CN213637720U - Ultra-wideband fine stepping fast frequency hopping source - Google Patents
Ultra-wideband fine stepping fast frequency hopping source Download PDFInfo
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- CN213637720U CN213637720U CN202022802128.3U CN202022802128U CN213637720U CN 213637720 U CN213637720 U CN 213637720U CN 202022802128 U CN202022802128 U CN 202022802128U CN 213637720 U CN213637720 U CN 213637720U
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Abstract
The utility model relates to a fine step frequency source technical field of ultra wide band, concretely relates to fine step fast frequency hopping source of ultra wide band can reduce phase-locked loop frequency hopping time, has expanded the use scene of the fine step frequency source of ultra wide band, has improved the performance of the fine step frequency source of ultra wide band simultaneously. The technical scheme summarizes and does, including first phase-locked loop, second phase-locked loop and ADC/DAC module, the second phase-locked loop includes the phase discriminator, loop filter, voltage controlled oscillator and frequency divider, external input signal exports the phase discriminator of second phase-locked loop behind first phase-locked loop, and voltage controlled oscillator is exported through loop filter again, and voltage controlled oscillator's one way is as output, and another way passes through the feedback signal that the frequency divider is regarded as the phase discriminator, and loop filter exports and is connected with ADC/DAC module between the voltage controlled oscillator, ADC/DAC module is used for setting up the loop voltage of second phase-locked loop with this frequency hopping time that reduces the second phase-locked loop. The utility model is suitable for a fine step frequency source of ultra wide band.
Description
Technical Field
The utility model relates to a fine step frequency source technical field of ultra wide band, concretely relates to fine step fast frequency hopping source of ultra wide band.
Background
With the existing communication requirements and development, the existing ultra-wideband fine stepping frequency source generally adopts a frequency synthesis mode of exciting a PLL by a DDS (direct digital synthesizer), and the frequency synthesis mode has large volume, large power consumption and complex structure and is not suitable for being used in small-volume and low-power-consumption scenes; and the time of frequency hopping of the phase-locked loop cannot be reduced, and the frequency hopping speed cannot be increased, so that the performance and the use scene of the ultra-wideband fine stepping frequency source are limited.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a fine step fast frequency hopping source of ultra wide band, after adding relevant software method, can reduce phase-locked loop frequency hopping time, improve the speed of frequency hopping, the use scene of the fine step frequency hopping source of extension ultra wide band has also improved the performance of the fine step frequency hopping source of ultra wide band simultaneously.
The utility model discloses take following technical scheme to realize above-mentioned purpose, the fine step fast frequency hopping source of ultra wide band, including first phase-locked loop, second phase-locked loop and ADC/DAC module, the second phase-locked loop includes phase discriminator, loop filter, voltage controlled oscillator and frequency divider, and external input signal exports the phase discriminator of second phase-locked loop after first phase-locked loop, and voltage controlled oscillator is exported to rethread loop filter, and voltage controlled oscillator's is all the way as output, and another way passes through the feedback signal of frequency divider as the phase discriminator, and loop filter exports to be connected with ADC/DAC module between the voltage controlled oscillator, ADC/DAC module is used for setting up the frequency hopping time that the loop voltage of second phase-locked loop reduces the second phase-locked loop with this.
Furthermore, in order to optimize the first phase-locked loop, the first phase-locked loop includes a phase detector, a loop filter, a voltage-controlled oscillator and a frequency divider, an external input signal is output to the loop filter through the phase detector, and then is output to the voltage-controlled oscillator through the loop filter, one path of the voltage-controlled oscillator is used as an output, and the other path of the voltage-controlled oscillator is used as a feedback signal of the phase detector through the frequency divider.
Furthermore, in order to improve the frequency of the input signal, the ultra-wideband fine stepping fast frequency hopping source further comprises an amplifier, and the amplifier is connected with the phase discriminator of the first phase-locked loop.
Furthermore, in order to filter various harmonics of the first phase-locked loop, the ultra-wideband fine stepping fast frequency hopping source further comprises a low-pass filter, and the low-pass filter is used for connecting the first phase-locked loop and the second phase-locked loop.
Further, for the sake of volume simplification, the first phase-locked loop is an integrated fractional mode phase-locked loop LMX 2572.
Further, in order to improve the signal bandwidth, the second phase-locked loop is an integer mode phase-locked loop LMX 2595.
