CN216252667U - Two-point modulation voltage-controlled oscillator and phase-locked loop system with same - Google Patents
Two-point modulation voltage-controlled oscillator and phase-locked loop system with same Download PDFInfo
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- CN216252667U CN216252667U CN202122601209.1U CN202122601209U CN216252667U CN 216252667 U CN216252667 U CN 216252667U CN 202122601209 U CN202122601209 U CN 202122601209U CN 216252667 U CN216252667 U CN 216252667U
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Abstract
The utility model discloses a two-point modulation voltage-controlled oscillator and a phase-locked loop system with the oscillator, which comprise an LC voltage-controlled oscillator, a linearization voltage-controlled circuit and a bias circuit, wherein the bias circuit provides bias voltage required by the linearization voltage-controlled circuit, and the linearization voltage-controlled circuit adjusts the capacitance load of the LC voltage-controlled oscillator according to the values of two paths of analog voltage signals to realize different oscillation frequencies. The utility model constructs a frequency modulation continuous wave frequency source by adopting the two-point modulation voltage-controlled oscillator, can realize wider frequency modulation range compared with the traditional phase-locked loop framework, supports various modulation types, is an ideal frequency source of the millimeter wave radar system for the phase-locked loop system, improves the integration level of the millimeter wave radar system, reduces the system cost and is worthy of popularization and application.
Description
Technical Field
The utility model relates to the technical field of radio frequency and analog integrated circuits, in particular to a two-point modulation voltage-controlled oscillator and a phase-locked loop system with the same.
Background
With the popularization of millimeter wave radar transceiver chips, especially the breakthrough of 77GHz millimeter wave chips in the CMOS process field, the demand of sensors based on millimeter wave radar is increasing day by day. The application range of the millimeter wave radar is also expanded to application scenes with detection distances of 0-40 m, such as security imaging, vital sign detection, gesture recognition and the like.
For a short-distance or ultra-short-distance millimeter wave radar receiving and transmitting system, a frequency modulation continuous wave frequency source with low phase noise is required, and performance indexes such as various modulation types (triangular waves or sawtooth waves), coverage of a certain frequency table range and the like are supported. The traditional charge pump phase-locked loop and LC voltage-controlled oscillator structures are difficult to cover a wide frequency modulation frequency range, the stray capacity is reduced, and the requirements of a millimeter wave radar system are difficult to meet.
SUMMERY OF THE UTILITY MODEL
The technical problem to be solved by the utility model is as follows: how to solve the problem that the traditional LC voltage-controlled oscillator structure is difficult to cover a wide frequency modulation frequency range and meet the requirements of a millimeter wave radar system, and provides a two-point modulation voltage-controlled oscillator.
The utility model solves the technical problems through the following technical scheme, and comprises an LC voltage-controlled oscillator, a linearization voltage-controlled circuit and a bias circuit, wherein the bias circuit is connected with the linearization voltage-controlled circuit, the linearization voltage-controlled circuit is connected with the LC voltage-controlled oscillator, the bias voltage required by the linearization voltage-controlled circuit is provided through the bias circuit, and the linearization voltage-controlled circuit controls the frequency of the LC voltage-controlled oscillator according to the control voltage generated by a digital-to-analog converter and the control voltage generated by a phase-locked loop.
The utility model also provides a phase-locked loop system, which is characterized in that: the system comprises a control voltage generation system, a digital-to-analog conversion open-loop control system, a continuous adjustable fractional frequency division system and the two-point modulation voltage-controlled oscillator; the continuous adjustable fractional frequency division system, the digital-to-analog conversion open-loop control system and the two-point modulation voltage-controlled oscillator are sequentially connected, the digital-to-analog conversion open-loop control system is connected with the two-point modulation voltage-controlled oscillator, the control voltage generation system performs closed-loop control on the frequency of the two-point modulation voltage-controlled oscillator through a digital control signal, and the digital-to-analog conversion open-loop control system performs open-loop control on the frequency of the two-point modulation voltage-controlled oscillator through a digital control signal.
