Abstract
In this paper, a low-power gain control amplifier with a direct current offset cancellation circuit is proposed in order to amplify analog signals. The proposed PGA (Programmable Gain Amplifier) is less sensitive to external influences due to the inclusion of active load on differential amplifiers. The PGA connects a direct current offset cancellation circuit, based on the Miller effect, to a differential amplifier stage to reduce area and compensate for distortion or lack of linearity. This circuit is also designed to be adjustable in eight steps, from 4 dB to 60 dB, using gain controls. The proposed PGA is designed using the TSMC 0.13 μm CMOS process, and was verified by simulation in ADS (Advanced Design System) tool. Compared to conventional research results, the proposed PGA achieved a gain error of less than 0.1 dB and a lower consumption of 0.16 mW.
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