Superspeed 8/9 bimodule prescaler based on GaAa hetero junction bipolar transistor (HBT) device

Abstract

The invention discloses a superspeed 8 / 9 bimodule prescaler based a GaAa hetero junction bipolar transistor (HBT) device, which mainly solves the problems of low working frequency and high phase noise of the prior art. The superspeed 8 / 9 bimodule prescaler based on the GaAa HBT device comprises a 2 / 3 bimodule prescaler, an asynchronous 4 division frequency divider and a mode selection logic circuit. The 2 / 3 bimodule prescaler is formed by two D triggers which are embedded with NADN gates, the 4 division frequency divider is formed by two D triggers which are asynchronously connected with each other, and the mode selection logic circuit is formed by a triple-input NOR gate and a NOT gate. All the transistors in a prescaler path adopt GaAs single hetero junction bipolar transistors the hetero junction materials of which are InGaP / GaAs. The superspeed 8 / 9 bimodule prescaler based on the GaAa HBT device can realize the 8 frequency division or 9 frequency division function, has high working efficiency, low phase noise, quick working speed, excellent high and low temperature characteristics and better irradiation-resistant performance, and can be applied in a frequency synthesizer in a high-frequency section transmit-receive system.

Description

technical field [0001] The invention belongs to the technical field of integrated circuit design and relates to frequency dividers, in particular to an ultra-high-speed 8 / 9 dual-mode pre-divider based on GaAs HBT devices, which can be used in ultra-high-speed frequency synthesizers. technical background [0002] The frequency synthesizer based on the phase-locked loop PLL is an important component of the front-end circuit of the transceiver in the communication system. With the development of communication technology, the wireless communication frequency band continues to increase, even reaching tens of GHz, which requires the design of a corresponding high-speed phase-locked loop. [0003] A phase-locked frequency synthesizer is composed of a phase-frequency detector, a charge pump, a loop filter, a voltage-controlled oscillator, and a programmable frequency divider, such as figure 1 shown. Among them, the programmable frequency divider and the voltage-controlled oscillat...

AI Technical Summary

Problems solved by technology

[0006] 1) It is difficult to deal with the high frequency output of the VCO;

[0007] 2) The phase noise is high, so that the purity of the signal output by the prescaler is not enough;

[0008] 3) Slow working speed, not suitable for high-speed frequency synthesizer;

[0009] 4) Poor high and low temperature characteristics and radiation resistance

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