CN207939498U - A kind of Low phase noise frequency synthesizer - Google Patents
A kind of Low phase noise frequency synthesizer Download PDFInfo
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- CN207939498U CN207939498U CN201821123464.1U CN201821123464U CN207939498U CN 207939498 U CN207939498 U CN 207939498U CN 201821123464 U CN201821123464 U CN 201821123464U CN 207939498 U CN207939498 U CN 207939498U
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Abstract
The utility model discloses a kind of Low phase noise frequency synthesizers, circuit occurs including reference signal, the reference signal occurs work(after the reference signal that circuit generates enters module and divides two-way, the phase discriminator for entering phase-locked loop circuit all the way carries out phase demodulation, another way carries out harmonic generation circuit and carries out local oscillator of the frequency multiplication as feedback mixing, so that the Fractional-N frequency value of feedback is 1, phase discriminator exports loop voltage, loop voltage exports the frequency that burning voltage controls the first voltage controlled oscillator output Low phase noise after loop filter, the mixing locking phase that the frequency is carried out to second-order obtains the rate-adaptive pacemaker of final Low phase noise.The utility model is that signal is synthesized the broadband of 9.4G~15.45G, the signal source of low phase noise, general system level requirement can be met, local oscillation signal can be provided for system, also can be used as self-test signal source and used, is widely used in on the higher product of phase noise requirements.
Description
Technical field
The utility model belongs to signal synthesis device technical field, more particularly to a kind of Low phase noise frequency synthesizer.
Background technology
With the rapid development of electronic information technology, the sophisticated signal of various high quality, another party on the one hand should be generated
Face again accurately measures sophisticated signal, and either the generation of signal or signal are analyzed, and all be unable to do without electronics and sets
Standby core component --- frequency synthesizer.High performance frequency synthesizer is the pith of contemporary electronic systems equipment, extensively
It is general to be applied in the equipment such as present mobile communication, phased-array radar and high-end electronic measuring instrument, its equipment to electronic system
Performance plays conclusive effect.Such as number of patent application is 201220269914.4《A kind of super Low phase noise frequency source of Ku wave bands
Component》It is middle to obtain frequency source by the way of the filtering of switch filtering component, but in this manner frequency synthesis scheme compared with
For complexity, there are circuit structure is complicated and the defects of volume is big.
Therefore, how solve the above problems the emphasis studied as those skilled in the art.
Utility model content
The purpose of this utility model is just to provide a kind of Low phase noise frequency synthesizer, can effectively solve foregoing circuit complexity and
Bulky shortcoming.
The purpose of this utility model is realized by following technical proposals：
A kind of Low phase noise frequency synthesizer, including External Reference signal circuit, harmonic oscillator, sound table, the first amplifier,
One frequency mixer, the first phase discriminator, the first loop filter, the first voltage controlled oscillator, the second amplifier, frequency multiplier, the second mixing
One end of device, frequency divider, the second phase discriminator, the second loop filter, the second voltage controlled oscillator, the External Reference signal circuit connects
Harmonic oscillator is connect, the other end of External Reference signal circuit connects the first phase discriminator, and the harmonic oscillator connection sound table is described
Sound table connects the first amplifier, and first amplifier connects the first frequency mixer, and first frequency mixer connects the first phase discriminator
With the first voltage controlled oscillator, first phase discriminator connects the first loop filter, the first loop filter connection first
Voltage controlled oscillator, first voltage controlled oscillator connect the second amplifier and frequency divider, and second amplifier connects frequency multiplier,
The frequency multiplier connects the second frequency mixer, and second frequency mixer connects the second phase discriminator and the second voltage controlled oscillator, and described the
Two phase discriminators connect frequency divider and the second loop filter, and second loop filter connects the second voltage controlled oscillator.
Preferably, the signal frequency of the External Reference signal circuit is 100MHz.
Preferably, the output signal frequency of first voltage controlled oscillator is 3250MHz.
Preferably, the frequency divider is two-divider.
Preferably, the frequency multiplier is varactor doubler.
Preferably, the amplification range of first amplifier is DC-4GHz, the amplification range of second amplifier is
DC-5GHz。
Preferably, the multiple that the harmonic oscillator carries out process of frequency multiplication is 32.
Compared with prior art, the beneficial effects of the utility model are：
The utility model can utilize the phase-locked loop circuit of two mixing types, in conjunction with voltage controlled oscillator, frequency multiplier, frequency dividing
Device etc., is not only successfully realized that output frequency band is wide, frequency spectrum output characteristic of low phase noise, and circuit structure it is simple,
It is small.
Description of the drawings
Fig. 1 is the circuit structure diagram of the utility model.
Reference sign：1- External Reference signal circuits, 2- harmonic oscillators, the first phase discriminators of 3-, 4- sound tables, 5- first
Amplifier, the first frequency mixers of 6-, the first loop filters of 7-, the first voltage controlled oscillators of 8-, the second amplifiers of 9-, 10- frequency dividers,
11- frequency multipliers, the second frequency mixers of 12-, the second phase discriminators of 13-, the second loop filters of 14-, the second voltage controlled oscillators of 15-.
