Duty-cicle Controlled Variable Gain Amplifier

Roddy RomeroFernando RangelDaniel Piovani

A variable gain amplifier (VGA) is proposed as part of a sensor interface for portable biomedical applications in which ultra-low-power analog processing is required. The particular characteristic of this VGA is that its gain can be controlled by a clock signal duty-cycle. Auto-zero technique is also employed for reducing the low-frequency noise and offset. The circuit was designed in standard 0.18 ?m CMOS process and has been sent for fabrication. Post-layout simulation results predicts the expected response of the VGA.

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