Maxim Integrated Products, Inc.

Konstantin A Kouznetsov

Mehdi Tavassoli Kilani

Daniel Linebarger

Agustin Lebron

Augustin Lebron

Described herein is a method of automatic gain control and simultaneous digital correction of three types of variations in I/Q receivers: gain imbalance, phase imbalance, and DC offset. Three adaptation loops can operate simultaneously and use the output of an analog to digital converter (ADC) as their input, with the output driving digitally controllable analog components. With appropriate knowledge of signal statistics, the algorithm automatically optimally fills the ADC's full input signal range, providing an automatic gain control function and thus maximizing the signal-to-quantization-noise ratio. In so doing, it corrects gain imbalances between I and Q paths, while additional circuitry corrects DC offsets and phase imbalances.

Methods and apparatus for simultaneous automatic gain, phase and DC offset correction in communication receivers

The present invention is a method and system for a fully programmable modulus pre-scaler. In one embodiment, the pre-scaler is a cascade of fully programmable divide-by-&frac23; sections. A fully programmable divide-by-&frac23; section includes a state machine and a control circuit. The state machine generates a modulus control output synchronously with a clock signal in response to a modulus control input and a programming signal. The state machine has a plurality of states corresponding to a &frac23; divider. The control circuit is coupled to the state machine to generate the programming signal to the state machine in response to a programming word for a frequency divider.

Growing community of inventors

San Diego, CA, United States of America

Konstantin A Kouznetsov