Christopher D Daniel

US Patent:

56847955, Nov 4, 1997

Filed:

Jan 30, 1996

Appl. No.:

8/594098

Inventors:

Christopher John Daniel - Lake Zurich IL
Thomas J. Kovarik - Grayslake IL
Robert Scott Swenson - Hoffman Estates IL

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H04J 306

US Classification:

370347

Abstract:

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).

US Patent:

56970730, Dec 9, 1997

Filed:

Aug 26, 1994

Appl. No.:

8/297190

Inventors:

Christopher John Daniel - Lake Zurich IL
Kevin Joseph Holoubek - Buffalo Grove IL

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H01Q 1112

US Classification:

455126

Abstract:

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).

US Patent:

55793193, Nov 26, 1996

Filed:

Sep 22, 1994

Appl. No.:

8/310613

Inventors:

Christopher J. Daniel - Lake Zurich IL

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H04J 316

US Classification:

370 953

Abstract:

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.