Patent ID: 6825724
Filing Date: 2004-11-30
Classification: H03F

Abstract:
An amplifier comprising:a differential pair including a pair of input ports and a pair of output ports; and a nonlinear load coupled to the differential pair, wherein the pair of output ports is coupled to the pair of input ports to provide negative feedback and cross-coupled to the non-linear load to provide positive feedback, wherein the differential pair comprises a first insulated gate field-effect transistor coupled to a current source and a second insulated gate field-effect transistor coupled to the current source, the first insulated gate field-effect transistor and the second insulated gate field-effect transistor each include a first conductivity type, and the nonlinear load includes a pair of insulated gate field-effect transistors each of which includes a second conductivity type, each of the pair of output ports is coupled to one of the pair of input ports through a resistor, the first conductivity type is n-type and the second conductivity type is p-type, and the resistor comprises a variable resistor.