Patent ID: 6680640
Filing Date: 2004-01-20
Classification: H03G

Abstract:
A programmable gain attenuator, comprising:a signal path having an input, an output, and a set of resistors connected in series between said input and said output; a set of taps, wherein each tap in said set of taps corresponds to a terminal of a resistor in said set of resistors; a set of switches connected to corresponding taps in said set of taps, wherein each switch in said set of switches is connected between a bias voltage and a corresponding tap of said corresponding taps, each switch and said bias voltage located outside said signal path; a passive interpolation resistor having a fixed resistance and connected in parallel with at least two resistors in said set of resistors, between a first selected tap in said set of taps and a second selected tap in said set of taps; wherein a gain of the programmable gain attenuator is determined by controlling said set of switches.