Patent ID: 8130821
Filing Date: 2012-03-06
Classification: H01L,H04L

Abstract:
1. An integrated circuit containing a communication channel, wherein the communication channel comprises: a transmit circuit configured to transmit signals using a voltage-mode driver; a capacitive link coupled to the transmit circuit; a receive circuit, wherein the transmit circuit is capacitively coupled to the receive circuit via the capacitive link; a filter to equalize signals communicated between the transmit circuit and the receive circuit, wherein the filter includes a capacitive-summing junction; and one or more taps in the filter, wherein an output voltage of the filter is a weighted average of voltages for taps in the filter, and wherein a weight for each voltage is proportional to a capacitance for the corresponding tap relative to a capacitance for the capacitive link, wherein the filter includes at least one tap with a weight element that has an adjustable weight, wherein adjusting the adjustable weight of the weight element involves adjusting a capacitance of the weight element, wherein a relationship between a control voltage input to the weight element and the capacitance of the weight element is non-linear.