Patent ID: 6437645
Filing Date: 2002-08-20
Classification: H03F,H03K

Abstract:
A method of operating a differential input circuit to provide slew boost currents to an output circuit, comprising:(a) providing a differential current steering circuit including a first transistor having a gate coupled to receive a first input signal, a second transistor having a gate coupled to receive a second input signal, and a tail current source coupled to sources of the first and second transistors, and providing first and second outputs of the differential input circuit coupled to the first and second transistors, respectively; (b) operating a first amplifying circuit of the differential input circuit in response to the first input signal to produce a first current; (c) introducing an amount of current equal to the first current into a current summing conductor coupled to the sources of the first transistor and second transistor and the tail current source; (d) operating a second amplifying circuit of the differential input circuit in response to the second input signal to produce a second current; (e) introducing an amount of current equal to the second current into the current summing conductor, the first and second currents boosting currents flowing through the second and first transistors, respectively; and (f) conducting the currents flowing through the first and second transistors through the first and second output conductors, respectively, to the output circuit.