Patent ID: 8542052
Filing Date: 2013-09-24
Classification: H03H

Abstract:
1. An electrical circuit for emulating a capacitance, comprising; a physical capacitor which is charged by charge flow from an input of the electrical circuit; an amplifier for amplifying the voltage at the input of the electrical circuit such that the physical capacitor is charged with a larger change in voltage than a change in voltage at the input; and a reset system for resetting a state of charge of the physical capacitor without drawing charge from the input of the electrical circuit; an up/down counter that counts up when the voltage at the output of the amplifier reaches a first level compared to the input and counts down when the voltage at the output of the amplifier reaches a second level compared to the input; and a D/A converter that converts the output of the up/down counter to an analogue signal, wherein the analogue signal is applied to an input of the gain element.