Patent ID: 6166579
Filing Date: 2000-12-26
Classification: H03G

Abstract:
An apparatus including a digitally controlled signal magnitude control circuit, comprising:a reference DC signal source circuit configured to provide a reference DC signal;a composite signal source circuit configured to provide a first composite signal with a first AC component and a first DC component which is substantially equal to said reference DC signal; anda signal magnitude control circuit with a programmable signal magnitude transfer function, coupled to said reference DC signal source circuit and said composite signal source circuit, configured to receive a plurality of digital control signals, said reference DC signal and said first composite signal and in accordance therewith provide a second composite signal with a second AC component which corresponds to said first AC component and a second DC component which is substantially equal to said reference DC signal, wherein respective values of said plurality of digital control signals define corresponding values of said programmable signal magnitude transfer function and a ratio of said second AC component and said first AC component is substantially equal to one of said values of said programmable signal magnitude transfer function.