CN113949382A - Regenerative frequency divider with broadband topological structure - Google Patents
Regenerative frequency divider with broadband topological structure Download PDFInfo
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- CN113949382A CN113949382A CN202111273508.5A CN202111273508A CN113949382A CN 113949382 A CN113949382 A CN 113949382A CN 202111273508 A CN202111273508 A CN 202111273508A CN 113949382 A CN113949382 A CN 113949382A
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- 230000001172 regenerating effect Effects 0.000 title claims abstract description 30
- 239000003990 capacitor Substances 0.000 claims description 21
- 239000000126 substance Substances 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000003071 parasitic effect Effects 0.000 description 2
- 230000001629 suppression Effects 0.000 description 2
- 230000002194 synthesizing effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L7/00—Automatic control of frequency or phase; Synchronisation
- H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
- H03L7/16—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop
- H03L7/18—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using a frequency divider or counter in the loop
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K23/00—Pulse counters comprising counting chains; Frequency dividers comprising counting chains
- H03K23/002—Pulse counters comprising counting chains; Frequency dividers comprising counting chains using semiconductor devices
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Abstract
The invention discloses a regenerative frequency divider with a broadband topological structure, which comprises: the first all-pass filter, the second all-pass filter, the third all-pass filter, the fourth all-pass filter, the first mixer, the second mixer and the power synthesizer; the two mixers are used, and the feedback ends of the input port and the output port are respectively driven in an orthogonal mode through a first all-pass filter, a second all-pass filter, a third all-pass filter and a fourth all-pass filter, so that single sideband conversion (SSB) is realized, signals output by the two mixers are synthesized through a power synthesizer, unnecessary upper single frequency is eliminated, and only lower sideband frequency is left. Thus, the lower frequencies of the present invention are not limited by the upper sideband frequency, only the bandwidth of the all-pass filter, thereby providing a regenerative divider in a wideband topology.
Description
Technical Field
The invention relates to a frequency divider, in particular to a regenerative frequency divider with a broadband topological structure.
Background
Frequency dividers have been widely used in modern communication devices to divide a clock signal having a certain frequency to obtain another signal having a lower frequency than the clock signal. Among the commonly used frequency dividers are: varactor dividers, digital dividers, and regenerative dividers, while regenerative dividers have superior phase noise performance compared to varactor dividers and digital dividers.
The basic circuit of the regenerative frequency divider is shown in fig. 1, and the principle is as follows: under appropriate conditions, mixing the input signal with the output signal produces 1/2 at the output of the mixerfin and 3/2 fTwo signal components in, low pass filter LPF filters out at 3/2 fSignal component of in, and 1/2fThe signal component of in is preserved and circulates around the loop, so that the circuit topology can realize high-speed frequency division.
However, the frequency range of the regenerative divider is limited, 1/2 due to the presence of the low pass filter LPFfThe frequency of the in signal component must lie within the pass band of the low pass filter, 3/2fThe frequency of the in signal component must lie outside the passband of the low pass filter if 3/2 at the mixer outputfThe in signal component has a frequency falling within the pass band of the low pass filter, 1/2 thereoffThe in signal component is also limited. Although the mixer uses double sideband conversion (DSB), i.e., one of the two converted sidebands is used and the other is wasted, i.e., half the converted power is lost, resulting in a 3 dB reduction in SNR, this SNR loss cannot be recovered by any amount of post-mixer gain and can have an impact on other circuitry in the future.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, the object of the present invention is to: a regenerative frequency divider of a wideband topology is provided.
A regenerative frequency divider in a wideband topology, comprising: the first all-pass filter, the second all-pass filter, the third all-pass filter, the fourth all-pass filter, the first mixer, the second mixer and the power synthesizer; wherein the content of the first and second substances,
inputting input signals to the first all-pass filter and the second all-pass filter respectively to obtain a first input signal and a second input signal, wherein the first input signal is orthogonal to the second input signal;
the output signals are respectively input to the third all-pass filter and the fourth all-pass filter to obtain a first output signal and a second output signal, and the first output signal is orthogonal to the second output signal;
the first mixer mixes the first input signal with the first output signal and outputs a first mixed signal to the power combiner, the second mixer mixes the second input signal with the second output signal and outputs a second mixed signal to the power combiner, and the power combiner outputs the output signal.
According to a specific embodiment, in the regenerative frequency divider with a wideband topology according to the present invention, the first all-pass filter and the third all-pass filter have the same changed phase, and the second all-pass filter and the fourth all-pass filter have the same changed phase.
