the reference signal to generate the desired frequency signal.
5. A frequency signal generation method based on dual-frequency wireless power supply is characterized by comprising the following steps: the receiving antenna T2 receives two radio frequency signals with different frequencies transmitted by the transmitting antenna T1, then the radio frequency signals are input to the rectifier, the rectifier rectifies the radio frequency signals into direct current voltage, due to nonlinearity of the rectifier, the output direct current voltage contains harmonic signals with different orders, the harmonic signals are input to the filter after noise reduction is carried out on the harmonic signals through the decoupling capacitor C2, irrelevant frequency signals are suppressed by adjusting the passband range of the filter, required frequency signals are obtained, meanwhile, signal swing is amplified, and the signals are input to the oscillator and used for reference signals of the oscillator.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114244388A (en) * | 2021-11-05 | 2022-03-25 | 浙江大学 | Reflection communication circuit and method based on double-frequency wireless power supply |
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Application publication date: 20210713 |