CN2919694Y

CN2919694Y - High-stabled quartz-vibrating control device

Info

Publication number: CN2919694Y
Application number: CN 200620078967
Authority: CN
Inventors: 许林生
Original assignee: National Time Service Center of CAS
Current assignee: National Time Service Center of CAS
Priority date: 2006-05-12
Filing date: 2006-05-12
Publication date: 2007-07-04
Anticipated expiration: 2016-05-12

Abstract

The utility model directs to a control device for a high-stability crystal oscillator and consists of a controlled high-stability crystal oscillator, a controller, wherein a circuit output terminal is connected with the high-stability crystal oscillator, a monolithic computer system, wherein the circuit is connected with the controller, and a logic interface control circuit, of which an input terminal is connected with the monolithic computer system and of which an output terminal is connected with the controller. The utility model combines a digital potentiometer and an A/D converter to control the electronic frequency control terminal of the high stability crystal oscillator, thus controlling the precision of the output frequency of the high-stability crystal oscillator. The monolithic computer system realizes the A/D converter control by the logic interface control circuit. The utility model has the advantages of reasonable design, anti-vibration, strong immunity to interference, low energy consumption and flexible operation, thereby is applicable for a variety of equipments, such as a receiver, a high-precision universal calculator, a signal generator, a frequency scale and so on.

Description

The control device of high stability crystal oscillator

Technical field

The utility model belongs to electronic measuring technology field, is specifically related to the control device of high stability crystal oscillator.

Background technology

Many measuring instrument equipment need dispose highly stable crystal oscillator, and for example: various types of timing receivers, high-accuracy general counter, signal generator, frequency marking etc. all need highly stable crystal oscillator to satisfy different requirements.The electronic frequency control end (EFC) of existing control highly stable crystal oscillator has two kinds: a kind of is to adopt the 12 figure places/weighted-voltage D/A converter (D/A) of high resolution and amplify buffer circuit, and its shortcoming is that D/A (D/A) price is expensive, circuit is complicated; Another kind is that the resistance with artificial manual adjustments mechanical potentiometer changes the voltage that is added in electronic frequency control end (EFC), and the accuracy of resultant frequency is higher, and its shortcoming is that manual adjustments inconvenience and error are big.

Summary of the invention

Technical problem to be solved in the utility model is to overcome the shortcoming of above-mentioned control highly stable crystal oscillating electron frequency equipment, and the control device of a kind of reasonable in design, anti-vibration, antijamming capability is strong, energy consumption is low, flexible operation is easy high stability crystal oscillator is provided for highly stable crystal vibration.

Solving the problems of the technologies described above the technical scheme that is adopted is that it comprises: controlled highly stable crystal oscillator; Controller, the output termination highly stable crystal oscillator of this circuit; Microcontroller system; This circuit is connected with controller; The logic interfacing control circuit, the input order sheet computer system of this circuit, output termination controller.

Controller of the present utility model comprises: digital regulation resistance, A/D converter, the output termination A/D converter and the highly stable crystal oscillator of digital regulation resistance, the output order sheet computer system of A/D converter, the output termination digital regulation resistance of microcontroller system and logic interfacing control circuit, the output termination A/D converter of logic interfacing control circuit.

Digital regulation resistance of the present utility model is made of integrated circuit U2, A/D converter is made of integrated circuit U3, the model of integrated circuit U2 is AD8400, the model of integrated circuit U3 is ADC0809,7 pin of integrated circuit U2 connect input 1 pin of integrated circuit U1 and input 5 pin of integrated circuit U3,3～5 pin order sheet computer systems, 8 pin connect the 5V positive source, 1 pin ground connection, the 7 pin order sheet computer systems of integrated circuit U3,2-1～2-8 termination microcontroller system, 12 pin and 23～25 pin connect the 5V positive source, 16 pin ground connection, 6 pin and 9 pin and 22 pin connect the logic interfacing control circuit.

The utility model adopts digital regulation resistance and A/D converter to combine and controls the electronic frequency control end (EFC) of highly stable crystal vibration, controls the accuracy of highly stable crystal vibration output frequency.Microcontroller system is realized control to A/D converter by the logic interfacing control circuit; When the voltage on being added in digital regulation resistance changes the EFC end variation that causes the highly stable crystal vibration, the voltage of A/D converter input also changes, monolithic computer starts beginning A/D conversion by logic interfacing control circuit control, and the change in resistance that the data of gathering are removed the control figure potentiometer through result of calculation.The utlity model has reasonable in design, anti-vibration, advantage such as antijamming capability is strong, energy consumption is low, flexible operation is easy, can on instrument and equipments such as all kinds timing receiver, high-accuracy general counter, signal generator, frequency marking, use.

Description of drawings

Fig. 1 is an electrical principle block diagram of the present utility model.

Fig. 2 is the electronic circuit schematic diagram of an embodiment of the utility model.

Embodiment

Below in conjunction with drawings and Examples the utility model is further described, but the utility model is not limited to these embodiment.

Fig. 1 is an electrical principle block diagram of the present utility model, referring to Fig. 1.In Fig. 1, the utility model is to be connected and composed by digital regulation resistance, highly stable crystal oscillator, A/D converter, microcontroller system, logic interfacing control circuit.Digital regulation resistance and A/D converter connect and compose the controller of highly stable crystal oscillator, the output termination A/D converter and the highly stable crystal oscillator of digital regulation resistance, the output order sheet computer system of A/D converter, the output termination of microcontroller system connects logic interfacing control circuit and digital regulation resistance, the output termination A/D converter of logic interfacing control circuit.

