QUADRATURE LC VCO WITH PASSIVE COUPLING AND PHASE COMBINING NETWORK

摘要

A circuit and method for generating a signal is disclosed. The circuit includes a set of wide tuning LC tanks, a set of core transistors cross coupled to the set of wide tuning LC tanks, and a combining network coupled to the set of wide tuning LC tanks and the set of core transistors. The combining network further includes a set of inputs connected to the set of wide tuning LC tanks and the set of core transistors, a set of coupling transistors connected to the set of inputs, a set of source inductors connected to the set of coupling transistors, a coupling capacitor connected to the set of source inductors, a load resistor connected to the coupling capacitor. The combining network combines the set of inputs and the signal is delivered to the load resistor as a fourth order harmonic.

主权项

1. A circuit for generating a wide-tuning signal comprising:
a set of wide tuning LC tanks; a set of core transistors cross coupled to the set of wide tuning LC tanks; a combining network, coupled to the set of wide tuning LC tanks and the set of core transistors, further comprising:
a set of inputs connected to the set of wide tuning LC tanks and the set of core transistors;a set of coupling transistors connected to the set of inputs;a set of source inductors connected to the set of coupling transistors;a coupling capacitor connected to the set of source inductors;a load resistor connected to the coupling capacitor; whereby the combining network generates a set of quadrature signals from the set of inputs, combines the set of the quadrature signals into the wide-tuning signal, and the wide-tuning signal is delivered to the load resistor as a fourth order harmonic.