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A Wide Gain Range Variable Gain Amplifier with Exponential Gain Control

Min Luo

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Abstract

A wide gain range CMOS variable gain amplifier with exponential gain control is designed using SMIC 0.35μm CMOS mix-signal process.The amplifier has been used in one IRDA IC.The variable gain amplifier consists of Gilbert cell, exponential generator and a stage of a fixed-gain amplifier.After simulation with HSPICE,this amplifier can achieve a continuous-gain control range of-11.3dB～33.4dB,5.2MHz bandwidth(-3dB),60°phase margin and control current make the gain vary linear-in-dB.It has well caught the performance index of whole IRDA IC.

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What this paper is about

A wide gain range CMOS variable gain amplifier with exponential gain control is designed using SMIC 0.35μm CMOS mix-signal process.The amplifier has been used in one IRDA IC.The variable gain amplifier consists of Gilbert cell, exponential generator and a stage of a fixed-gain amplifier.After simulation with HSPICE,this amplifier can achieve a continuous-gain control range of-11.3dB～33.4dB,5.2MHz bandwidth(-3dB),60°phase margin and control current make the gain vary linear-in-dB.It has well caught the performance index of whole IRDA IC.

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Available abstract

A wide gain range CMOS variable gain amplifier with exponential gain control is designed using SMIC 0.35μm CMOS mix-signal process.The amplifier has been used in one IRDA IC.The variable gain amplifier consists of Gilbert cell, exponential generator and a stage of a fixed-gain amplifier.After simulation with HSPICE,this amplifier can achieve a continuous-gain control range of-11.3dB～33.4dB,5.2MHz bandwidth(-3dB),60°phase margin and control current make the gain vary linear-in-dB.It has well caught the performance index of whole IRDA IC.

Key concepts: Phase margin, Variable-gain amplifier, Automatic gain control, Open-loop gain, Fully differential amplifier, Operational amplifier, Computer science, Amplifier

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