Latch, two-frequency divider circuit based on current mode logic and frequency divider

Abstract

The invention discloses a latch, a two-frequency divider circuit based on current mode logic and a frequency divider. The latch comprises a first logic unit, a second logic unit and a control unit, wherein the first logic unit comprises a first input end, a second input end, a first output end, a second output end and a clock signal positive input end; the second logic unit comprises a third inputend, a fourth input end, a third output end, a fourth output end and a clock signal negative input end; the first output end is coupled with the third input end and the fourth output end; the secondoutput end is coupled with the third output end and the fourth input end; and the control unit is coupled between the first logic unit and a power supply and between the second logic unit and the power supply, and a current path between the power supply and a ground wire is controlled by resistance regulation. The invention provides a latch with a controllable resistance value at the output end; and the frequency divider realized based on the latch can eliminate the problem of narrow frequency division ranges of existing frequency dividers, and can greatly improve the frequency division rangeof the frequency divider.

Description

technical field [0001] The invention relates to the technical field of radio frequency and millimeter wave integrated circuit design, in particular to a latch, a two-frequency divider circuit based on current mode logic, and a frequency divider. Background technique [0002] As the frequency of circuit design continues to increase, millimeter wave circuit design has become a new direction for circuit engineers to compete. The millimeter wave frequency range is 26.5-300GHz, and the bandwidth is as high as 273.5GHz. More than 10 times the full bandwidth from DC to microwave. Even considering atmospheric absorption, only four main windows can be used when propagating in the atmosphere, but the total bandwidth of these four windows can reach 135GHz, which is 5 times the sum of the bandwidths of the microwave bands below. This is undoubtedly very attractive in today's tight frequency resources. Compared with lasers, the propagation of millimeter waves is much less affected by ...

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Problems solved by technology

[0004] In the process of realizing the present invention, the inventor finds that the resistance value in the existing latch circuit is fixed, and at least the following defects exist when the current mode logic two frequency divider circuit composed of the existing latch is used for frequency division: although the existing The frequency division range of the current mode logic two frequency divider circuit is relatively wide, but it still cannot meet the requirements of wideband frequency division, and must cover all process corners, so the existing technology has been difficult to meet the frequency division of the current millimeter wave circuit design need

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