CN105306051A - Broadband phase-locked source with small volume and low phase noise - Google Patents
Broadband phase-locked source with small volume and low phase noise Download PDFInfo
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- CN105306051A CN105306051A CN201510814279.1A CN201510814279A CN105306051A CN 105306051 A CN105306051 A CN 105306051A CN 201510814279 A CN201510814279 A CN 201510814279A CN 105306051 A CN105306051 A CN 105306051A
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Abstract
The invention relates to a broadband phase-locked source with small volume and low phase noise. The phase-locked source comprises a reference driving amplification circuit, a phase discriminator, an active loop filter, a voltage-controlled oscillator, an attenuator, a power divider, a driving amplifier, an amplifier, a high-pass filter and a frequency divider, wherein the reference driving amplification circuit, the phase discriminator, the active loop filter, the voltage-controlled oscillator, the attenuator, the power divider, the high-pass filter and the frequency divider are connected in sequence, and the frequency divider is connected to the phase discriminator; and the power divider, the driving amplifier and the amplifier are connected in sequence. The broadband phase-locked source with small volume and low phase noise, which is provided by the invention, has the remarkable advantages that (1) the output phase noise is low and the noise floor is low; (2) the volume is small, and a micro-assembly technology for a direct phase-locked source and a non-packed chip is adopted; (3) the working band is wide; (4) the frequency step is small; and (5) the output power is high, and an amplifier chip with high gain and high saturated output power is adopted, so that the requirements for actual application can be well met.
Description
Technical field
The invention belongs to broadband phase locked source technical field, be specifically related to the broadband phase locked source of a kind of small size, Low phase noise.
Background technology
Broadband phase locked source is a kind of electronic unit be mainly used in communication, radar, electronic countermeasures and guidance instrument isoelectronic series system equipment.In microwave receiving front-end circuit, broadband phase locked source is one of critical piece of its microwave frequency conversion and signal self-inspection, and the key technical indexes describing this properties of product has: 1) operational frequency bandwidth; 2) power output; 3) spuious; 4) phase noise; 5) circuit size; 6) power consumption.The like product of present broadband phase locked source, one takes frequency mixer and phase locked source Mixed Design scheme, the phase noise of this scheme in 10-20GHz frequency can accomplish-90dBc/Hz1kHz, and shortcoming is that circuit structure is complicated, volume is large, power consumption is high, cost intensive; Another is that the phase noise of this scheme in 10-20GHz frequency can only accomplish-80dBc/Hz1kHz, and shortcoming is poor phase noise by direct phase locked source scheme.
Summary of the invention
For above-mentioned problems of the prior art, the object of the present invention is to provide and a kind ofly avoid occurring the small size of above-mentioned technological deficiency, the broadband phase locked source of Low phase noise.
In order to realize foregoing invention object, the technical solution used in the present invention is as follows:
A broadband phase locked source for small size, Low phase noise, comprises referenced drive amplifying circuit, phase discriminator, active loop filter, voltage controlled oscillator, attenuator, power splitter, driving amplifier, amplifier, high pass filter and frequency divider, wherein:
Described referenced drive amplifying circuit, phase discriminator, active loop filter, voltage controlled oscillator, attenuator, power splitter, high pass filter are connected successively with frequency divider, and described frequency divider is connected with described phase discriminator;
Described power splitter, described driving amplifier are connected successively with described amplifier.
Further, described power splitter is two power splitters.
Further, described frequency divider is four-divider.
Further, described broadband phase locked source also comprises power control circuit.
The broadband phase locked source of small size provided by the invention, Low phase noise, its remarkable advantage is: 1) export phase noise low, noise floor is low; 2) volume is little, have employed the microwave assembly technology of direct phase locked source and naked packaged chip; 3) working band is wide, and output frequency is 10-20GHz; 4) frequency step is little, and frequency step is 10MHz; 5) power output is high, have employed the amplifier chip of high-gain high saturation output power, can meet the needs of practical application well.
Accompanying drawing explanation
Fig. 1 is circuit structure block diagram of the present invention;
Fig. 2 is the circuit theory diagrams of referenced drive amplifying circuit;
Fig. 3 is the circuit theory diagrams of phase discriminator;
Fig. 4 is the circuit theory diagrams that active loop filter is connected with voltage controlled oscillator;
Fig. 5 is micro-assembling circuit schematic diagram of the present invention;
Fig. 6 is the circuit theory diagrams of four-divider;
Fig. 7 is the circuit theory diagrams of power control circuit.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with the drawings and specific embodiments, the present invention will be further described.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
As shown in Figure 1, the broadband phase locked source of a kind of small size, Low phase noise, comprise phase discriminator, active loop filter (VCO), voltage controlled oscillator, attenuator, power splitter, driving amplifier, amplifier, high pass filter and frequency divider, wherein: described phase discriminator, active loop filter, voltage controlled oscillator, attenuator, power splitter, high pass filter are connected successively with frequency divider, and described frequency divider is connected with described phase discriminator; Described power splitter, described driving amplifier are connected successively with described amplifier.Described power splitter is two power splitters.Described frequency divider is four-divider.Described broadband phase locked source also comprises power control circuit.Described power control circuit is connected with frequency divider with phase discriminator, voltage controlled oscillator, driving amplifier, amplifier respectively.Power control circuit provides electric energy for whole broadband phase locked source.
