Patent ID: 7482871
Filing Date: 2009-01-27
Classification: H03F,H03H

Abstract:
1. An amplifier comprising: an active load circuit which adds a Zero location and increases a gain by using metal-oxide semiconductor field effect transistors (MOSFETs) feeding back between a first power source and a second power source; a current control circuit which receives a common bias and is connected to the active load circuit; a signal input circuit which receives differential input signals and is connected to the current control circuit; and a current source connected between the second power source and the signal input circuit, wherein the amplifier receives and amplifies the differential input signals, and outputs the amplified differential signals via two contact points between two MOSFETs of the current control circuit and the active load circuit, and wherein the active load circuit comprises: a second current source connected between a common contact point and the first power source; a first active feedback circuit connected between two terminals of the second current source and the second power source; and a second active feedback circuit connected between two terminals of the second current source and the second power source and provided with devices symmetrical to the first active feedback circuit.