发明授权
- 专利标题: Transmitter having a phase control loop whose frequency bandwidth is varied in accordance with modulation modes
- 专利标题(中): 发射机具有相位控制环路,其频带根据调制模式而变化
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申请号: US10373031申请日: 2003-02-26
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公开(公告)号: US07085544B2公开(公告)日: 2006-08-01
- 发明人: Ryoichi Takano , Kazuhiko Hikasa , Yasuyuki Kimura , Hiroshi Hagisawa , Patrick Wurm , Robert Astle Henshaw , David Freeborough
- 申请人: Ryoichi Takano , Kazuhiko Hikasa , Yasuyuki Kimura , Hiroshi Hagisawa , Patrick Wurm , Robert Astle Henshaw , David Freeborough
- 申请人地址: JP Tokyo GB Hertfordshire
- 专利权人: Renesas Technology Corp.,TTPCOM Limited
- 当前专利权人: Renesas Technology Corp.,TTPCOM Limited
- 当前专利权人地址: JP Tokyo GB Hertfordshire
- 代理机构: Mattingly, Stanger, Malur & Brundidge, P.C.
- 优先权: GB0212729.8 20020531
- 主分类号: H04B1/02
- IPC分类号: H04B1/02
摘要:
A transmitter adopting a polar loop system including a phase control loop for controlling the phase of a carrier signal outputted from a transmitting oscillator and an amplitude control loop for controlling the amplitude of a transmitting output signal outputted from a power amplification circuit, and designed to be capable of performing transmission using a GMSK modulation mode and transmission using an 8-PSK modulation mode. In the transmitter, the phase control loop is shared as a phase control loop for use in the GMSK modulation mode and a phase control loop for use in the 8-PSK modulation mode. A component similar to any one of components constituting a loop filter is provided in parallel therewith so that the component can be connected or disconnected in accordance with the modulation mode, for example, by use of a switching element.