Furthermore, the control voltage generation system comprises a phase frequency detector, a charge pump and a loop filter which are connected in sequence, wherein the loop filter is connected with one input end of the two-point modulation voltage-controlled oscillator, one input end of the phase frequency detector inputs a reference crystal oscillator signal, and the other input end of the phase frequency detector is connected with the output end of the continuously adjustable fractional frequency division system.
Still further, the continuously adjustable fractional divider system includes a high speed 2 divider, an analog 8/9 divider, a programmable digital divider, a Sigma-Delta modulator, the input end of the high-speed 2 frequency divider is connected with the output end of the two-point modulation voltage-controlled oscillator, the output end of the high-speed 2 frequency divider is connected with the input end of the analog 8/9 frequency divider, the output end of the analog 8/9 frequency divider is connected with a programmable digital frequency divider, the input end of the Sigma-Delta modulator inputs a digital control signal containing a frequency dividing ratio, the output end of the Sigma-Delta modulator is connected with the programmable digital frequency divider, the programmable digital frequency divider outputs a modulation signal according to the digital control signal to set the analog 8/9 frequency divider to form fractional frequency division, the output end of the programmable digital frequency divider is connected with one input end of the phase frequency detector.
Furthermore, the digital-to-analog conversion open-loop control system comprises a digital-to-analog converter, wherein the input end of the digital-to-analog converter inputs a digital control signal, and the output end of the digital-to-analog converter is connected with one input end of the two-point modulation voltage-controlled oscillator.
Furthermore, the phase-locked loop system also comprises a digital frequency sweeping signal generator, one path of the digital frequency sweeping signal generator is connected with a fractional frequency divider to control the frequency dividing ratio, and the other path of the digital frequency sweeping signal generator generates an oscillator open-loop control voltage through a digital-to-analog converter.
Compared with the prior art, the utility model has the following advantages: the frequency modulation continuous wave frequency source is constructed by adopting the two-point modulation voltage-controlled oscillator, and compared with the traditional phase-locked loop framework, the frequency modulation continuous wave frequency source can realize a wider frequency modulation range, supports various modulation types, is an ideal frequency source of the millimeter wave radar system for the phase-locked loop system, improves the integration level of the millimeter wave radar system, reduces the system cost, and is worthy of popularization and application.
Drawings
FIG. 1 is a schematic diagram of a two-point modulation frequency modulated continuous wave PLL system according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a two-point modulation vco system according to an embodiment of the present invention.
In the figure: 110. inputting a digital control signal; 120. inputting a crystal oscillator signal; 130. outputting a frequency signal; 140. a phase-locked loop system; 210. two-point modulation voltage controlled oscillator system; 220. a digital-to-analog converter; 230. a charge pump phase-locked loop controls the voltage generation system; 240. a continuously adjustable fractional frequency division system; 250. a digital sweep signal generator; 310. a phase frequency detector; 320. a charge pump; 330. a loop filter; 410. a high-speed divide-by-two frequency divider; 420. a multi-mode scaler (8/9 frequency division); 430. a Sigma-Delta modulator; 440. a digitally programmable frequency divider; 510. an LC voltage controlled oscillator; 520. linearizing a voltage controlled circuit network; 530. a bias circuit; 610. an oscillator inductance; 620. an oscillator MOS pair transistor; 630. suppressing second harmonic inductance; 640. a tail current source; 710. a fixed bias capacitance; 720. a fixed bias resistor; 730. and electrically controlling the MOS capacitor.
Detailed Description
The following examples are given for the detailed implementation and specific operation of the present invention, but the scope of the present invention is not limited to the following examples.
As shown in fig. 1, the present embodiment provides a technical solution: a two-point modulated frequency modulated continuous wave phase locked loop system 140, the phase locked loop system comprising: the charge pump phase-locked loop control voltage generation system 230, the digital-to-analog conversion open-loop control system, the continuously adjustable fractional frequency division system 240 and the two-point modulation voltage-controlled oscillator system 210.
