On-chip gain reconfigurable 1.2V 24μW chopping instrumentation amplifier with automatic resistor matching in 0.13μm CMOS

Motivated by low-voltage, low-power and small-size requirements of biomedical and energy scavenging circuits, this work introduces a fully integrated instrumentation amplifier (IA) running at 1.2V with a power consumption of only 24μW. A direct current feedback structure (DCFB) with rail-to-rail output swing is proposed along with a precision reference generation for on-chip resistor trimming. Thus, gain reconfiguration is achieved while guaranteeing low gain error over mismatch, process and temperature variations.