Furthermore, in order to reduce stray output signals, the ultra-wideband fine-stepping fast frequency hopping source further comprises a filtering module, wherein the filtering module comprises two single-pole double-throw switches, an electric adjusting filter and a switch filter, and the electric adjusting filter and the switch filter are respectively connected with the two single-pole double-throw switches.
The utility model discloses a two phase-locked loops, first phase-locked loop is equivalent to input phase-locked loop, the second phase-locked loop is equivalent to output phase-locked loop, the loop filter who exports the phase-locked loop exports and is connected with ADC/DAC module between the voltage controlled oscillator, through the corresponding loop voltage value of ADC collection all frequency point lockings, then set up loop voltage initial value through DAC, realized reducing phase-locked loop frequency hopping time, the use scene of the thin step frequency source of ultra wide band has been expanded, the performance of the thin step frequency source of ultra wide band has been improved simultaneously.
Drawings
Fig. 1 is a schematic block diagram of an embodiment of the ultra-wideband fine-stepping fast frequency hopping source of the present invention.
Fig. 2 is a structural block diagram of an embodiment of the ultra-wideband fine-stepping fast frequency hopping source filter module of the present invention.
In the drawing, 1 is a first phase-locked loop, and 2 is a second phase-locked loop.
Detailed Description
The utility model discloses fine step-by-step fast frequency hopping source of ultra wide band, including first phase-locked loop, second phase-locked loop and ADC/DAC module, the second phase-locked loop includes phase discriminator, loop filter, voltage controlled oscillator and frequency divider, and external input signal exports the phase discriminator of second phase-locked loop behind first phase-locked loop, and voltage controlled oscillator is exported to rethread loop filter, and voltage controlled oscillator's all the way is as output, and another way passes through the feedback signal of frequency divider as the phase discriminator, and loop filter exports and is connected with ADC/DAC module between the voltage controlled oscillator, ADC/DAC module is used for setting up the loop voltage of second phase-locked loop with this frequency hopping time that reduces the second phase-locked loop.
The ADC/DAC module collects corresponding loop voltage values when all frequency points are locked through the ADC, and then sets loop voltage initial values through the DAC, so that the frequency hopping time of the output phase-locked loop is greatly reduced.
In order to optimize the first phase-locked loop, the first phase-locked loop comprises a phase detector, a loop filter, a voltage-controlled oscillator and a frequency divider, an external input signal is output to the loop filter through the phase detector and then output to the voltage-controlled oscillator through the loop filter, one path of the voltage-controlled oscillator is used as output, and the other path of the voltage-controlled oscillator is used as a feedback signal of the phase detector through the frequency divider.
In order to improve the frequency of an input signal, the ultra-wideband fine stepping fast frequency hopping source further comprises an amplifier, and the amplifier is connected with the phase discriminator of the first phase-locked loop.
In order to filter various harmonics of the first phase-locked loop, the ultra-wideband fine stepping fast frequency hopping source further comprises a low-pass filter, and the low-pass filter is used for connecting the first phase-locked loop and the second phase-locked loop.
For simplicity of size, the first phase-locked loop is an integrated fractional mode phase-locked loop LMX 2572.
In order to improve the signal bandwidth, the second phase-locked loop is an integer mode phase-locked loop LMX2595, and can generate an ultra-wideband signal of 10MHz-18GHz with 1kHz as step.
In order to reduce stray output signals, the ultra-wideband fine stepping fast frequency hopping source further comprises a filtering module, wherein the filtering module comprises two single-pole double-throw switches, an electric adjusting filter and a switch filter, and the electric adjusting filter and the switch filter are respectively connected with the two single-pole double-throw switches.
The electric tunable filter can filter out signal harmonic waves and far-end stray waves within the frequency range of 10M-2GHz, the switch filter can adopt a switch filter chip to filter out harmonic waves and far-end stray waves within the frequency range of 2-18GHz, and the harmonic waves and the far-end stray waves in the atmosphere of the whole module output frequency range can be filtered out by combining the harmonic waves and the far-end stray waves, so that the harmonic waves and the far-end stray waves are guaranteed to be qualified.
The utility model discloses the principle that sets up the loop voltage of second phase-locked loop with this and reduce the frequency hopping time of second phase-locked loop does, the loop voltage is 0.6V when the phase-locked loop outputs 10MHz locking, the loop voltage is 2.8V when 18GHz locks, gather through the ADC and obtain, 10MHz frequency hopping is to when 18GHz, DAC exports 2.79V voltage in advance, this loop voltage just does not convert to 2.8V from 0.6V, but converts to 2.8V from 2.79V, consequently, make the frequency hopping time reduce, the speed of frequency hopping has been improved.
