Wu R. Precision Instrumentation Amplifiers and Read-Out IC 2013 torrent

Textbook in PDF format

This book describes the use of power-efficient techniques to mitigate low frequency errors, resulting in interface electronics with high accuracy, low noise, and low drift. Since this book is mainly about techniques for eliminating low frequency errors, it describes the nature of these errors and the associated dynamic offset cancelation techniques used to mitigate them. It then shows how these techniques can be applied to operational amplifiers. Then these techniques are extended to current-feedback instrumentation amplifiers (CFIAs) which are well suited for bridge readout. Since the main disadvantage of CFIAs is their limited gain accuracy, the available techniques to improve this are discussed, such as resistordegeneration, dynamic element matching, etc. The advantages and disadvantages of each of these techniques are analyzed. Later, it presents the architecture design and implementation of a CFIA, in
which a new technique (offset reduction loop) is proposed to suppress the chopper ripple without causing noise folding. An improved version CFIA of the first CFIA is described, which maintains the noise performance of the first design and also achieves high gain accuracy without trimming. This is obtained by dynamic element matching and another proposed new technique (gain error reduction loop). The basic architecture of the first CFIA is then combined with an ADC to build a readout IC. The system-level design of the readout IC together with implementation details and measurement results are presented. The CFIA and the ADC collaborate at system level to achieve an optimum performance. Measurement results show that the realized readout IC achieves state-of-the-art offset and drift performance