公开(公告)号：JPH10242882A

公开(公告)日：1998-09-11

申请号：JP5293998

申请日：1998-02-18

Applicant: MOTOROLA INC

Inventor： VLAHOS CONSTANTINE ,  PECKHAM DAVID SUTHERLAND ,  SKUTTA FRANK ROBERT

IPC: H04B1/40 ,  H03D7/12 ,  H03J1/00 ,  H04B1/26 ,  H04B1/44

Abstract: PROBLEM TO BE SOLVED: To operate a communication equipment for a plurality of frequency bands such as GSM 900MHz and DCS 1800MHz or the like by eliminating the need for a mixer for each frequency band. SOLUTION: In a radio telephone set of dual band GSM/DCS 1800, a frequency injected to a local oscillator 228 for both bands is given from synthesizer filters 222, 422 to a mixer 234. Thus, a duplex and matching condition to a mixer input is simplified and a signal loss is minimized. A common output port of a GSM RX/LO synthesizer filter and a DCS RX/LO synthesizer filter is duplexed to the mixer input. Moreover, In the input impedance matching to the mixer 234, impedance matches a reception signal at each band and RF is trapped at an intermediate frequency. In an output matching of the mixer 234, it is designed that the impedance of the IF filter matches and a low impedance is provided to an RF input frequency.

公开(公告)号：GB2322491B

公开(公告)日：2000-03-22

申请号：GB9801264

申请日：1998-01-21

Applicant: MOTOROLA INC

Inventor： VLAHOS CONSTANTINE ,  PECKHAM DAVID SUTHERLAND ,  SKUTTA FRANK ROBERT

IPC: H04B1/40 ,  H03D7/12 ,  H03J1/00 ,  H04B1/26 ,  H04B1/44 ,  H03J5/24

Abstract: A method and apparatus enables a communication device (100) to operate in multiple bands, such as GSM 900 MHz, DCS 1800 MHz, and DCS 1900 MHz bands, by eliminating the need for a mixer for each band. In a dual band GSM/DCS 1800 radiotelephone, for example, the local oscillator (LO) injection frequencies for both GSM and DCS bands are provided to a mixer (234) through the use of combination filters (222, 246). Thus, the duplexing and matching requirements to the mixer input are simplified and the signal losses are minimized. The common output ports of the GSM RX/LO combination filter and DCS RX/LO combination filter are duplexed to the input of the mixer. Also, the input impedance matching of the mixer is designed to match the impedance for the received signals in each band, as well as provide an RF trap at the IF frequency. The match at the output of the mixer is designed to match the impedance of the IF filter and provides a low impedance to RF input frequencies. Finally, a tri-band radiotelephone is also described.

公开(公告)号：DE19806096C2

公开(公告)日：2000-05-11

申请号：DE19806096

申请日：1998-02-14

Applicant: MOTOROLA INC

Inventor： VLAHOS CONSTANTINE ,  PECKHAM DAVID SUTHERLAND ,  SKUTTA FRANK ROBERT

IPC: H04B1/40 ,  H03D7/12 ,  H03J1/00 ,  H04B1/26 ,  H04B1/44 ,  H04L27/00 ,  H04B1/06 ,  H04B1/16 ,  H04B7/005 ,  H04L27/38

Abstract: A method and apparatus enables a communication device (100) to operate in multiple bands, such as GSM 900 MHz, DCS 1800 MHz, and DCS 1900 MHz bands, by eliminating the need for a mixer for each band. In a dual band GSM/DCS 1800 radiotelephone, for example, the local oscillator (LO) injection frequencies for both GSM and DCS bands are provided to a mixer (234) through the use of combination filters (222, 246). Thus, the duplexing and matching requirements to the mixer input are simplified and the signal losses are minimized. The common output ports of the GSM RX/LO combination filter and DCS RX/LO combination filter are duplexed to the input of the mixer. Also, the input impedance matching of the mixer is designed to match the impedance for the received signals in each band, as well as provide an RF trap at the IF frequency. The match at the output of the mixer is designed to match the impedance of the IF filter and provides a low impedance to RF input frequencies. Finally, a tri-band radiotelephone is also described.