Input reference frequency of the present invention is 100MHz, and input power is 0 ± 3dBm, and input phase noise is less than or equal to-150dBc/Hz1kHz; Phase locked source output frequency is 10-20GHz, and other the key technical indexes have: 1) power output is more than or equal to 15dBm; 2) frequency step is 10MHz; 3) phase noise is less than or equal to-90dBc/Hz1kHz; 4) spuiously-65dBc is less than or equal to; 5) size 45.5 × 54.5 × 15 millimeters.
As shown in Figure 2, the reference frequency 100MHz of input power 0 ± 3dBm is amplified by amplifier U1, and U1 selects NBB300, gain >=13dB, ensure the output >=8dBm of reference frequency, this is the minimum value of phase discriminator phase noise to reference frequency power, and reference frequency exports from A point.
As shown in Figure 3, A point in Fig. 3 is connected with the A point in Fig. 2, phase discriminator U4 selects the HMC704LP4E of ANALOG company, this working frequency of chip is up to 8GHz, under fractional mode, normalization noise floor is-230dBc/Hz, phase demodulation frequency is up to 100MHz, the near-end phase noise of the output of phase discriminator is by normalization noise floor, phase demodulation frequency, output frequency determines, under the condition that output frequency is fixing, the lower phase demodulation frequency of normalization noise floor is higher, the phase noise exported is less, in the present invention, the phase demodulation frequency 100MHz of phase discriminator, control the B-mode (phase discriminator divides A pattern and B-mode at fractional mode) that phase discriminator is operated in fractional mode.The phase noise of theory calculate phase discriminator when exporting 20GHz exports and is:
F
PLL＝F
fm+20log10(f
vco)-10log10(f
pd)＝-230+206-80＝104dBc/Hz1kHz，
Wherein, F
pLLfor the phase noise of phase discriminator, F
fmfor HMC704LP4E normalization noise floor, f
vcothe output frequency of voltage controlled oscillator, f
pdthe reference frequency of phase discriminator.
The reference frequency input of the phase discriminator build-out resistor R3 of 100 ohm matches ground, and phase discriminator compares the frequency N fed back from Fig. 6 (reverse signal) and P (forward signal) and produces phase demodulation electric current and to hold from the CP of Fig. 3 and flow out with phase demodulation frequency.
The CP of Fig. 3 holds the CP input of connection layout 4, resistance R4 in Fig. 4, R5, R6, electric capacity C6, C7, C9, C10 and operational amplifier U2 forms active loop filter, its effect one filters phase discriminator to export the upper parasitic stray produced, two is held by CP the phase demodulation current conversion exported to be the tuning end that tuning voltage controls voltage controlled oscillator U3, the phase noise active loop filter loop bandwidth Design taking into account 10kHz and 100kHz is 300kHz, the OP284ESZ that operational amplifier U2 noise is low, the power supply of U2 is-5V and+24V, R1=R2=1000 Ω in Fig. 4, reference voltage is provided to operational amplifier U2, R4 is 1000 Ω, R5 is 180 Ω, R6 is 240 Ω, C7 is 100Pf, C9 is 6.8nF, C10 is 200pF, C6 is 180pF.In Fig. 4, voltage controlled oscillator U3 is HMC733LC4B, operating frequency 10-20GHz, operating voltage+5V, and frequency VCO end from Fig. 4 of tuning voltage scope-2 ~+24V, voltage controlled oscillator U3 exports.
In Fig. 4, VCO end exports the VCO end of connection layout 5, undersized naked packaged chip selected by the device of Fig. 5, effectively reduce the size of broadband phase locked source, VCO termination U5 attenuator in Fig. 5, the model of attenuator is ATN3590-2, be of a size of 0.686 × 0.737 millimeter, its effect is the output standing wave of voltage controlled oscillator U3 in match map 4.In Fig. 5, U5 exports and connects U9 power splitter, model is BW494, be of a size of 1.01x0.8x0.1mm, operating frequency is 6-20GHz, isolation >=15dB, and its effect VCO is outputed signal merit to divide two-way to export, one road signal enters U6 input in feedback branch Fig. 5, U6 is high pass filter, and model is BWHF-8G, and its performance characteristics is: 1) band connection frequency is 8 ~ 20GHz; 2) pass band insertion loss :≤3.0dB; 3) stopband attenuation: >=20dB6.8GHz; >=40dB6.2GHz; 4) standing-wave ratio :≤1.5.Four-divider in the output connection layout 6 of high pass filter, operating frequency is 10-20GHz, after four frequency divisions, export 2.5-5GHz, and the effect of high pass filter is filter 2.5-5GHz that frequency divider oppositely reveals spuious.The other road signal of power splitter enters the U7 input in Fig. 5, and U7 model is HMC462 amplifier, size 3.0x1.3x0.1mm, gain 15dB, saturation power 15dBm, and effect is by signal drive amplification, is that afterbody amplifier U8 enters saturation power output.Signal after amplification enters the U8 in Fig. 5, U8 model is HMC451 amplifier, be of a size of 1.35x1.35x0.1mm, gain is 20dB, saturation output power is output power output after U9 power splitter of 22dBm, VCO is-6dBm, after U7 amplifies, export 9dBm, so the saturated 22dBm of amplifier U8 exports, the 15dBm being greater than requirement exports.
