CN216565116U - Ultra-wideband phase-locked loop frequency source - Google Patents
Ultra-wideband phase-locked loop frequency source Download PDFInfo
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Abstract
The utility model relates to the field of phase-locked loops, in particular to an ultra-wideband phase-locked loop frequency source, which solves the problem that the phase demodulation frequency of the feedback end of the existing domestic phase discriminator chip in the ultra-wideband frequency source cannot meet the requirement of the input frequency of the feedback end of the phase discriminator. The utility model relates to an ultra-wideband phase-locked loop frequency source which comprises a phase discriminator, an active loop filter, a voltage-controlled oscillator, a micro-strip coupler and a variable frequency divider, wherein the input end of the phase discriminator receives external input signals, the output end of the phase discriminator is connected with the input end of the active loop filter, the input end of the voltage-controlled oscillator is connected with the output end of the active loop filter, the output end of the voltage-controlled oscillator is connected with the input end of the micro-strip coupler, the output end of the micro-strip coupler outputs signals, the coupling end of the micro-strip coupler is connected with the input end of the variable frequency divider, and the output end of the variable frequency divider is connected with the feedback end of the phase discriminator. The utility model is suitable for the ultra-wideband phase-locked loop.
Description
Technical Field
The utility model relates to the field of phase-locked loops, in particular to an ultra-wideband phase-locked loop frequency source.
Background
The phase demodulation frequency of the feedback end of the existing domestic phase discriminator chip can not meet the requirement of the input frequency of the feedback end of the phase discriminator. For example, when the frequency of the output signal is required to be a broadband of 10GHz-20GHz, the frequency of the output signal is unstable or the broadband of 10GHz-20GHz cannot be output because the input frequency of the feedback end of the phase detector cannot meet the requirement.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide an ultra-wideband phase-locked loop frequency source, which solves the problem that the phase demodulation frequency of the feedback end of the existing domestic phase demodulator chip in the ultra-wideband frequency source cannot meet the requirement of the input frequency of the feedback end of the phase discriminator, and improves the stability of output signals.
The utility model adopts the following technical scheme to realize the purpose, and the ultra-wideband phase-locked loop frequency source comprises a phase discriminator, an active loop filter, a voltage-controlled oscillator, a micro-strip coupler and a variable frequency divider, wherein the input end of the phase discriminator receives external input signals, the output end of the phase discriminator is connected with the input end of the active loop filter, the input end of the voltage-controlled oscillator is connected with the output end of the active loop filter, the output end of the voltage-controlled oscillator is connected with the input end of the micro-strip coupler, the output end of the micro-strip coupler outputs signals, the coupling end of the voltage-controlled oscillator is connected with the input end of the variable frequency divider, and the output end of the variable frequency divider is connected with the feedback end of the phase discriminator.
Furthermore, the ultra-wideband phase-locked loop frequency source also comprises an attenuator, wherein the attenuator is connected between the coupling end of the microstrip coupler and the input end of the variable frequency divider, and the type of the attenuator is HH-AT 40-25.
Furthermore, the ultra-wideband phase-locked loop frequency source also comprises an amplifier, wherein the amplifier is connected between the output end of the attenuator and the input end of the variable frequency divider, and the model of the amplifier is VD 70191.
Furthermore, the model of the variable frequency divider is SID027SP3, and when the output frequency is 15-20GHz, the frequency dividing ratio is 4; and when the output frequency is 10-15GHz, the frequency division ratio is 2.
Furthermore, a separation cavity is arranged between an output feedback signal path of the variable frequency divider and an output path of the voltage-controlled oscillator.
Further, the model of the phase detector is GM 4704B.
Further, the type of the voltage-controlled oscillator is IVO-0408.
The variable frequency divider is adopted to divide the frequency of the output signal of the voltage-controlled oscillator, so that the feedback signal meets the input frequency requirement of the feedback end of the phase discriminator, and the attenuator and the amplifier can jointly act to adjust the power of the feedback end, improve the isolation of the feedback end and improve the stability of the output signal.