公开(公告)号：MX9801327A

公开(公告)日：1998-08-30

申请号：MX9801327

申请日：1998-02-18

Applicant: MOTOROLA INC

Inventor： VLAHOS CONSTANTINE ,  PECKHAM DAVID SUTHERLAND ,  SKUTTA FRANK ROBERT

IPC: H04B1/40 ,  H03D7/12 ,  H03J1/00 ,  H04B1/26 ,  H04B1/44 ,  H04B7/00

Abstract: Un método y aparato permiten que un dispositivo de comunicacion (100) opere en multiples bandas, tal como bandas de GSM de 900 MHz, y DC8 de 1800 MHz, y DCs de 1900 MHz, al eliminar la necesidad de un mezclador para cada banda. En un radioteléfono de GSM/DCS 1800 de doble banda, por ejemplo, las frecuencias de inyeccion del oscilador local (LO) para ambas bandas de GSM y de DCS se proporcionan a un mezclador (234) a través del uso de filtros de combinacion (222, 246). De esta manera, los requerimientos de transmision en duplex y acoplamiento de la entrada del mezclador se simplifican y las pérdidas de señal se minimizan. Los puertos de salida comun del filtro de combinacion de RX/LO de GSM y el filtro de combinacion de RX/LO de DCS se transmiten en duplex a la entrada del mezclador. También, el acoplamiento de impedancia de entrada del mezclador se diseña para acoplar la impedancia para las señales recibidas en cada banda, así como para proporcionar un desvío de RF en la frecuencia de IF. El acoplamiento en la salida del mezclador se diseña para acoplar la impedancia del filtro de IF y proporciona una impedancia baja a las frecuencias de entrada de RF. Finalmente, también se describe un radioteléfono de triple banda.

公开(公告)号：DE19806096A1

公开(公告)日：1998-08-27

申请号：DE19806096

申请日：1998-02-14

Applicant: MOTOROLA INC

Inventor： VLAHOS CONSTANTINE ,  PECKHAM DAVID SUTHERLAND ,  SKUTTA FRANK ROBERT

IPC: H04B1/40 ,  H03D7/12 ,  H03J1/00 ,  H04B1/26 ,  H04B1/44 ,  H04Q7/20 ,  H04Q7/32 ,  H04B7/005 ,  H04B1/18 ,  G08C17/02 ,  G06F15/00

Abstract: A method and apparatus enables a communication device (100) to operate in multiple bands, such as GSM 900 MHz, DCS 1800 MHz, and DCS 1900 MHz bands, by eliminating the need for a mixer for each band. In a dual band GSM/DCS 1800 radiotelephone, for example, the local oscillator (LO) injection frequencies for both GSM and DCS bands are provided to a mixer (234) through the use of combination filters (222, 246). Thus, the duplexing and matching requirements to the mixer input are simplified and the signal losses are minimized. The common output ports of the GSM RX/LO combination filter and DCS RX/LO combination filter are duplexed to the input of the mixer. Also, the input impedance matching of the mixer is designed to match the impedance for the received signals in each band, as well as provide an RF trap at the IF frequency. The match at the output of the mixer is designed to match the impedance of the IF filter and provides a low impedance to RF input frequencies. Finally, a tri-band radiotelephone is also described.

公开(公告)号：GB2322491A

公开(公告)日：1998-08-26

申请号：GB9801264

申请日：1998-01-21

Applicant: MOTOROLA INC

Inventor： VLAHOS CONSTANTINE ,  PECKHAM DAVID SUTHERLAND ,  SKUTTA FRANK ROBERT

IPC: H04B1/40 ,  H03D7/12 ,  H03J1/00 ,  H04B1/26 ,  H04B1/44 ,  H03J5/24

Abstract: A method and apparatus enables a communication device Fig 1 to operate in multiple bands, such as GSM 900 MHz, DCS 1800 MHz, and PCS 1900 MHz bands, by eliminating the need for a mixer for each band. In a dual band GSM/DCS 1800 radiotelephone, for example, the local oscillator (LO) injection frequencies for both GSM and DCS bands are provided to a mixer (234) through the use of combination filters(222, 246). Thus, the duplexing and matching requirements to the mixer input are simplified and the signal losses are minimized. The common output ports of the GSM RX/LO combination filter and DCS RX/LO combination filter are duplexed to the input of the mixer. Also, the input impedance matching of the mixer is designed to match the impedance for the received signals in each band, as well as provide an RF trap at the IF frequency. The match at the output of the mixer is designed to match the impedance of the IF filter and provides a low impedance to RF input frequencies. Finally, a tri-band radiotelephone is also described.