The above method can be derived from the utility model discloses rational in infrastructure, does not belong to the scope of protection of the utility model.
The utility model discloses an embodiment structural principle block diagram of the fine step-by-step fast frequency hopping source of ultra wide band is as shown in figure 1, the input signal is as the input of the phase discriminator of first phase-locked loop 1 after amplifier amplifies, the loop filter of rethread first phase-locked loop 1 exports voltage controlled oscillator, voltage controlled oscillator's the input as low pass filter all the way, another way passes through the feedback signal of the phase discriminator of frequency divider as first phase-locked loop 1, the output of low pass filter is as the input of the phase discriminator of second phase-locked loop 2, the loop filter of rethread second phase-locked loop 2 exports voltage controlled oscillator, voltage controlled oscillator's the input as filtering module all the way, another way passes through the feedback signal of the phase discriminator as second phase-locked loop 2, the loop filter of second phase-locked loop 2 exports still to be connected with ADC DAC module between the voltage.
An embodiment of the filtering module is shown in fig. 2, and includes two single-pole double-throw switches, an electrically tunable filter, and a switch filter, where the electrically tunable filter and the switch filter are respectively connected to the two single-pole double-throw switches.
To sum up, the utility model discloses can reduce phase-locked loop frequency hopping time, improve the speed of frequency hopping, the use scene of the fine step frequency source of extension ultra wide band has also improved the performance of the fine step frequency source of ultra wide band simultaneously.
Claims (6)
1. The ultra-wideband fine-stepping fast frequency hopping source comprises a first phase-locked loop and is characterized by further comprising a second phase-locked loop and an ADC/DAC module, wherein the second phase-locked loop comprises a phase discriminator, a loop filter, a voltage-controlled oscillator and a frequency divider, external input signals are output to the phase discriminator of the second phase-locked loop after passing through the first phase-locked loop, the voltage-controlled oscillator is output through the loop filter, one path of the voltage-controlled oscillator serves as output, the other path of the voltage-controlled oscillator serves as a feedback signal of the phase discriminator through the frequency divider, the ADC/DAC module is connected between the loop filter and the voltage-controlled oscillator, and the ADC/DAC module is used for setting the loop voltage of the second phase-locked loop so as to reduce the frequency hopping time.
2. The ultra-wideband fine-stepping fast frequency hopping source according to claim 1, wherein the first phase-locked loop comprises a phase detector, a loop filter, a voltage-controlled oscillator and a frequency divider, an external input signal is output to the loop filter through the phase detector and then output to the voltage-controlled oscillator through the loop filter, one path of the voltage-controlled oscillator is used as an output, and the other path of the voltage-controlled oscillator is used as a feedback signal of the phase detector through the frequency divider.
3. The ultra-wideband fine step fast frequency hopping source according to claim 2, further comprising an amplifier connected to the phase detector of the first phase locked loop.
4. The ultra-wideband fine step fast frequency hopping source according to any one of claims 1 to 3, further comprising a low pass filter for connecting the first phase locked loop with the second phase locked loop.
5. The ultra-wideband fine step fast frequency hopping source according to claim 4, wherein said first phase-locked loop is an integrated fractional mode phase-locked loop LMX2572 and said second phase-locked loop is an integer mode phase-locked loop LMX 2595.
6. The ultra-wideband fine-stepping fast frequency hopping source according to claim 1, further comprising a filtering module, wherein the filtering module comprises two single-pole double-throw switches, an electrically tunable filter, and a switch filter, and the electrically tunable filter and the switch filter are respectively connected to the two single-pole double-throw switches.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022802128.3U CN213637720U (en) | 2020-11-27 | 2020-11-27 | Ultra-wideband fine stepping fast frequency hopping source |
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| CN202022802128.3U CN213637720U (en) | 2020-11-27 | 2020-11-27 | Ultra-wideband fine stepping fast frequency hopping source |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115395889A (en) * | 2022-09-05 | 2022-11-25 | 北京中科睿信科技有限公司 | System and method for calibrating and optimizing frequency hopping time by loop preset voltage |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115395889A (en) * | 2022-09-05 | 2022-11-25 | 北京中科睿信科技有限公司 | System and method for calibrating and optimizing frequency hopping time by loop preset voltage |
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