公开(公告)号：GB2263596B

公开(公告)日：1996-01-03

申请号：GB9305017

申请日：1992-06-19

Applicant: MOTOROLA INC

Inventor： WALCZAK THOMAS J ,  GREENE ROBERT I ,  CAHILL STEPHEN V ,  DIEHL JOHN W

IPC: H03G3/20 ,  H03G3/30 ,  H04B7/005 ,  H04L27/20 ,  H04B1/04

Abstract: An apparatus and method generates a shaped transition between the minimum and maximum output power levels of a transmitter (500). When the transmitter is turned on a stepped transition (415) is generated at the beginning (3) of the transition region (409) followed by a shaped transition (417) to the end (6) of the transition region (409). When the transmitter (500) is turned off a shaped transition region (417') is generated at the beginning (162) of the transition region (411) followed by a stepped transition (415') at the end (3) of the transition region (411). The stepped transition (415 or 415') is generated by adjusting a voltage controlled attenuator (545) and the bias of a power amplifier (545) in the transmitter (500). The shaped transition (417 or 417') is generated by processing transmitted information through finite impulse response filters (507 or 509) before or after the time slot permitted for transmitting information.

公开(公告)号：GB2263596A

公开(公告)日：1993-07-28

申请号：GB9305017

申请日：1992-06-19

Applicant: MOTOROLA INC

Inventor： WALCZAK THOMAS J ,  GREENE ROBERT I ,  CAHILL STEPHEN V ,  DIEHL JOHN W

IPC: H03G3/20 ,  H03G3/30 ,  H04B7/005 ,  H04L27/20 ,  H04B1/04

Abstract: An apparatus and method generates a shaped transition between the minimum and maximum output power levels of a transmitter (500). When the transmitter is turned on a stepped transition (415) is generated at the beginning (3)) of the transition region (409) followed by a shaped transition (417) to the end (6) of the transition region (409). When the transmitter (500) is turned off a shaped transition region (417') is generated at the beginning (162) of the transition region (411) followed by a stepped transition (415') at the end (3) of the transition region (411). The stepped transition (415 or 415') is generated by adjusting a voltage controlled attenuator (545) and the bias of a power amplifier (545) in the transmitter (500). The shaped transition (417 or 417') is generated by processing transmitted information through finite impulse response filters (507 or 509) before or after the time slot permitted for transmitting information.

公开(公告)号：MX9204295A

公开(公告)日：1993-01-01

申请号：MX9204295

申请日：1992-07-22

Applicant: MOTOROLA INC

Inventor： WALCZAK THOMAS J ,  GREENE ROBERT I ,  CAHILL STEPHEN V ,  DIEHL JOHN W

IPC: H03G3/20 ,  H04L27/20 ,  H03G3/30 ,  H04B7/005 ,  H02H7/20

Abstract: An apparatus and method generates a shaped transition between the minimum and maximum output power levels of a transmitter (500). When the transmitter is turned on a stepped transition (415) is generated at the beginning (3) of the transition region (409) followed by a shaped transition (417) to the end (6) of the transition region (409). When the transmitter (500) is turned off a shaped transition region (417') is generated at the beginning (162) of the transition region (411) followed by a stepped transition (415') at the end (3) of the transition region (411). The stepped transition (415 or 415') is generated by adjusting a voltage controlled attenuator (545) and the bias of a power amplifier (545) in the transmitter (500). The shaped transition (417 or 417') is generated by processing transmitted information through finite impulse response filters (507 or 509) before or after the time slot permitted for transmitting information.

公开(公告)号：HK1000751A1

公开(公告)日：1998-04-24

申请号：HK97102291

申请日：1997-12-01

Applicant: MOTOROLA INC

Inventor： WALCZAK THOMAS J ,  GREENE ROBERT I

IPC: H03G3/20 ,  H03G3/30 ,  H04B7/005 ,  H04L27/20 ,  H04L ,  H03G ,  H04B

Abstract: An apparatus and method generates a shaped transition between the minimum and maximum output power levels of a transmitter (500). When the transmitter is turned on a stepped transition (415) is generated at the beginning (3) of the transition region (409) followed by a shaped transition (417) to the end (6) of the transition region (409). When the transmitter (500) is turned off a shaped transition region (417') is generated at the beginning (162) of the transition region (411) followed by a stepped transition (415') at the end (3) of the transition region (411). The stepped transition (415 or 415') is generated by adjusting a voltage controlled attenuator (545) and the bias of a power amplifier (545) in the transmitter (500). The shaped transition (417 or 417') is generated by processing transmitted information through finite impulse response filters (507 or 509) before or after the time slot permitted for transmitting information.

公开(公告)号：CA2077899C

公开(公告)日：1996-03-12

申请号：CA2077899

申请日：1992-03-09

Applicant: MOTOROLA INC

Inventor： LEMERSAL DONALD B JR ,  WALCZAK THOMAS J ,  GREENE ROBERT I

IPC: H04L27/20 ,  H03C3/00

Abstract: A modulator circuit for generating a modulated, DQPSK signal. The modulator circuit includes an encoder for receiving a binary bit stream comprised of bit pairs defining differential phase changes. An encoder receives a bit stream of which bit pairs thereof define differential phase changes. The encoder encodes the bit pairs into codewords which are stored and then supplied to an I-accumulator a Q-accumulator, and a memory element The memory element contains pre-multiplied values which are supplied to the I- and the Qaccumulators which add terms of the pre-multiplied values to form Iportions and Q-portions of a DQPSK-modulated signal. The I- and Qportions of a DQPSK-modulated signal. The I- and Q- portions may then be supplied to a quadrature modulator.

