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...

AI Technical Summary

Problems solved by technology

Although this frequency division circuit can realize the frequency division of the input signal by two, it has the disadvantages of narrow operating frequency range, low operating frequency, and high chip manufacturing cost.

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