A high gain and wide output swing Folded Cascode dynamic amplifier for
low power 1bit Quantization based delta sigma ADCs
A high gain and wide output swing dynamic amplifier is proposed for low
power single-loop 1-bit quantization based delta sigma ADCs, which
require wide output swing for integrator for achieving the required
bandwidth and resolution with low power and small area in sensor readout
and audio application. A dynamic folded cascode concept is proposed to
enlarge the output swing of the conventional cascode dynamic amplifier.
Additionally, a novel speed-enhancement technique and a low power common
mode detection circuit are proposed to reduce the power consumption of
the dynamic amplifier. Under 1.8V power supply in 180nm CMOS technology,
the proposed dynamic amplifier achieves 35dB with less than 1dB drop
over an output swing of 2.4V. The proposed dynamic amplifier consumes a
total power of 16μW at an operating frequency of 4MHz.