QUALCOMM Incorporated
Oscillating circuit with differential varactor circuits

Abstract:

Aspects of the present disclosure provide an oscillating circuit. An example oscillating circuitry generally includes a differential control pair comprising a first control node and a second control node. The oscillating circuit further includes a first voltage-controlled oscillator (VCO) comprising a first differential varactor circuit having a first positive control input coupled to the first control node and a first negative control input coupled to the second control node. The oscillating circuit also includes a second differential varactor circuit having a second positive control input coupled to the second control node and a second negative control input coupled to the first control node.