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Frequency generating circuit

A technology for generating circuits and frequencies, applied in the field of communications, can solve problems such as long locking time, and achieve the effect of shortened time, fast locking and output frequency

Pending Publication Date: 2019-08-16
HYTERA COMM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

To obtain a frequency with high precision and low phase noise, the method of phase-locked frequency synthesis is usually used, but the required locking time is longer

Method used

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  • Frequency generating circuit
  • Frequency generating circuit

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Embodiment Construction

[0009] The present invention provides a frequency generating circuit. In order to make the purpose, technical scheme and technical effect of the present invention clearer and clearer, the present invention will be further described in detail below. It should be understood that the specific implementation regulations described here are only used to explain the present invention, and It is not intended to limit the invention.

[0010] The frequency generating circuit in this embodiment includes: a phase detector, a first gating circuit, a second gating circuit, a first resonant circuit, an amplifier, a voltage-controlled oscillator and a feedback circuit.

[0011] Wherein, the signal input end of the phase detector is coupled to the signal source, the signal output end of the phase detector is coupled to the first input end of the first gating circuit, and the second input end of the first gating circuit is connected to the first power supply Coupling, the control end of the fir...

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Abstract

The invention discloses a frequency generation circuit. The frequency generation circuit comprises a phase discriminator, a first gating circuit, a second gating circuit, a first resonance circuit, anamplifier, a voltage-controlled oscillator and a feedback circuit. The first gating circuit and the second gating circuit are used for respectively controlling the second input ends of the first gating circuit and the second gating circuit to be communicated with a fixed end when the second power supply outputs a first level so as to preset the voltage of the voltage-controlled oscillator; and the first gating circuit and the second gating circuit are used for respectively controlling the first input end of the first gating circuit and the first input end of the second gating circuit to be communicated with the fixed end when the second power supply outputs a second level so as to adjust the output frequency of the voltage-controlled oscillator. According to the frequency generation circuit, the frequency locking time is shortened, and the functions of quickly locking and outputting the frequency are realized.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to a frequency generating circuit. Background technique [0002] Frequency generating units are very important in modern communication systems and information processing systems. When it is used as the local oscillator source of the transmitter receiver of the communication system and the clock source of the digital signal processing system, its performance index directly determines the performance index of the system. [0003] At present, with the improvement of data transmission speed, the locking time of the frequency generation unit has increasingly become one of the key indicators of design. The shorter the lock time, the faster the frequency conversion, and the faster the data transmission. To obtain a frequency with high precision and low phase noise, the method of phase-locked frequency synthesis is usually used, but the required locking time is longer. Contents of...

Claims

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Application Information

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IPC IPC(8): H03L7/113
CPCH03L7/113Y02B70/10
Inventor 孙建平覃志华
Owner HYTERA COMM CORP