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Design of CMOS Variable Gain Amplifier for High Frequency Tuners

Xianwei Jiang

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Abstract

A CMOS variable gain amplifier(VGA)is designed, which is suitable for the turner of digital video broadcasting-cable(DVB-C). The amplifier is consists of exponential control circuit, amplifier circuit and common mode feedback circuit. The exponential circuit is presented by an approximate exponential function. Simulation results show that the VGA core consumes 4.63mW at 3.3V supply voltage and has a gain range from 0 to 32dB. The frequency range is 46～268MHz and noise figure is less than 10dB.

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What this paper is about

A CMOS variable gain amplifier(VGA)is designed, which is suitable for the turner of digital video broadcasting-cable(DVB-C). The amplifier is consists of exponential control circuit, amplifier circuit and common mode feedback circuit. The exponential circuit is presented by an approximate exponential function. Simulation results show that the VGA core consumes 4.63mW at 3.3V supply voltage and has a gain range from 0 to 32dB. The frequency range is 46～268MHz and noise figure is less than 10dB.

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Available abstract

A CMOS variable gain amplifier(VGA)is designed, which is suitable for the turner of digital video broadcasting-cable(DVB-C). The amplifier is consists of exponential control circuit, amplifier circuit and common mode feedback circuit. The exponential circuit is presented by an approximate exponential function. Simulation results show that the VGA core consumes 4.63mW at 3.3V supply voltage and has a gain range from 0 to 32dB. The frequency range is 46～268MHz and noise figure is less than 10dB.

Key concepts: Variable-gain amplifier, Video Graphics Array, Computer science, Open-loop gain, Fully differential amplifier, Electrical engineering, Operational amplifier, Amplifier

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