Motorola Corporation

Christopher John Daniel

Thomas J Kovarik

Kevin Joseph Holoubek

Robert Scott Swenson

A transmitter architecture is disclosed which offers a new combination of signal shaping and power control which optimizes transmitter noise figure performance. The disclosed apparatus and method is implemented by separating the shaping element (303) from the power control elements (406, 412, 418) in frequency. Placing the shaping element (303) at a fixed intermediate frequency (IF) allows for the use of readily available, temperature stable shaping elements while distributing the power control elements (406, 412, 418) at radio frequency (RF) facilitates optimization of noise figure performance in the transmitter (200).

Apparatus and method for shaping and power controlling a signal in a

In a Time Division Multiple Access System, multiple offset values are provided to a divider control circuit (213) of a fractional-N synthesizer (200) by utilizing a microprocessor (305). The microprocessor (305) utilizes timeslot information provided to it by a timeslot selector (301), frequency information provided to it by a frequency selector (303) and a read-only memory (307), to provide offset values to the divider control circuit (213).

Method and apparatus for controlling a fractional-N synthesizer in a

A TDMA receiver (100) has a limiting receiver path (116) for access bursts and a linear receiver path (117) for all other traffic and signalling bursts. Since the access bursts are not interleaved in typical TDMA digital cellular systems, such as the Global System for Mobile Communications (GSM) digital cellular system, the loss of amplitude information is not detrimental to acceptable access burst error rates in the TDMA receiver (100) implementation. The TDMA receiver (100) determines the burst-type (either through a priori knowledge of the burst-type or dynamic determination of the burst-type) and a selector switch (124) chooses which receiver path (116, 117) is to be demodulated.

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Lake Zurich, IL, United States of America

Christopher John Daniel