公开(公告)号：CA2087845A1

公开(公告)日：1993-01-23

申请号：CA2087845

申请日：1992-06-19

Applicant: MOTOROLA INC

Inventor： WALCZAK THOMAS J ,  GREENE ROBERT I ,  CAHILL STEPHEN V ,  DIEHL JOHN W

IPC: H04L27/20 ,  H03G3/20 ,  H03G3/30 ,  H04B7/005 ,  H04B15/04 ,  H04B1/04

Abstract: An apparatus and method generates a shaped transition between the minimum and maximum output power levels of a transmitter (500). When the transmitter is turned on a stepped transition (415) is generated at the beginning (3) of the transition region (409) followed by a shaped transition (417) to the end (6) of the transition region (409). When the transmitter (500) is turned off a shaped transition region (417') is generated at the beginning (162) of the transition region (411) followed by a stepped transition (415') at the end (3) of the transition region (411). The stepped transition (415 or 415') is generated by adjusting a voltage controlled attenuator (545) and the bias of a power amplifier (545) in the transmitter (500). The shaped transition (417 or 417') is generated by processing transmitted information through finite impulse response filters (507 or 509) before or after the time slot permitted for transmitting information.

公开(公告)号：CA2087845C

公开(公告)日：1997-11-04

申请号：CA2087845

申请日：1992-06-19

Applicant: MOTOROLA INC

Inventor： GREENE ROBERT I ,  CAHILL STEPHEN V ,  WALCZAK THOMAS J ,  DIEHL JOHN W

IPC: H04L27/20 ,  H03G3/20 ,  H03G3/30 ,  H04B7/005 ,  H04B15/04 ,  H04B1/04 ,  H04Q7/32

Abstract: An apparatus and method generates a shaped transition between the minimum and maximum output power levels of a transmitter (500). When the transmitter is turned on a stepped transition (415) is generated at the beginning (3) of the transition region (409) followed by a shaped transition (417) to the end (6) of the transition region (409). When the transmitter (500) is turned off a shaped transition region (417') is generated at the beginning (162) of the transition region (411) followed by a stepped transition (415') at the end (3) of the transition region (411). The stepped transition (415 or 415') is generated by adjusting a voltage controlled attenuator (545) and the bias of a power amplifier (545) in the transmitter (500). The shaped transition (417 or 417') is generated by processing transmitted information through finite impulse response filters (507 or 509) before or after the time slot permitted for transmitting information.

公开(公告)号：GB2260671B

公开(公告)日：1995-05-24

申请号：GB9225110

申请日：1992-03-09

Applicant: MOTOROLA INC

Inventor： LEMERSAL JR DONALD B ,  WALCZAK THOMAS J ,  GREENE ROBERT I

IPC: H04L27/20

Abstract: A modulator circuit for generating a modulated, DQPSK signal. The modulator circuit includes an encoder for receiving a binary bit stream comprised of bit pairs defining differential phase changes. An encoder receives a bit stream of which bit pairs thereof define differential phase changes. The encoder encodes the bit pairs into codewords which are stored and then supplied to an I-accumulator, a Q-accumulator, and a memory element. The memory element contains pre-multiplied values which are supplied to the I- and the Q-accumulators which add terms of the pre-multiplied values to form I-portions and Q-portions of a DQPSK-modulated signal. The I- and Q-portions may then be supplied to a quadrature modulator.

公开(公告)号：GB2260671A

公开(公告)日：1993-04-21

申请号：GB9225110

申请日：1992-03-09

Applicant: MOTOROLA INC

Inventor： LEMERSAL JR DONALD B ,  WALCZAK THOMAS J ,  GREENE ROBERT I

IPC: H04L27/20

Abstract: A modulator circuit (150) for generating a modulated, DQPSK signal. The modulator circuit includes an encoder (162) for receiving a binary bit stream comprised of bit pairs defining differential phase changes. An encoder receives a bit stream of which bit pairs thereof define differential phase changes. The encoder encodes the bit pairs into codewords which are stored and then supplied to an I-accumulator (230), a Q-accumulator (236), and a memory element (242). The memory element contains premultiplied values which are supplied to the I- and the Q-accumulators which add terms of the pre-multiplied values to form I-portions and Q-portions of a DQPSK-modulated signal. The I- and Q-portions may then be supplied to a quadrature modulator.

公开(公告)号：MX9201497A

公开(公告)日：1992-10-01

申请号：MX9201497

申请日：1992-04-01

Applicant: MOTOROLA INC

Inventor： LEMERSAL DONALD B JR ,  WALCZAK THOMAS J ,  GREENE ROBERT I

IPC: H04L27/20 ,  H04L27/04

Abstract: A modulator circuit for generating a modulated, DQPSK signal. The modulator circuit includes an encoder for receiving a binary bit stream comprised of bit pairs defining differential phase changes. An encoder receives a bit stream of which bit pairs thereof define differential phase changes. The encoder encodes the bit pairs into codewords which are stored and then supplied to an I-accumulator, a Q-accumulator, and a memory element. The memory element contains pre-multiplied values which are supplied to the I- and the Q-accumulators which add terms of the pre-multiplied values to form I-portions and Q-portions of a DQPSK-modulated signal. The I- and Q-portions may then be supplied to a quadrature modulator.