Programmable gain attenuator with a wide attenuation range and a fine attenuation step size

摘要

A programmable gain attenuator (PGA) configured to receive a signal at an input and provide an attenuated version of the signal at an output is provided herein. The PGA includes a resistor coupled between a first tap and a second tap, where the first tap is coupled to the input of the PGA. The PGA further includes two sets of switches. The first set of switches is coupled in parallel between the first tap and the output, and the second set of switches is coupled in parallel between the second tap and the output. The attenuation setting of the programmable gain attenuator can be determined by controlling each set of switches.