An original architecture for the design of low-noise, low offset instrumentation amplifiers is described. The amplifier, based on a modified indirect current feedback structure, exploits chopper modulation to reject input offset voltage and low frequency noise. The key features of the proposed topology are: (i) embedding of the chopper modulation scheme into a 2nd order Gm-C low pass filter to obtain intrinsic chopper ripple rejection; (ii) equalization of the input and feedback common mode voltages for improved gain accuracy; (iii) biasing of the input devices in deep subthreshold region, to improve noise vs. power consumption efficiency. The effectiveness of the approach is illustrated by means of accurate electrical simulations.
A novel compact instrumentation amplifier for optimal interfacing of thermoelectric sensors
Piotto M;
2015
Abstract
An original architecture for the design of low-noise, low offset instrumentation amplifiers is described. The amplifier, based on a modified indirect current feedback structure, exploits chopper modulation to reject input offset voltage and low frequency noise. The key features of the proposed topology are: (i) embedding of the chopper modulation scheme into a 2nd order Gm-C low pass filter to obtain intrinsic chopper ripple rejection; (ii) equalization of the input and feedback common mode voltages for improved gain accuracy; (iii) biasing of the input devices in deep subthreshold region, to improve noise vs. power consumption efficiency. The effectiveness of the approach is illustrated by means of accurate electrical simulations.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
