Qualcomm Incorporated

Texas Instruments Corporation

Thomson Licensing

Mehmet Ipek

Lai Kan Leung

Ojas Choksi

Timothy Donald Gathman

Janakiram Ganesh Sankaranarayanan

Jun Tan

Robert Bogdan Staszewski

Siraj Akhtar

Heinrich Schemmann

An amplifying circuit includes a first reconfigurable amplifier configured to selectively operate in a cascode mode or a non-cascode mode, wherein an input of the first reconfigurable amplifier is coupled to a first input of the amplifying circuit, and an output of the first reconfigurable amplifier is coupled to an output of the amplifying circuit. The amplifying circuit also includes a second reconfigurable amplifier configured to selectively operate in the cascode mode or the non-cascode mode, wherein an input of the second reconfigurable amplifier is coupled to a second input of the amplifying circuit, and an output of the second reconfigurable amplifier is coupled to the output of the amplifying circuit.

Reconfigurable amplifier

A reconfigurable amplifier includes a first transistor having a gate coupled to an input of the reconfigurable amplifier, and a source coupled to a ground. The reconfigurable amplifier also includes a gate control circuit, and a second transistor having a gate coupled to the gate control circuit, a source coupled to a drain of the first transistor, and a drain coupled to an output of the reconfigurable amplifier, wherein the gate control circuit is configured to output a bias voltage to the gate of the second transistor in a cascode mode, and output a switch voltage to the gate of the second transistor in a non-cascode mode. The reconfigurable amplifier further includes a load coupled to the output of the reconfigurable amplifier.

A novel and useful apparatus for and method of local oscillator generation employing an exception handling mechanism that permits an oscillator having a limited modulation range to handle the large modulation ranges demanded by modern wideband wireless standards such as 3G WCDMA, etc. A controllable oscillator generates an RF signal having four quadrature phases in accordance with an input command signal. An exception handler compares the frequency command information against a threshold. If it exceeds the threshold a phase jump and a residue frequency command are generated. The residue frequency command is input to an oscillator which is operative to generate an RF signal having four quadrature phases. The phase jump is input to a quadrature switch which functions to select one of the four quadrature phase signals as the output RF signal which is then fed to a digital power amplifier.

Local oscillator incorporating phase command exception handling utilizing a quadrature switch

Growing community of inventors

Dallas, TX, United States of America

Mehmet Ipek