According to a specific embodiment, in the regenerative frequency divider having a wideband topology according to the present invention, all-pass filters used in the first, second, third, and fourth all-pass filters have the same structure, and the all-pass filter includes: the circuit comprises an operational amplifier, a first resistor, a second resistor, a third resistor, a first capacitor and a second capacitor; the input end of the first all-pass filter is connected with the inverting end of the operational amplifier sequentially through the first resistor and the first capacitor, and the input end of the first all-pass filter is also connected with the inverting end of the operational amplifier through the second resistor; the output end of the first all-pass filter is the output end of the operational amplifier, the first all-pass filter is connected with the inverting end of the operational amplifier through the third resistor, the second all-pass filter is connected with the first resistor and the first capacitor through the second capacitor, and the non-inverting end of the operational amplifier is grounded through the fourth resistor. And the adjustment of the phase change of the all-pass filter is realized by changing the parameters of the first capacitor and the second capacitor.
According to a specific embodiment, the regenerative frequency divider of the broadband topology of the present invention further comprises a low-pass filter; the power combiner is connected to the low-pass filter, and outputs the output signal via the low-pass filter.
According to a specific embodiment, in the regenerative frequency divider with a broadband topology according to the present invention, the low-pass filter is a stub microstrip low-pass filter.
Compared with the prior art, the invention has the beneficial effects that:
1. the regenerative frequency divider with the broadband topological structure realizes orthogonal driving through the two frequency mixers and the first all-pass filter, the second all-pass filter, the third all-pass filter and the fourth all-pass filter at the feedback ends of the input port and the output port respectively, thereby realizing single sideband conversion (SSB), synthesizing signals output by the two frequency mixers through the power synthesizer, eliminating unnecessary upper single frequency and only leaving lower sideband frequency. Thus, the lower frequencies of the present invention are not limited by the upper sideband frequency, only the bandwidth of the all-pass filter, thereby providing a regenerative divider in a wideband topology.
2. The regenerative frequency divider with the broadband topological structure can improve the suppression effect of the upper single frequency at higher frequency by arranging the low-pass filter. Furthermore, a stub microstrip low-pass filter is adopted, so that the influence of a parasitic passband can be avoided.
Drawings
FIG. 1 is a basic circuit schematic of a regenerative frequency divider;
FIG. 2 is a schematic diagram of a regenerative divider with a wideband topology according to the present invention;
FIG. 3 is a schematic diagram of an all-pass filter employed in the present invention;
fig. 4 is a schematic diagram of an implementation structure of the regenerative frequency divider with the wideband topology of the present invention.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.
As shown in fig. 2, the regenerative frequency divider of the wideband topology of the present invention includes: the first all-pass filter, the second all-pass filter, the third all-pass filter, the fourth all-pass filter, the first mixer, the second mixer and the power synthesizer; wherein the content of the first and second substances,
input signal finRespectively inputting the signals into the first all-pass filter and the second all-pass filter to obtain a first input signal fin(90 °) and a second input signal fin(0°)；
Output signal foutRespectively input to the third all-pass filter and the fourth all-pass filter to obtain a first output signal fout(90 °) and a second output signal fout (0°)；
The first mixer is used for the first input signal fin(90 °) from the first output signal fout(90 °) mixing, and outputting a first mixing signal to the power combiner, wherein the second mixer is used for mixing the second input signal fin(0 °) and the second output signal fout(0 °) mixing and outputting a second mixing signal to the power combiner, and outputting the output signal f by the power combinerout。
In a specific implementation, the first all-pass filter and the third all-pass filter change the same phase, and the second all-pass filter and the fourth all-pass filter change the same phase. The first all-pass filter, the second all-pass filter, the third all-pass filter, and the fourth all-pass filter have the same all-pass filter structure.
As shown in fig. 3, the structure of the all-pass filter includes: an operational amplifier U1, a first resistor R1, a second resistor R2, a third resistor R3, a first capacitor C1 and a second capacitor C2; the input end IN of the first all-pass filter is connected with the inverting end of the operational amplifier U1 through the first resistor R1 and the first capacitor C1 IN sequence, and is further connected with the inverting end of the operational amplifier U1 through the second resistor R2; the output end OUT of the first all-pass filter is the output end of the operational amplifier U1, and is connected to the inverting terminal of the operational amplifier U1 through the third resistor R3, and is connected to the first resistor R1 and the first capacitor C1 through the second capacitor C2, and the non-inverting terminal of the operational amplifier U1 is grounded through the fourth resistor R4. The adjustment of the phase change of the all-pass filter is realized by changing the parameters of the first capacitor C1 and the second capacitor C2; the first capacitor C1 and the second capacitor C2 have the same parameters.
