Patent ID: 8593320

Claim:
A method of converting an input signal into a voltage output signal, the input signal being a periodic pulse width modulated signal, the input signal being in an active state for a first portion of each of successive time periods and being in an inactive state for a second portion of each time period, the method comprising: supplying a first and second input to an integrator circuit; coupling for a first time period of the pulse width modulated signal a first capacitor between a first output of the integrator circuit and the first input and a second capacitor between a second output of the integrator circuit and the second input; coupling for a successive second time period of the pulse width modulated signal a third capacitor between a first output of the integrator circuit and the first input and a fourth capacitor between a second output of the integrator circuit and the second input; and charging said coupled capacitors during the active state of the first and second time periods and discharging said coupled capacitors during the inactive state of the first and second time periods.