High speed D trigger based on transistor

Abstract

The invention discloses a high speed D trigger based on a transistor, and mainly solves the problems that an existing D trigger is high in phase noise and low in working frequency. The high speed D trigger based on the transistor mainly comprises a first latch (1), a second latch (2), a preset circuit (3), a first current source circuit (4a) and a second current source circuit (4b). The preset circuit (3) composed of a difference channel is connected with an output end of the second latch (2) and a current input end of the second latch (2). The preset circuit (3) is controlled by external signals to achieve a preset function. The first current source circuit (4a) is connected with a current input end of the first latch (1), and provides stable current for the first latch (1). The second current source circuit (4b) is connected with the current input end of the second latch (2), and provides stable current for the second latch (2). The high speed D trigger based on the transistor has the advantages of being simple in circuit, low in phase noise, high in working frequency, and the like. Accordingly, the high speed D trigger based on the transistor can be applied to a high speed program divider.

Description

technical field [0001] The invention belongs to the technical field of integrated circuit design and relates to a flip-flop, in particular to a high-speed D flip-flop based on a transistor HBT device, which can be used in a program frequency divider. technical background [0002] The program frequency divider is an important part of the phase-locked frequency synthesizer. Many important characteristics of the frequency synthesizer are related to the performance of the program frequency divider. For example, the working speed of the program frequency divider limits the output signal of the frequency synthesizer. the highest frequency, its phase noise affects the in-band phase noise of the frequency synthesizer. Therefore, it is extremely important for a high-performance frequency synthesizer to increase the speed of the program frequency divider and reduce the phase noise of the program frequency divider. [0003] The fundamental difference between the program frequency divi...

AI Technical Summary

Problems solved by technology

[0006] 1) Slow working speed, not suitable for high-speed program frequency divider;

[0007] 2) The phase noise is high, which makes the phase noise of the whole program frequency divider high;

[0008] 3) Low operating frequency, not suitable for high-frequency program frequency divider

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