Silicon Laboratories Inc.
Receiver intermediate variable gain stage for isolator products

Abstract:

A receiver signal path includes a programmable flat gain stage configured to provide an amplified differential pair of signals based on a first frequency response having a selectable flat gain and a differential input pair of signals received on an input differential pair of nodes. The receiver signal path includes a peaking gain stage configured to generate a second amplified differential pair of signals based on the amplified differential pair of signals according to a second frequency response including a first peak gain at or near a carrier frequency in a first pass band. The first peak gain occurs just prior to a first cutoff frequency of the peaking gain stage. The programmable flat gain stage and the peaking gain stage are configured as a variable peaking gain stage. The selectable flat gain is selectively programmed based on a predetermined power consumption of a receiver path.