Tensorcom, Inc.

Future Wei Technologies, Inc.

Huainan Ma

Zaw Soe

Ricky Lap Kei Cheung

KhongMeng Tham

Local oscillator (LO) leakage and Image are common and undesirable effects in typical transmitters. Typically, fairly complex hardware and algorithms are used to calibrate and reduce these impairments. A single transistor that draws essentially no dc current and occupies a very small area detects the LO leakage and Image signals. The single transistor operating as a square-law device is used to mix the signals at the input and output ports of a power amplifier. The mixed signal generated by the single transistor enables the simultaneous calibration of the LO leakage and Image Rejection.

Method and apparatus to detect lo leakage and image rejection using a single transistor

An apparatus and method are provided for controlling the gain of a common source differential amplifier. The common source differential amplifier includes a pair of a metal-oxide-semiconductor field effect transistors (MOSFETs) each including a gate, a drain, and a source and at least one common source degeneration MOSFET in electrical communication between the sources of the pair of MOSFETs, the at least one common source degeneration MOSFET including a plurality of gate structures. A controller is in electrical communication with the gate structures and is configured to selectively activate one or more of the gate structures for controlling the gain of the common source differential amplifier.

Programmable gain stage based on width ratio of two MOSFETs

Method and apparatus to detect LO leakage and image rejection using a single transistor

LO leakage and Image are common and undesirable effects in typical transmitters. Typically, thirty complex hardware and algorithms are used to calibrate and reduce these two impairments. A single transistor that draws essentially no de current and occupies a very small area, is used to detect the LO leakage and Image Rejection signals. The single transistor operating as a square law device, is used to mix the signals at the input and output ports of the power amplifier (PA). The mixed signal generated by the single transistor enables the simultaneous calibration of the LO leakage and Image Rejection.

Growing community of inventors

Laguna Hills, CA, United States of America

Huainan Ma