Export from B end after high pass filter U6 filtering in Fig. 5, be connected to the B end of Fig. 6, the U10 of Fig. 6 is four-divider, model is ADF5001BCPZ, signal single ended input difference output, input power requires-10dBm ~+10dBm, difference output power >=-10dBm, meets the differential feedback input power requirement of phase discriminator U4 in Fig. 3.The reverse leakage of ADF5001BCPZ is-60dBm, output-100dBm after U6 high-pass filtering in Fig. 5, in Fig. 5, the isolation of U9 power splitter becomes-115dBm again, output-80dBm after amplifying 35dB through U7, U8 in Fig. 5, it is-80dBm that four frequency divisions spuious is leaked to phase locked source output power, meets spuious index request.The differential signal N of the U10 of Fig. 6 holds and N end and P end in P end difference corresponding diagram 3, makes the signal after frequency division be input to the radio-frequency (RF) FEEDBACK input of phase discriminator.
In the power supply of Fig. 2 to Fig. 6 and Fig. 3, the serial load mode of phase discriminator is all completed by Fig. 7 control circuit, broadband phase locked source module is powered by+6V ,-5V ,+25V, composition graphs 7, the ripple of+25V input on the magnetic bead filter power supply of L2 in Fig. 7, input low-dropout regulator U14, U14 model LT3060LTS, output ripple is little, noise is low, voltage stabilizing exports to+24V, powers to the U2 in Fig. 4.The ripple of+6V input on the magnetic bead filter power supply of L1 in Fig. 7, be input to U12 voltage stabilizing and export to+5V, U12 model is ADM7150ARDZ-5.0-R7, and output ripple is little, noise is low, and in module, all+5V are from given here.U11 pressurizer ADP150AUJZ-3.3-R7 powers the 3.3V that+5V voltage stabilizing is exported in Fig. 3 to 3.3V.Microcontroller U13 in Fig. 7 adopts ATMEGA8L-8AU, and one is receive outside FREQUENCY CONTROL code by SPI (serial control bus); Two is by LE, DATA, CLK corresponding in LE, DATA, CLK connection layout 3, and the register loading U4 in Fig. 3 controls output frequency.
The broadband phase locked source of small size provided by the invention, Low phase noise, its remarkable advantage is: 1) export phase noise low, noise floor is low; 2) volume is little, have employed the microwave assembly technology of direct phase locked source and naked packaged chip; 3) working band is wide, and output frequency is 10-20GHz; 4) frequency step is little, and frequency step is 10MHz; 5) power output is high, have employed the amplifier chip of high-gain high saturation output power, can meet the needs of practical application well.
The above embodiment only have expressed embodiments of the present invention, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection range of patent of the present invention should be as the criterion with claims.
Claims (4)
1. the broadband phase locked source of a small size, Low phase noise, it is characterized in that, comprise referenced drive amplifying circuit, phase discriminator, active loop filter, voltage controlled oscillator, attenuator, power splitter, driving amplifier, amplifier, high pass filter and frequency divider, wherein:
Described referenced drive amplifying circuit, phase discriminator, active loop filter, voltage controlled oscillator, attenuator, power splitter, high pass filter are connected successively with frequency divider, and described frequency divider is connected with described phase discriminator.
Described power splitter, the large device of described driving are connected successively with described amplifier.
2. the phase locked source of small size according to claim 1, is characterized in that, described power splitter is two power splitters.
3. the phase locked source of small size according to claim 1, is characterized in that, described frequency divider is four-divider.
4. the phase locked source of small size according to claim 1, is characterized in that, described broadband phase locked source also comprises power control circuit.
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Cited By (3)
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|---|---|---|---|---|
| CN105897298A (en) * | 2016-06-03 | 2016-08-24 | 北京航空航天大学 | Multi-stage modular wireless transceiver experimental platform |
| CN106603073A (en) * | 2016-11-24 | 2017-04-26 | 中国电子科技集团公司第四十研究所 | Integrated single-loop system for achieving low-phase-noise microwave broadband frequency synthesis |
| CN109343606A (en) * | 2018-11-15 | 2019-02-15 | 扬州海科电子科技有限公司 | A kind of separation compensation temperature control device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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