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Design of a 10GHz bandwidth variable gain amplifier using a GaAs HBT technology

Lei Zhou, Danyu Wu, Jin Wu, Zhi Jin, Xinyu Liu

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Abstract

This paper reports a fully differential variable gain amplifier (VGA) using GaAs heterojunction bipolar transistors (HBTs). Gilbert cells with transimpedance loads are applied to achieve wide bandwidth. According to the single-ended measurements, the 3-dB bandwidth is 10.5GHz at a maximum gain of 22dB. A gain-bandwidth product of 132GHz is achieved. The circuit consists of two cascaded variable gain stages to offer a high dynamic range. The experiment results show the dynamic range is larger than 28dB. The chip consumes 368mV at a supply voltage of −5.2V. Design considerations and experimental results are presented in this paper.

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What this paper is about

This paper reports a fully differential variable gain amplifier (VGA) using GaAs heterojunction bipolar transistors (HBTs). Gilbert cells with transimpedance loads are applied to achieve wide bandwidth. According to the single-ended measurements, the 3-dB bandwidth is 10.5GHz at a maximum gain of 22dB. A gain-bandwidth product of 132GHz is achieved. The circuit consists of two cascaded variable gain stages to offer a high dynamic range. The experiment results show the dynamic range is larger than 28dB. The chip consumes 368mV at a supply voltage of −5.2V. Design considerations and experimental results are presented in this paper.

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OpenAlex reports 2 citations for this work. Citation counts describe recorded attention and do not establish research quality.

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Available abstract

This paper reports a fully differential variable gain amplifier (VGA) using GaAs heterojunction bipolar transistors (HBTs). Gilbert cells with transimpedance loads are applied to achieve wide bandwidth. According to the single-ended measurements, the 3-dB bandwidth is 10.5GHz at a maximum gain of 22dB. A gain-bandwidth product of 132GHz is achieved. The circuit consists of two cascaded variable gain stages to offer a high dynamic range. The experiment results show the dynamic range is larger than 28dB. The chip consumes 368mV at a supply voltage of −5.2V. Design considerations and experimental results are presented in this paper.

Key concepts: Variable-gain amplifier, Transimpedance amplifier, Heterojunction bipolar transistor, Fully differential amplifier, Gain–bandwidth product, Bandwidth (computing), Open-loop gain, Video Graphics Array

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