Patent ID: 6121809
Filing Date: 2000-09-19
Classification: H03F,H03K

Abstract:
A phase splitter circuit for producing balanced opposite phase signals from an input AC signal, comprising:first and second transistors, the source of said first and second transistors being connected to a common first node, wherein said first and second transistor operate as a differential amplifier,the gate of said first transistor receiving an input AC signal;the drain of said first transistor producing a first output AC signal;the drain of said second transistor producing a second output AC signal that is 180.degree. out of phase with said first output AC signal;a source resistor, said source resistor connected in series to said first node and ground; anda feedback circuit connected between the drain of said first transistor and the gate of said second transistor for coupling at least a fraction of an amplitude of said first output AC signal to said gate of said second transistor for tuning said amplitude and a phase between said first and second transistor.