In Fig. 2, the highly stable crystal oscillator of present embodiment is made of integrated circuit U1, and the model of integrated circuit U1 is OCX08663.1 pin of integrated circuit U1 connects digital regulation resistance.

The digital regulation resistance of present embodiment is made of integrated circuit U2, and the model of integrated circuit U2 is AD8400.1 pin and A/D converter, 3～5 pin order sheet computer systems, 8 pin that 7 pin of integrated circuit U2 meet integrated circuit U1 connect 5V positive source, 1 pin ground connection.

The A/D converter of present embodiment is made of integrated circuit U3, and the model of integrated circuit U3 is ADC0809.5 pin of integrated circuit U3 connect 1 pin, 7 pin order sheet computer systems, 2-1～2-8 termination microcontroller system, 12 pin of 7 pin of integrated circuit U2 and integrated circuit U1 and 23～25 pin connect 5V positive source, 16 pin ground connection, 6 pin and 9 pin and 22 pin connect the logic interfacing control circuit.

The microcontroller system of present embodiment is connected and composed by integrated circuit U4, crystal oscillator JT, R1, R2, C1, C2, C3, and integrated circuit U4 is that the monolithic computer model is AT89C51.3 pin of integrated circuit U4 connect 5 pin of integrated circuit U2,4 pin that 4 pin meet integrated circuit U2,3 pin that 5 pin meet integrated circuit U2,7 pin that 1 pin meets integrated circuit U3,2-8～2-1 end, 18 pin and 19 pin that P0.0～P0.7 end meets integrated circuit U3 respectively and connect oscillating circuit that crystal oscillator JT and C1 be connected with C2, a end that 9 pin meet C3 and connect 5V positive source, 17 pin and 16 pin by R2 ground connection, 31 pin by R1 and connect the logic interfacing control circuit, another termination 5V positive source of C3.

The logic interfacing control circuit of present embodiment is connected and composed by integrated circuit U5B and integrated circuit U5C, and the model of integrated circuit U5B and integrated circuit U5C is 74HC02.5 pin of integrated circuit U5B connect 17 pin of integrated circuit U4,8 pin that 6 pin meet integrated circuit U4 and 8 pin of integrated circuit U5C, 9 pin that 4 pin meet integrated circuit U3, and 9 pin of integrated circuit U5C connect 6 pin and 22 pin that 16 pin of integrated circuit U4,10 pin meet integrated circuit U3.

Operation principle of the present utility model is as follows:

Analog input end 5 pin of integrated circuit U3 are connected between input 1 pin of the output of integrated circuit U2 and integrated circuit U1, to detect the change in voltage of input.Monolithic computer control P1.7 end becomes low level, allow integrated circuit U5 open-minded, when/WR end step-down effectively after, the ALE of integrated circuit U3 and START end are high simultaneously, A/D changes beginning, end EOC to be converted end is by the low level that uprises, and the P1.0 of integrated circuit U4 receives the A/D EOC signal that the EOC of integrated circuit U3 sends, and integrated circuit U4 directly reads the data of integrated circuit U3 output by P0.1～P0.7; Integrated circuit U4 is according to the data that collected, and through calculating and result changes the resistance of integrated circuit U2, certain value that its output is reached predesignate makes the also change thereupon of output frequency of integrated circuit U1.Integrated circuit U4 repeats above-mentioned action according to programming, constantly detects the change in voltage of integrated circuit U 1 input 1 pin and by changing the resistance of integrated circuit U2, makes the output frequency of integrated circuit U1 stable.

Claims

1, a kind of control device of high stability crystal oscillator is characterized in that it comprises:

Controlled highly stable crystal oscillator;

Controller, the output termination highly stable crystal oscillator of this circuit;

Microcontroller system; This circuit is connected with controller;

The logic interfacing control circuit, the input order sheet computer system of this circuit, output termination controller.

2, according to the control device of the described high stability crystal oscillator of claim 1, it is characterized in that said controller comprises: digital regulation resistance, A/D converter, the output termination A/D converter and the highly stable crystal oscillator of digital regulation resistance, the output order sheet computer system of A/D converter, the output termination digital regulation resistance of microcontroller system and logic interfacing control circuit, the output termination A/D converter of logic interfacing control circuit.

3, control device according to the described high stability crystal oscillator of claim 2, it is characterized in that: said digital regulation resistance is made of integrated circuit U2, A/D converter is made of integrated circuit U3, the model of integrated circuit U2 is AD8400, the model of integrated circuit U3 is ADC0809,7 pin of integrated circuit U2 connect input 1 pin of integrated circuit U1 and input 5 pin of integrated circuit U3,3～5 pin order sheet computer systems, 8 pin connect the 5V positive source, 1 pin ground connection, the 7 pin order sheet computer systems of integrated circuit U3,2-1～2-8 termination microcontroller system, 12 pin and 23～25 pin connect the 5V positive source, 16 pin ground connection, 6 pin and 9 pin and 22 pin connect the logic interfacing control circuit.