Local Oscillator Driver Circuitry with Second Harmonic Rejection

Abstract

An electronic device may include wireless circuitry having a mixer configured to receive an oscillating signal from oscillator circuitry. The oscillator circuitry can include a chain of buffer circuits referred to as oscillator driver circuitry. Transformers may be coupled at the input and output of each buffer circuit in the chain. Adjustable biasing circuits may be coupled at the input of a selected buffer circuit in the chain. The adjustable biasing circuits can be digital-to-analog converters (DACs) configured to apply a differential direct current (DC) offset voltage to the input of the selected buffer circuit. The differential DC offset voltage can have a value that minimizes a second harmonic component of the oscillator driver circuitry.

Dependencies are inferred from the claim text.