Drawings
Fig. 1 is a block diagram of an ultra-wideband phase-locked loop frequency source structure according to the present invention.
FIG. 2 is a schematic diagram of the chamber structure of the present invention.
In the figure, 1 is a compartment, a VCO is a voltage controlled oscillator, and an LPF is a low pass filter.
Detailed Description
The utility model relates to an ultra-wideband phase-locked loop frequency source which comprises a phase discriminator, an active loop filter, a voltage-controlled oscillator, a micro-strip coupler and a variable frequency divider, wherein the input end of the phase discriminator receives external input signals, the output end of the phase discriminator is connected with the input end of the active loop filter, the input end of the voltage-controlled oscillator is connected with the output end of the active loop filter, the output end of the voltage-controlled oscillator is connected with the input end of the micro-strip coupler, the output end of the micro-strip coupler outputs signals, the coupling end of the micro-strip coupler is connected with the input end of the variable frequency divider, and the output end of the variable frequency divider is connected with the feedback end of the phase discriminator.
The ultra-wideband phase-locked loop frequency source also comprises an attenuator which is connected between the coupling end of the microstrip coupler and the input end of the variable frequency divider.
The ultra-wideband phase-locked loop frequency source further comprises an amplifier, and the amplifier is connected between the output end of the attenuator and the input end of the variable frequency divider.
The coupling degree of the microstrip coupler is larger than-15 dB in the range of 10-20 GHz.
When the output frequency of the variable frequency divider is 15-20GHz, the frequency dividing ratio is 4; and when the output frequency is 10-15GHz, the frequency division ratio is 2.
A separation cavity is arranged between an output feedback signal path of the variable frequency divider and an output path of the voltage-controlled oscillator, and radiation of a feedback signal from a space to a main path is reduced.
The utility model is further described below with reference to the accompanying drawings.
FIG. 1 is a block diagram of an ultra-wideband phase-locked loop frequency source according to the present invention, in which an input terminal of a phase discriminator receives an external input signal, an output terminal of the phase discriminator is connected to an input terminal of an active loop filter, an input terminal of a voltage-controlled oscillator is connected to an output terminal of the active loop filter, an output terminal of the voltage-controlled oscillator is connected to an input terminal of a microstrip coupler, an output terminal of the microstrip coupler outputs a signal, a coupling terminal of the microstrip coupler is connected to an input terminal of an attenuator, an input terminal of an amplifier is connected to an output terminal of the attenuator, an output terminal of the amplifier is connected to an input terminal of a variable frequency divider, and an output terminal of the variable frequency divider is connected to a feedback terminal of the phase discriminator;
the phase discriminator compares the phase of the input reference signal with that of the feedback signal to generate error voltage, and the input frequency range of the feedback end of the chip is required to be less than 8 GHz; the active filter filters out high-frequency components of the error voltage output by the phase discriminator, amplifies the error voltage and outputs a clean direct-current voltage signal; the voltage-controlled oscillator generates a radio frequency signal corresponding to the output voltage of the active loop filter; the coupling degree of the microstrip coupler is greater than-15 dB in the range of 10-20GHz, and the output end of the microstrip coupler directly outputs; the attenuator and the amplification chip jointly act to adjust the power of the feedback end and improve the isolation of the feedback end; the variable frequency divider has the frequency dividing ratio of 4 when the output frequency is 15-20GHz and the frequency dividing ratio of 2 when the output frequency is 10-15 GHz; the total isolation of the signal paths of the microstrip coupler, the attenuator, the amplifier and the variable frequency divider is more than 130 dB;
in the specific embodiment of the utility model, a 100MHz reference signal is subjected to phase comparison on the reference signal and a feedback signal through a phase discriminator GM4704B, and an error voltage is generated and sent to a low-pass filter; the voltage-controlled oscillator IVO-0408 generates a 10-20GHz radio frequency signal corresponding to the error voltage; the chip amplifier VD70191 and the chip attenuator HH-AT40-25 jointly act to adjust the power of the feedback end and improve the isolation of the feedback end; the variable frequency divider SID027SP3 divides the frequency of the 10-20GHz signal output by the voltage-controlled oscillator to meet the feedback end of the phase discriminator, and when the output frequency is 15-20GHz, the frequency dividing ratio is 4, and when the output frequency is 10-15GHz, the frequency dividing ratio is 2.