In this embodiment, the charge pump pll control voltage generating system 230 includes circuit blocks such as a phase frequency detector 310, a charge pump 320, a loop filter 330, and so on. During normal operation, the phase frequency detector 310 compares the input reference crystal oscillator signal with the output phase difference pulse of the output signal of the continuous adjustable fractional frequency division system 240, the charge pump 320 converts the output pulse signal of the phase frequency detector 310 into charge and discharge current, and the loop filter 330 converts the charge and discharge current of the charge pump 320 into a voltage control signal to control the frequency of the two-point modulation voltage-controlled oscillator system 210. The system works in a closed loop mode, the frequency of the two-point modulation voltage-controlled oscillator system 210 is locked to the frequency set by the continuous adjustable fractional frequency division system 240, and the frequency drift of the oscillator is restrained.
In this embodiment, the digital-to-analog conversion open-loop control system includes circuit modules such as the digital sweep signal generator 250 and the digital-to-analog converter 220. In normal operation, the digital sweep signal generator 250 generates a corresponding digital control signal, and the dac 220 directly converts the digital control signal into an analog signal to control the frequency of the two-point modulation vco system 210. The system works in an open loop mode, the digital signal directly modulates the frequency of the oscillator, and the frequency coverage range and the frequency modulation rate of the oscillator are improved.
In this embodiment, the continuously adjustable fractional divider system 240 includes a high speed divider-by-two 410, a multi-modulus scaler (divide by 8/9, i.e., analog divider 8/9) 420, a digital programmable divider 440, a Sigma-Delta modulator 430, and other circuit blocks. During normal operation, the digital sweep signal generator 250 generates a digital control signal with a corresponding frequency division ratio, the digital programmable frequency divider 440 sets a specific frequency division ratio according to the digital control signal, and the Sigma-Delta modulator 430 outputs a modulation signal according to the digital control signal to set the analog 8/9 frequency divider to form fractional frequency division. The system can be programmed to set a continuously adjustable fractional division ratio.
In the present embodiment, the two-point modulation vco system 210 includes circuit blocks such as an LC vco 510, a linearizer network 520, a bias circuit 530, and the like. In normal operation, the bias circuit module 530 biases the linearized voltage control circuit network 520 by performing resistance voltage division on the external bias voltage signal Vbias to obtain bias voltage signals Vb1, Vb2, Vb3, and the like. The linearized voltage-controlled circuit network 520 includes 4 groups of a fixed bias capacitor 710, a fixed bias resistor 720, and an electrically controlled MOS capacitor 730, and performs linearization optimization on the voltage-controlled frequency modulation. The LC vco 510 includes an oscillator inductor 610 (integrated inductor) 610, an oscillator MOS pair transistor 620 (coupled differential pair that creates negative resistance), a second harmonic rejection inductor 630 (reduces tail current source phase noise inductance), and a tail current source 640, forming an oscillating signal.
In this embodiment, the phase-locked loop system 10 can generate a radio frequency source with a center frequency of 20GHz, cover a frequency range of 19G to 20.25GHz, realize a waveform slope range of 10 kHz/mus to 220 MHz/mus, and support various modulation types such as triangle wave/sawtooth wave.
In this embodiment, the charge pump pll control voltage generating system 230 generates an analog control voltage signal, and controls the two-point modulation vco system 210 in combination with the analog control voltage signal generated by the dac 220, so as to implement a frequency modulation range less than or equal to 2 GHz.
In this embodiment, the digital-to-analog conversion open-loop control system generates a 32-bits digital control signal by the digital sweep signal generator 250, and realizes a frequency modulation range around 2101 GHz of the two-point modulation voltage-controlled oscillator system by analog voltage through the digital-to-analog converter.
In this embodiment, the digital sweep signal generator 250 generates a 32bits digital control signal, and the Sigma-Delta modulation controls the digitally programmable frequency dividers 440 and 8/9 to achieve a continuously adjustable fractional division ratio.
