Motorola Corporation

Joshua E Dorevitch

Paul H Gailus

William J Turney

William J Martin

Terry K Mansfield

Edward T Clark

Mark Rozental

David H Minasi

Richard B Meador

John Janos Bozeki

Quang C Le

Charles H Matsumoto

A system and method for performing baseband phase shifting in a Cartesian feedback system includes a forward path for receiving an input baseband signal having two components, and performing up-conversion to output a RF signal; a power amplifier for amplifying the RF signal output from the forward path; and a feedback path for down-converting at least a sample of the output from the power amplifier to a feedback baseband signal comprising two components, and providing the feedback baseband signal to the forward path in order to be summed with the input baseband signal at a summing junction and before the loop filter. The forward path includes a baseband phase shifter for adjusting the baseband signal output from the summing junction in order to compensate for any phase shifts induced in the system.

System and method for performing baseband phase shifting in a Cartesian feedback system

A transmitter ( ) includes a fractional N synthesizer, a baseband digital modulation stage coupled to the fractional N synthesizer in a first modulation mode, and a baseband I/Q modulation stage also coupled to the fractional N synthesizer and reusing the fractional N synthesizer in a second modulation mode. A method ( ) of operating a transmitter includes transmitting a first signal from a transmitter using the fractional N synthesizer and the baseband digital modulation stage to modulate the first signal according to a first wireless protocol. The method ( ) also includes transmitting a second signal from the transmitter using the baseband I/Q modulation stage and the fractional N synthesizer to modulate the second signal according to a second wireless protocol.

Transmit modulation circuit and method of operating a transmitter

An integrated sigma-delta radio frequency (RF) receiver subsystem ( ) and method utilizes a multi-mode sigma-delta analog-to-digital converter ( ) for providing a single and multi-bit output. A programmable decimation network ( ) for reducing the frequency of the in-phase and quadrature bit stream and a programmable formatting network ( ) are also used for organizing the in-phase and quadrature components from the decimation network ( ) for subsequent signal processing. The invention offers a highly integrated digital/analog RF receiver back-end which incorporates integrated filtering and a smart gain control that is compatible for use with other receiver systems and offering superior performance characteristics.

Integrated multi-mode bandpass sigma-delta receiver subsystem with interference mitigation and method of using same

An integrated multi-mode bandpass sigma-delta radio frequency receiver subsystem with interference mitigation includes a first intermediate frequency amplifier. At least one mixer for mixing the output of the first amplifier and an oscillator signal. A second IF amplifier for amplifying and filtering the output of the at least one mixer. A multi mode multi bandwidth sigma delta analog digital converter for providing digital output signals with high dynamic range. A digital mixer providing I and Q signals a decimation network providing I and Q signals at reduced programmable data and clock frequencies and a formatting network for arranging the I and Q signals into a predetermined format for use with a digital signal processor.

Integrated multi-mode bandpass sigma-delta receiver subsystem with

Growing community of inventors

Chicago, IL, United States of America

Joshua E Dorevitch