CN205092848U

CN205092848U - Broadband phase locked source that little volume, hypophase were made an uproar

Info

Publication number: CN205092848U
Application number: CN201520935622.3U
Authority: CN
Inventors: 李希密; 尹红波
Original assignee: Yangzhou Haike Electronic Technology Co Ltd
Current assignee: Yangzhou Haike Electronic Technology Co Ltd
Priority date: 2015-11-21
Filing date: 2015-11-21
Publication date: 2016-03-16
Anticipated expiration: 2025-11-21

Abstract

The utility model relates to a broadband phase locked source that little volume, hypophase were made an uproar, divide ware, driving amplifier, amplifier, high pass filter and frequency divider including referring to drive amplifier circuit, phase discriminator, active loop filter, voltage controlled oscillator, attenuator, merit, wherein: reference drive amplifier circuit, phase discriminator, active loop filter, voltage controlled oscillator, attenuator, merit divide ware, high pass filter and frequency divider to connect gradually, and the frequency divider is connected with the phase discriminator, the merit divides ware, driving amplifier and amplifier to connect gradually. The utility model provides a broadband phase locked source that little volume, hypophase were made an uproar, it is showing the advantage and is: 1 )Output phase noise is low, and the noise basement is low, 2 )It is small, adopted little packaging technology of direct phase locked source and naked encapsulation chip, 3 ) working frequency band, 4 ) frequency stepping is little, 5 ) output is high, has adopted the high saturated output's of high -gain amplifier chip, can satisfy practical application's needs well.

Description

The broadband phase locked source of a kind of small size, Low phase noise

Technical field

The utility model belongs to broadband phase locked source technical field, is 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.

Utility model content

For above-mentioned problems of the prior art, the purpose of this utility model is that providing a kind of avoids occurring the small size of above-mentioned technological deficiency, the broadband phase locked source of Low phase noise.

In order to realize above-mentioned utility model object, the technical solution adopted in the utility model 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 the small size that the utility model provides, 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 utility model;

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 utility model;

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 the purpose of this utility model, technical scheme and advantage clearly understand, below in conjunction with the drawings and specific embodiments, the utility model is described further.Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.

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 utility model 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 utility model, 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 above embodiment only have expressed execution mode of the present utility model, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the utility model the scope of the claims.It should be pointed out that for the person of ordinary skill of the art, without departing from the concept of the premise utility, can also make some distortion and improvement, these all belong to protection range of the present utility model.Therefore, the protection range of the utility model patent should be as the criterion with claims.

Claims

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:

2. the broadband phase locked source of small size according to claim 1, Low phase noise, is characterized in that, described power splitter is two power splitters.

3. the broadband phase locked source of small size according to claim 1, Low phase noise, is characterized in that, described frequency divider is four-divider.

4. the broadband phase locked source of small size according to claim 1, Low phase noise, is characterized in that, described broadband phase locked source also comprises power control circuit.