InGaP/GaAs HBT (Heterojunction Bipolar Transistor) super-high-speed frequency-halving circuit based on ECL (Emitter-Coupled Logic)

Abstract

The invention discloses an InGaP/GaAs HBT (Heterojunction Bipolar Transistor) super-high-speed frequency-halving circuit based on ECL (Emitter-Coupled Logic), mainly solving the problems of narrower working frequency range, low frequency and high chip manufacture cost of the traditional frequency dividing circuit. The frequency-halving circuit mainly comprises six difference circuits, four emitter followers and six biasing circuits, wherein a second difference circuit and a third difference circuit are connected to a fifth difference circuit through a first emitter follower and a second emitter follower; the fifth difference circuit and a sixth difference circuit are connected to the second difference circuit through a third emitter follower and a fourth emitter follower to form a trigger with a principal and subordinate structure; and the six difference circuits and the four emitter followers form an ECL circuit. The circuit has the advantages of both the ECL and the InGaP/GaAs HBT and also has strong common-mode interference resistance, stable current gain and high working frequency and is suitable to being used as a medium-scale super-high-speed N-stage cascading 2N frequency divider and a phase locked loop type frequency synthesizer in a radio transceiver.

Description

technical field [0001] The invention belongs to the technical field of integrated circuit design, and in particular relates to an InGaP / GaAs heterojunction bipolar transistor HBT ultra-high-speed two-frequency division circuit based on emitter coupled logic ECL, which can be used for integrated circuit design and signal processing. Background technique [0002] A frequency division circuit is a signal circuit that can process an input high-frequency signal and output a low-frequency signal, and is widely used in communication equipment. Usually, this is implemented using a flip-flop circuit or a latch circuit. The frequency division circuit is an important part of the phase-locked loop, and its working speed directly determines the application range of the phase-locked loop. High-speed communication is an inevitable trend in the development of the information age. Therefore, it is imperative to increase the working speed of the frequency division circuit. [0003] The CMOS...

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Problems solved by technology

Although this frequency division circuit can realize the frequency division of the input signal by two, it ha...

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