Patent ID: 9093971
Filing Date: 2015-07-28
Classification: H03G,H03K,H04L

Abstract:
1. An apparatus, comprising: a detector circuit to receive a time-varying differential communication signal, and including switched capacitors and an inverter to provide an indication of whether a level of the received communication signal is above or below a threshold value, wherein the capacitors comprises a first capacitor coupled to receive the communication signal and a second capacitor coupled to the inverter, the detector circuit further including: a first set of switches, responsive to a first phase of a clock, to enable the first capacitor to store a voltage corresponding to the level of the communication signal and to enable the second capacitor to store a voltage corresponding to a difference between the threshold value and a trip level of the inverter; and a second set of switches, responsive to a second phase of the clock and that is an inverse to the first phase, to couple the first capacitor to the second capacitor to enable a difference between the stored voltages to be provided to the inverter, wherein the first set of switches is closed while the second set of switches is open and vice versa.