System and method for generating local oscillator (LO) signals for a quadrature mixer
AssigneeSkyworks Solutions, Inc.
InventorsRajasekhar Pullela, Tirdad Sowlati, Dmitriy Rozenblit
Life of this patent
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Abstract
A system for generating local oscillator (LO) signals for a quadrature mixer includes an oscillator configured to provide a reference frequency signal, at least one frequency divider configured to divide the reference frequency signal into three offset phase signals, a first summing circuit configured to generate two nominal 90 degree offset phase signals from the three offset phase signals, and a second summing circuit configured to generate at least two amplitude-corrected 90 degree offset-phase quadrature signals.
Claims18
A system for generating local oscillator (LO) signals for a quadrature mixer, comprising:
- an oscillator configured to provide a reference frequency signal;
- at least one frequency divider configured to divide the reference frequency signal into three offset phase signals having the same frequency as each other;
- a first summing circuit configured to generate two nominal 90 degree offset phase signals from the three offset phase signals, each of the two nominal 90 degree offset phase signals being generated from a plurality of the three offset phase signals;
- and
- a second summing circuit configured to generate at least two amplitude-corrected 90 degree offset-phase quadrature LO signals from the two nominal 90 degree offset phase signals.
A portable transceiver having a system for generating local oscillator (LO) signals for a quadrature mixer, comprising:
- a transmitter operatively coupled to a receiver;
- an oscillator configured to provide a reference frequency signal;
- at least one frequency divider configured to divide the reference frequency signal into three offset phase signals having the same frequency as each other;
- a first summing circuit configured to generate two nominal 90 degree offset phase signals from the three offset phase signals, each of the two nominal 90 degree offset phase signals being generated from a plurality of the three offset phase signals;
- and
- a second summing circuit configured to generate at least two amplitude-corrected 90 degree offset-phase quadrature LO signals from the two nominal 90 degree offset phase signals.
A method for generating local oscillator (LO) signals for a quadrature mixer, comprising:
- providing a reference frequency signal;
- dividing the reference frequency signal into three offset phase signals;
- generating two nominal 90 degree offset phase signals from the three offset phase signals having the same frequency as each other by generating each of the two nominal 90 degree offset phase signals from a plurality of the three offset phase signals;
- and
- generating at least two amplitude-corrected 90 degree offset-phase quadrature LO signals from the two nominal 90 degree offset phase signals.
Dependencies are inferred from the claim text.