Specific implementation mode
The utility model is further described with reference to specific embodiments and the drawings.
Embodiment one
As shown in Figure 1, a kind of Low phase noise frequency synthesizer, including External Reference signal circuit 1, harmonic oscillator 2, sound table 4,
First amplifier 5, the first frequency mixer 6, the first phase discriminator 3, the first loop filter 7, the amplification of the first voltage controlled oscillator 8, second
Device 9, frequency multiplier 11, the second frequency mixer 12, frequency divider 10, the second phase discriminator 13, the second loop filter 14, the second voltage controlled oscillation
Device 15, the output signal frequency of first voltage controlled oscillator 8 are 3250MHz, and the frequency divider 10 is two-divider, described times
Frequency device 11 is varactor doubler, and the amplification range of first amplifier 5 is DC-4GHz, the amplification range of second amplifier 9
It is DC-5GHz, the multiple that the harmonic oscillator 2 carries out process of frequency multiplication is 32, and one end of the External Reference signal circuit 1 connects
Harmonic oscillator 2, the other end the first phase discriminator 3 of connection of External Reference signal circuit 1,2 connection sound table 4 of the harmonic oscillator,
The sound table 4 connects the first amplifier 5, and first amplifier 5 connects the first frequency mixer 6, the connection of the first frequency mixer 6 the
One phase discriminator 3 and the first voltage controlled oscillator 8, first phase discriminator 3 connect the first loop filter 7, the first loop filter
Wave device 7 connects the first voltage controlled oscillator 8, and first voltage controlled oscillator 8 connects the second amplifier 9 and frequency divider 10, and described the
Two amplifiers 9 connect frequency multiplier 11, and the frequency multiplier 11 connects the second frequency mixer 12, second mirror of the connection of the second frequency mixer 12
Phase device 13 and the second voltage controlled oscillator 15, second phase discriminator 13 connects frequency divider 10 and the second loop filter 14, described
Second loop filter 14 connects the second voltage controlled oscillator 15, and External Reference signal circuit 1 generates External Reference signal, External Reference signal
Be divided into after two-way all the way enter phase-locked loop circuit the first phase discriminator 3 carry out phase demodulation, another way enter harmonic oscillator 2 into
Row frequency multiplication is mixed local oscillation signal as the feedback of the first frequency mixer 6 so that the Fractional-N frequency value of feedback is 1, the output of the first phase discriminator 3
Loop voltage, loop voltage export burning voltage the first voltage controlled oscillator 8 of control after the first loop filter 7 and export low phase
The frequency made an uproar, the frequency are divided into two-way into second phase-locked loop circuit, all the way enter frequency multiplier 11 carry out frequency multiplication, another way into
Enter frequency divider 10 to be divided, into the divided processing of signal of frequency divider 10 after enter back into 13 phase demodulation of the second phase discriminator, enter
Feedback local oscillation signal of the signal of frequency multiplier 11 as the second frequency mixer 12 so that the Fractional-N frequency value of feedback is 1, the second phase discriminator
13 output loop voltages, loop voltage export burning voltage after the second loop filter 14 and control the second voltage controlled oscillator 15
Output bandwidth is wide, Low phase noise frequency.
In the present embodiment, using two mixing type phase-locked loop circuits, the frequency signal with wide Low phase noise sound is obtained, electricity
Road is simple, small.
Embodiment two
As shown in Figure 1, a kind of Low phase noise frequency synthesizer, including External Reference signal circuit 1, harmonic oscillator 2, sound table 4,
First amplifier 5, the first frequency mixer 6, the first phase discriminator 3, the first loop filter 7, the amplification of the first voltage controlled oscillator 8, second
Device 9, frequency multiplier 11, the second frequency mixer 12, frequency divider 10, the second phase discriminator 13, the second loop filter 14, the second voltage controlled oscillation
Device 15, the output signal frequency of first voltage controlled oscillator 8 are 3250MHz, and the frequency divider 10 is two-divider, described times
Frequency device 11 is varactor doubler, and the amplification range of first amplifier 5 is DC-4GHz, the amplification range of second amplifier 9
It is DC-5GHz, the multiple that the harmonic oscillator 2 carries out process of frequency multiplication is 32, and one end of the External Reference signal circuit 1 connects
Harmonic oscillator 2, the other end the first phase discriminator 3 of connection of External Reference signal circuit 1,2 connection sound table 4 of the harmonic oscillator,
The sound table 4 connects the first amplifier 5, and first amplifier 5 connects the first frequency mixer 6, the connection of the first frequency mixer 6 the
One phase discriminator 3 and the first voltage controlled oscillator 8, first phase discriminator 3 connect the first loop filter 7, the first loop filter
Wave device 7 connects the first voltage controlled oscillator 8, and first voltage controlled oscillator 8 connects the second amplifier 9 and frequency divider 10, and described the
Two amplifiers 9 connect frequency multiplier 11, and the frequency multiplier 11 connects the second frequency mixer 12, second mirror of the connection of the second frequency mixer 12
Phase device 13 and the second voltage controlled oscillator 15, second phase discriminator 13 connects frequency divider 10 and the second loop filter 14, described
Second loop filter 14 connects the second voltage controlled oscillator 15, and External Reference signal circuit 1 generates the External Reference signal of 100MHz, outside
Reference signal is divided into the first phase discriminator 3 progress phase demodulation that two-way enters phase-locked loop circuit all the way after entering, another way enters harmonic wave
Generator 2 carries out frequency multiplication and is mixed local oscillation signal as the feedback of the first frequency mixer 6 so that the Fractional-N frequency value of feedback is 1, the first mirror
Phase device 3 exports loop voltage, and loop voltage exports burning voltage after the first loop filter 7 and controls the first voltage controlled oscillator
The frequency of 8 output Low phase noises, the frequency are divided into two-way into second phase-locked loop circuit, enter frequency multiplier 11 all the way and carry out again
Frequently, another way enters frequency divider 10 and is divided, into the divided processing of signal of frequency divider 10 after enter back into the second phase discriminator
13 phase demodulations, into feedback local oscillation signal of the signal as the second frequency mixer 12 of frequency multiplier 11 so that the Fractional-N frequency value of feedback is 1,
Second phase discriminator 13 exports loop voltage, and loop voltage exports the second pressure of burning voltage control after the second loop filter 14
Control that 15 output bandwidth of oscillator is wide, frequency of Low phase noise.
