Programmable Instrumentation Amplifier Provides Arbitrary Gain Values

Abstract: Data-acquisition systems often include a programmable amplifier to insure that different-amplitude signals will be digitized to full resolution by the A/D converter. Large signals require little, or no, amplification, while low-level signals require high amplification to reduce the effect of converter noise. Two 4-channel differential multiplexers accomplish this task by selecting different gain levels as required for each of four differential input channels.