CN201869161U

CN201869161U - High-frequency high-stability phase-locking OCXO

Info

Publication number: CN201869161U
Application number: CN2010206395897U
Authority: CN
Inventors: 饶棣
Original assignee: DONGGUAN JINZHEN ELECTRONICS Co Ltd
Current assignee: DONGGUAN JINZHEN ELECTRONICS Co Ltd
Priority date: 2010-12-03
Filing date: 2010-12-03
Publication date: 2011-06-15
Anticipated expiration: 2020-12-03

Abstract

The utility mode discloses a high-frequency high-stability phase-locking OCXO (oven controlled crystal oscillator), which comprises a heating circuit, a standard frequency output circuit, a phase locking circuit, a singlechip, a low-pass filtering circuit and a VCO (voltage controlled oscillator) frequency output circuit; a phase-locking output terminal of the VCO frequency output circuit and the output terminal of the standard frequency output circuit are connected with the input terminal of the phase locking circuit, the output terminal of the phase locking circuit controls the output frequency of the VCO frequency output circuit by the iad of the low-pass filtering circuit; and the control signal outputting terminal of the singlechip is connected the working state controlling and inputting terminal of the phase locking circuit. In the utility model, the functions of the oscillator are effectively decreased, the volume of the oscillator is reduced and the performance of the oscillator is improved.

Description

The high steady phase-locked constant-temperature crystal oscillator of high frequency

Technical field

The utility model belongs to crystal oscillator (hereinafter to be referred as crystal oscillator) field, particularly the high steady phase-locked constant-temperature crystal oscillator of high frequency.

Background technology

Constant-temperature crystal oscillator (hereinafter to be referred as OCXO) is the highest class crystal oscillator of present frequency accuracy, stability, is widely used in the electronic instruments such as global fixed system, communication, metering, remote measuring and controlling, frequency spectrum and network analyzer as accurate time frequency signal source.Existing high frequency constant-temperature crystal oscillator generally is to adopt low frequency OCXO module to add a frequency-variable module composition, structurally separate, its feature is that power consumption is big, volume is big, and frequency-variable module is affected by environment and the complete machine temperature characteristic drift that causes may cause losing lock.

The utility model content

The utility model purpose is to adopt the technical deficiency of the structure of module split combination in order to overcome existing high frequency constant temperature crystal vibration; Provide the fully integrated high frequency of a kind of circuit high steady phase-locked constant-temperature crystal oscillator, can effectively reduce the power consumption of crystal oscillator, the volume that dwindles has improved performance.

The purpose of this utility model is achieved through the following technical solutions: the high steady phase-locked constant-temperature crystal oscillator of high frequency, and base is characterised in that: comprise heater circuit, mark output circuit, phase lock circuitry, single-chip microcomputer, low-pass filter circuit and VCO frequency output circuit frequently; The phase-locked output of described VCO frequency output circuit is connected with the input of phase lock circuitry with the output of mark frequency output circuit, the output of phase lock circuitry links to each other by the FREQUENCY CONTROL input of low-pass filter circuit with VCO frequency output circuit, and the control signal output ends of single-chip microcomputer links to each other with the operating state control input end of phase lock circuitry.

The oscillating circuit that described mark frequency output circuit is made up of the high-accuracy crystal of low frequency, triode.

The VCO oscillating circuit that described VCO frequency output circuit is made up of high-frequency dielectric resonator, triode.

The utility model compared with prior art has following advantage and beneficial effect:

(1) with the cooperation by single-chip microcomputer and phase lock circuitry of low frequency, low ageing rate, high stability OCXO, the VCO that the high-frequency dielectric resonator is realized carries out frequency lock, realizes the high-frequency output of high stability, low ageing rate;

(2) owing to be that low frequency frequency source and phase-locked VCO are combined, realize common constant temperature, improve the affected by environment and complete machine temperature characteristic drift that causes of former VCO;

(3) can reduce volume, reduce power consumption; And can integral body adjust, improve the complete machine performance.