In this embodiment, the two-point modulation voltage-controlled oscillator system can realize linearized 500MHz/V dual-analog voltage frequency modulation, and meet the frequency modulation range requirement of the system from 19G to 20.25 GHz.
In summary, the frequency modulation continuous wave phase-locked loop system with two-point modulation according to the embodiment constructs a frequency source of a frequency modulation continuous wave, can realize a wider frequency modulation range compared with a traditional phase-locked loop architecture, supports multiple modulation types, is an ideal frequency source of a millimeter wave radar system for the phase-locked loop system, improves the integration level of the millimeter wave radar system, reduces the system cost, and is worthy of popularization and application.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (6)
1. A two-point modulation voltage controlled oscillator, characterized by: the circuit comprises an LC voltage-controlled oscillator, a linearization voltage-controlled circuit and a bias circuit, wherein the bias circuit is connected with the linearization voltage-controlled circuit, the linearization voltage-controlled circuit is connected with the LC voltage-controlled oscillator, the bias voltage required by the linearization voltage-controlled circuit is provided by the bias circuit, and the linearization voltage-controlled circuit controls the frequency of the LC voltage-controlled oscillator according to the control voltage generated by a digital-to-analog converter and the control voltage generated by a phase-locked loop.
2. A phase-locked loop system, characterized by: comprises a control voltage generating system, a digital-to-analog conversion open-loop control system, a continuously adjustable fractional frequency division system, a two-point modulation voltage-controlled oscillator according to claim 1; the continuous adjustable fractional frequency division system, the digital-to-analog conversion open-loop control system and the two-point modulation voltage-controlled oscillator are sequentially connected, the digital-to-analog conversion open-loop control system is connected with the two-point modulation voltage-controlled oscillator, the control voltage generation system performs closed-loop control on the frequency of the two-point modulation voltage-controlled oscillator through a digital control signal, and the digital-to-analog conversion open-loop control system performs open-loop control on the frequency of the two-point modulation voltage-controlled oscillator through a digital control signal.
3. A phase locked loop system according to claim 2, wherein: the control voltage generation system comprises a phase frequency detector, a charge pump and a loop filter which are connected in sequence, the loop filter is connected with one input end of the two-point modulation voltage-controlled oscillator, one input end of the phase frequency detector inputs a reference crystal oscillator signal, and the other input end of the phase frequency detector is connected with the output end of the continuous adjustable fractional frequency division system.
4. A phase locked loop system according to claim 3, wherein: the continuously adjustable fractional frequency division system comprises a high-speed 2 frequency divider, an analog 8/9 frequency divider, a programmable digital frequency divider and a Sigma-Delta modulator, wherein the input end of the high-speed 2 frequency divider is connected with the output end of the two-point modulation voltage-controlled oscillator, the output end of the high-speed 2 frequency divider is connected with the input end of the analog 8/9 frequency divider, the output end of the analog 8/9 frequency divider is connected with the programmable digital frequency divider, a digital control signal containing a frequency division ratio is input into the input end of the Sigma-Delta modulator, the output end of the Sigma-Delta modulator is connected with the programmable digital frequency divider, the programmable digital frequency divider outputs a modulation signal according to the digital control signal to set the analog 8/9 frequency divider to form fractional frequency division, and the output end of the programmable digital frequency divider is connected with one input end of the phase frequency detector.
5. A phase locked loop system according to claim 4, wherein: the digital-to-analog conversion open-loop control system comprises a digital-to-analog converter, wherein a digital control signal is input into the input end of the digital-to-analog converter, and the output end of the digital-to-analog converter is connected with one input end of the two-point modulation voltage-controlled oscillator.
6. A phase locked loop system according to claim 5, wherein: the phase-locked loop system also comprises a digital frequency sweeping signal generator, one path of the digital frequency sweeping signal generator is connected with a fractional frequency divider to control the frequency dividing ratio, and the other path of the digital frequency sweeping signal generator generates an oscillator open-loop control voltage through a digital-to-analog converter.
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