Patent ID: 6278392
Filing Date: 2001-08-21
Classification: G01R,H03M

Abstract:
A system for having an adjustable gain, G, comprising:a sigma-delta modulator for producing a stream of digital words having logic values, M or N, M representing a first binary logic state of a bit within the stream of digital words and N representing a second binary logic state of a bit within the stream of digital words, such stream of digital words being representative of an input analog signal, X(t), fed to said sigma-delta modulator;a gain adjustor, fed by said sigma-delta modulator and a gain signal representative of the variable gain, for converting the stream of digital words produced by said sigma delta modulator into an output stream of digital words having values P or Q, where P=M-(G-1)/2 and Q=N+(G-1)/2, such output stream of digital words representing an output analog signal Z(t)=GX(t).