Fig. 2 is a schematic diagram of a cavity structure of the present invention, and a separation cavity 1 is disposed between a feedback signal path from the variable frequency divider to the phase detector and an output path of the VCO, so as to reduce radiation of the feedback signal from the space to the main path. Wherein the signal of the phase detector is output to a low pass filter LPF.
The utility model has the beneficial effects that:
a variable frequency divider is adopted to divide the frequency of the output signal of the voltage-controlled oscillator, so that the feedback signal meets the input frequency requirement of the feedback end of the phase discriminator;
the isolation degree of the feedback branch circuit and the output main circuit is improved by adopting a microstrip coupler;
the isolation between the feedback branch and the output main circuit is improved by adopting a high-isolation high-gain amplifier and a high-attenuation attenuator, and 1/2 and 1/4 subharmonic signals of the output signal of the frequency divider which is reversely connected to the main circuit are reduced;
a bare chip and a packaged chip mixed circuit is adopted, so that the product volume is reduced;
the signal paths adopt a reasonable separate space design, and the radiation of feedback signals from the space to the main path is reduced.
Claims (9)
1. Ultra wide band phase-locked loop frequency source, its characterized in that, including phase discriminator, active loop filter, voltage controlled oscillator, microstrip coupler and variable frequency divider, outside input signal is received to the input of phase discriminator, and the output is connected with active loop filter's input, voltage controlled oscillator's input and active loop filter's output are connected, and voltage controlled oscillator's output is connected with microstrip coupler's input, microstrip coupler's output signal, coupling end and variable frequency divider's input are connected, variable frequency divider output is connected with the feedback end of phase discriminator.
2. The ultra-wideband phase-locked loop frequency source of claim 1, further comprising an attenuator coupled between the coupling terminal of the microstrip coupler and the input terminal of the variable divider.
3. The ultra-wideband phase-locked loop frequency source of claim 2, wherein the attenuator is of the type HH-AT 40-25.
4. The ultra-wideband phase-locked loop frequency source of claim 3, further comprising an amplifier connected between the output of the attenuator and the input of the variable divider.
5. The UWB PLL frequency source of claim 4 wherein the amplifier is model VD 70191.
6. The ultra-wideband phase-locked loop frequency source according to any of claims 1-5, wherein the variable frequency divider is of type SID027SP3, and has a division ratio of 4 at an output frequency of 15-20 GHz; and when the output frequency is 10-15GHz, the frequency division ratio is 2.
7. The UWB PLL frequency source of claim 6 wherein a separation is provided between the output feedback signal path of the variable divider and the output path of the VCO.
8. The ultra-wideband phase-locked loop frequency source of claim 1, wherein the phase detector is of the type GM 4704B.
9. The UWB PLL frequency source of claim 1 wherein the voltage controlled oscillator is model IVO-0408.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122619443.7U CN216565116U (en) | 2021-10-29 | 2021-10-29 | Ultra-wideband phase-locked loop frequency source |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122619443.7U CN216565116U (en) | 2021-10-29 | 2021-10-29 | Ultra-wideband phase-locked loop frequency source |
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| Publication Number | Publication Date |
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| CN216565116U true CN216565116U (en) | 2022-05-17 |
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| CN202122619443.7U Active CN216565116U (en) | 2021-10-29 | 2021-10-29 | Ultra-wideband phase-locked loop frequency source |
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- 2021-10-29 CN CN202122619443.7U patent/CN216565116U/en active Active
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