The regenerative frequency divider with the broadband topological structure realizes orthogonal driving through the two frequency mixers and the first all-pass filter, the second all-pass filter, the third all-pass filter and the fourth all-pass filter at the feedback ends of the input port and the output port respectively, thereby realizing single sideband conversion (SSB), synthesizing signals output by the two frequency mixers through the power synthesizer, eliminating unnecessary upper single frequency and only leaving lower sideband frequency. Thus, the lower frequencies of the present invention are not limited by the upper sideband frequency, only the bandwidth of the all-pass filter, thereby providing a regenerative divider in a wideband topology.
As shown in fig. 4, an implementation structure of the regenerative frequency divider with a wideband topology according to the present invention is based on fig. 2, and further includes a low-pass filter to improve the suppression effect of the upper single frequency at higher frequencies. Furthermore, the low-pass filter is a stub microstrip low-pass filter, and can avoid the influence of a parasitic passband.
Claims (5)
1. A regenerative frequency divider in a wideband topology, comprising: the first all-pass filter, the second all-pass filter, the third all-pass filter, the fourth all-pass filter, the first mixer, the second mixer and the power synthesizer; wherein the content of the first and second substances,
inputting input signals to the first all-pass filter and the second all-pass filter respectively to obtain a first input signal and a second input signal, wherein the first input signal is orthogonal to the second input signal;
the output signals are respectively input to the third all-pass filter and the fourth all-pass filter to obtain a first output signal and a second output signal, and the first output signal is orthogonal to the second output signal;
the first mixer mixes the first input signal with the first output signal and outputs a first mixed signal to the power combiner, the second mixer mixes the second input signal with the second output signal and outputs a second mixed signal to the power combiner, and the power combiner outputs the output signal.
2. The regenerative divider of one wideband topology of claim 1, wherein said first all-pass filter is phase-shifted with respect to said third all-pass filter, and wherein said second all-pass filter is phase-shifted with respect to said fourth all-pass filter.
3. The regenerative divider of claim 2, wherein the first all-pass filter, the second all-pass filter, the third all-pass filter, and the fourth all-pass filter are all-pass filters having a common structure, the all-pass filter comprising: the circuit comprises an operational amplifier, a first resistor, a second resistor, a third resistor, a first capacitor and a second capacitor; the input end of the first all-pass filter is connected with the inverting end of the operational amplifier sequentially through the first resistor and the first capacitor, and the input end of the first all-pass filter is also connected with the inverting end of the operational amplifier through the second resistor; the output end of the first all-pass filter is the output end of the operational amplifier, the first all-pass filter is connected with the inverting end of the operational amplifier through the third resistor, the second all-pass filter is connected with the first resistor and the first capacitor through the second capacitor, and the non-inverting end of the operational amplifier is grounded through the fourth resistor.
4. The regenerative divider of a wideband topology of claim 3, further comprising a low pass filter; the power combiner is connected to the low-pass filter, and outputs the output signal via the low-pass filter.
5. The regenerative frequency divider of claim 4, wherein the low pass filter is a stub microstrip low pass filter.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111273508.5A CN113949382A (en) | 2021-10-29 | 2021-10-29 | Regenerative frequency divider with broadband topological structure |
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| CN202111273508.5A CN113949382A (en) | 2021-10-29 | 2021-10-29 | Regenerative frequency divider with broadband topological structure |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1723610A (en) * | 2003-01-08 | 2006-01-18 | 塞瑞费克无线公司 | Regenerative divider for up and down conversion of radio frequency (RF) signals |
| US20080164916A1 (en) * | 2007-01-09 | 2008-07-10 | General Instrument Corporation | Broadband Low Noise Complex Regenerative Frequency Dividers |
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- 2021-10-29 CN CN202111273508.5A patent/CN113949382A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1723610A (en) * | 2003-01-08 | 2006-01-18 | 塞瑞费克无线公司 | Regenerative divider for up and down conversion of radio frequency (RF) signals |
| US20080164916A1 (en) * | 2007-01-09 | 2008-07-10 | General Instrument Corporation | Broadband Low Noise Complex Regenerative Frequency Dividers |
Non-Patent Citations (1)
| Title |
|---|
| 高迎霞等: "电子电流互感器高压侧电路设计的改进", 电气应用, vol. 26, no. 1, 31 December 2007 (2007-12-31), pages 104 - 107 * |
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