Patent ID: 6166595
Filing Date: 2000-12-26
Classification: H03F,H03M

Abstract:
A switched capacitor voltage amplifier having at least one signal input, at least one reference input, an output and a plurality of clock inputs, a high voltage gain operational amplifier having an inverting input, a non-inverting input and an output, a plurality of switched capacitors which in the even clock phase are connected between said operational amplifier's inverting input or the switched capacitor's reference input and the switched capacitors amplifier's signal input, in the odd clock phase, wherein at least one of said switched capacitors is connected between the operational amplifier's inverting input and the operational amplifier's output while the rest of said switched capacitors are connected between the operational amplifier's inverting input and a reference input, wherein control means for selecting if each of the switched capacitors should be connected to the switched capacitor amplifier's signal input, reference input or output, and a pseudo random binary number generator, clocked by the same clock, clocking the switched capacitor amplifier, thereby controlling said control means such that the voltage gain of the switched capacitor amplifier, averaged over several clock cycles is exactly equal to a rational number.