Description of drawings

Fig. 1 is the circuit structure block diagram of the high steady phase-locked constant-temperature crystal oscillator of high frequency;

Fig. 2 is the circuit diagram of main vibration circuit.

Embodiment

Below in conjunction with embodiment and accompanying drawing the utility model is described in further detail, the execution mode of the present utility model that is situated between is not limited thereto.

Embodiment as shown in Figure 1 and Figure 2, the utility model comprises heater circuit, the mark circuit of output circuit, phase lock circuitry, single-chip microcomputer, low-pass filter circuit and the output of VCO frequency frequently, the output on described VCO frequency transmission of electricity road is connected with the input of phase lock circuitry with the output of mark frequency output circuit, the output of phase lock circuitry links to each other by the FREQUENCY CONTROL input of low-pass filter circuit with VCO frequency output circuit, the output frequency of control VCO frequency output circuit, the operating state of single-chip microcomputer output control signal control lock circuitry phase.The oscillating circuit that mark frequency output circuit is made up of the high-accuracy crystal of low frequency, triode.The high-accuracy crystal of low frequency is located between the base stage and collector electrode of triode.The VCO oscillating circuit that VCO frequency output circuit is made up of high-frequency dielectric resonator, triode, high-frequency dielectric resonator are located between its utmost point and collector electrode of triode.

Mark frequency frequently is by the 8th pin input of phase lock circuitry, the frequency of VCO frequency output circuit output is by the 6th pin input of phase lock circuitry, after single-chip microcomputer programming program, under the control operation of program, by with 11 pin of phase lock circuitry, 12 pin and 13 pin, 3 data lines come the control lock circuitry phase synchronous frequently with mark by the phase place (characteristic of frequency) of VCO frequency, simultaneously this (phase-locked) synchronously is the sawtooth waveforms that fixed frequency is arranged by the 2nd pin CPO(of phase lock circuitry) control voltage-controlled realization of VCO frequency output circuit by low-pass filter circuit, constituted simple phase-locked loop circuit thus.Low-pass filter circuit is formed the low pass filter of one-level by R and C, mainly is to be used for high fdrequency component and the interference signal in the phase discriminator output voltage in the filtering phase lock circuitry, thereby obtains the input control voltage of voltage controlled oscillator (VCO).

The mark frequency circuit mainly provides the frequency stability conventional index of product, and VCO frequency output circuit mainly provides nominal frequency and load characteristic.And phase noise is the comprehensive of all circuit phase noises.

The foregoing description is the utility model preferred implementation; but execution mode of the present utility model is not restricted to the described embodiments; other any do not deviate from change, the modification done under spirit of the present utility model and the principle, substitutes, combination, simplify; all should be the substitute mode of equivalence, be included within the novel protection range of this practical heart.

Claims

1. the high steady phase-locked constant-temperature crystal oscillator of high frequency is characterized in that: comprise heater circuit, mark output circuit, phase lock circuitry, single-chip microcomputer, low-pass filter circuit and VCO frequency output circuit frequently; The phase-locked output of described VCO frequency output circuit is connected with the input of described phase lock circuitry with the output of described mark frequency output circuit, the output of phase lock circuitry links to each other by the FREQUENCY CONTROL input of described low-pass filter circuit with VCO frequency output circuit, and the control signal output ends of described single-chip microcomputer links to each other with the operating state control input end of phase lock circuitry.

2. the phase-locked constant-temperature crystal oscillator of high freuqency accuracy according to claim 1 is characterized by: the oscillating circuit that described mark frequency output circuit is made up of the high-accuracy crystal of low frequency, triode.

3. the high steady phase-locked constant-temperature crystal oscillator of high frequency according to claim 1 system is characterized by: the VCO oscillating circuit that described VCO frequency output circuit is made up of high-frequency dielectric resonator, triode.