Clock management circuit of remote sensing camera
A technology for clock management and remote sensing cameras, which is applied to electromechanical clocks, clocks driven by synchronous motors, and clocks, etc. It can solve the problems of difficult clock management and signal quality degradation, and achieve synchronization, improve circuit performance, and improve system performance. performance effect
Inactive Publication Date: 2015-04-22
BEIJING RES INST OF SPATIAL MECHANICAL & ELECTRICAL TECH
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Problems solved by technology
[0003] The invention aims to solve the technical problems that the signal quality of the clock signal in the remote sensing video circuit decreases during the transmission process and the clock is difficult to manage
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[0017] The clock management circuit for a remote sensing camera of the present invention includes a clock management chip, a passive loop filter, a voltage-controlled crystal oscillator (voltage-controlled crystal oscillator), a clock input interface, a clock output interface, a control interface and a state monitoring interface. The clock input interface inputs the external clock signal to the clock management chip. The clock management chip receives the clock signal output from the voltage-controlled crystal oscillator. The clock management chip compares the phase relationship between the external clock signal and the output clock signal of the voltage-controlled crystal oscillator through the internal phase detector. The current error signal of the clock phase difference is output by the charge pump, the passive loop filter receives the current error signal, filters out the high-frequency noise in the current error signal, and converts it into a voltage error signal, and the ...
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The invention provides a clock management circuit of a remote sensing camera. The clock management circuit comprises a clock management chip, a voltage controlled crystal oscillator and a passive ring filter, wherein the clock management chip receives an external clock signal transmitted by a clock input interface, and outputs a clock signal to a clock output interface; the voltage controlled crystal oscillator outputs a voltage controlled clock signal to the clock management chip; and the passive ring filter a current error signal which is obtained by comparing the external clock signal with the voltage controlled clock signal by the clock management chip, converts the current error signal to a voltage error signal, outputs the voltage error signal to the voltage control end of the voltage controlled crystal oscillator, and adjust the phase of the voltage controlled crystal oscillator. Due to the synchronization function of the clock management circuit, high-speed clock signals transmitted between circuit boards are changed into clock signals of a relatively low frequency, and radiation and interference in the high-speed clock signal transmission process are reduced.
Description
technical field [0001] The invention relates to the field of circuit equipment, in particular to a remote sensing camera clock management circuit. The clock management circuit of the present invention is suitable for technical fields with complex clock networks and high clock quality requirements, such as aviation, aerospace, military products and other products, and is especially suitable for remote sensing cameras in the aerospace field. Background technique [0002] At present, in order to improve the image processing capability and image transmission capability of the remote sensing camera or remote sensing video circuit on the spacecraft, the operating frequency of the system needs to be further increased, which puts forward new requirements for the performance of the clock signal. At present, the clock signal in the circuit is transmitted through the cable or the backplane. During the transmission process, the clock signal is affected by the impedance discontinuity of ...
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IPC IPC(8): G04G7/00
Inventor 程甘霖荣鹏黄竞张磊苏浩航郭宇琨倪建军王鑫赵洋闫静纯林为秀
Owner BEIJING RES INST OF SPATIAL MECHANICAL & ELECTRICAL TECH