In the present embodiment, it is used as using the signal of 100MHz and refers to signal, it is easier to generate the frequency signal of Low phase noise sound.
The above is only the preferred embodiment of the utility model only, is not intended to limit the utility model, all at this
All any modification, equivalent and improvement etc., should be included in the utility model made by within the spirit and principle of utility model
Protection domain within.
Claims (7)
1. a kind of Low phase noise frequency synthesizer, it is characterised in that：Including External Reference signal circuit, harmonic oscillator, sound table, first
Amplifier, the first frequency mixer, the first phase discriminator, the first loop filter, the first voltage controlled oscillator, the second amplifier, frequency multiplier,
Second frequency mixer, frequency divider, the second phase discriminator, the second loop filter, the second voltage controlled oscillator, the External Reference signal circuit
One end connect harmonic oscillator, the other end of External Reference signal circuit connects the first phase discriminator, the harmonic oscillator connection
Sound table, the sound table connect the first amplifier, and first amplifier connects the first frequency mixer, the first frequency mixer connection the
One phase discriminator and the first voltage controlled oscillator, first phase discriminator connect the first loop filter, first loop filter
The first voltage controlled oscillator is connected, first voltage controlled oscillator connects the second amplifier and frequency divider, and second amplifier connects
Frequency multiplier is connect, the frequency multiplier connects the second frequency mixer, and second frequency mixer connects the second phase discriminator and the second voltage controlled oscillation
Device, the second phase discriminator connection frequency divider and the second loop filter, the second loop filter connection second is voltage-controlled to shake
Swing device.
2. a kind of Low phase noise frequency synthesizer according to claim 1, it is characterised in that：The External Reference signal circuit
Signal frequency is 100MHz.
3. a kind of Low phase noise frequency synthesizer according to claim 1, it is characterised in that：First voltage controlled oscillator
Output signal frequency is 3250MHz.
4. a kind of Low phase noise frequency synthesizer according to claim 1, it is characterised in that：The frequency divider is two divided-frequency
Device.
5. a kind of Low phase noise frequency synthesizer according to claim 1, it is characterised in that：The frequency multiplier is two frequencys multiplication
Device.
6. a kind of Low phase noise frequency synthesizer according to claim 1, it is characterised in that：The amplification of first amplifier
Range is DC-4GHz, and the amplification range of second amplifier is DC-5GHz.
7. a kind of Low phase noise frequency synthesizer according to claim 1, it is characterised in that：The harmonic oscillator carries out again
The multiple of frequency processing is 32.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821123464.1U CN207939498U (en) | 2018-07-16 | 2018-07-16 | A kind of Low phase noise frequency synthesizer |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201821123464.1U CN207939498U (en) | 2018-07-16 | 2018-07-16 | A kind of Low phase noise frequency synthesizer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110729996A (en) * | 2019-11-12 | 2020-01-24 | 中电科仪器仪表有限公司 | Phase-locked loop circuit and method for miniaturization double phase locking |
| CN115347868A (en) * | 2022-10-20 | 2022-11-15 | 深圳市鼎阳科技股份有限公司 | Signal generating apparatus and signal generating method for generating low phase noise signal |
-
2018
- 2018-07-16 CN CN201821123464.1U patent/CN207939498U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110729996A (en) * | 2019-11-12 | 2020-01-24 | 中电科仪器仪表有限公司 | Phase-locked loop circuit and method for miniaturization double phase locking |
| CN115347868A (en) * | 2022-10-20 | 2022-11-15 | 深圳市鼎阳科技股份有限公司 | Signal generating apparatus and signal generating method for generating low phase noise signal |
| CN115347868B (en) * | 2022-10-20 | 2022-12-13 | 深圳市鼎阳科技股份有限公司 | Signal generating apparatus and signal generating method for generating low phase noise signal |
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