发明申请
- 专利标题： Communication semiconductor integrated circuit, a wireless communication apparatus, and a loop gain calibration method
- 专利标题（中）： 通信半导体集成电路，无线通信装置和环路增益校准方法
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申请号： US11407977申请日： 2006-04-21
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公开(公告)号： US20060189285A1公开(公告)日： 2006-08-24
- 发明人: Ryoichi Takano , Kenji Toyota , Patrick Wurm , Robert Henshaw , David Freeborough
- 申请人： Ryoichi Takano , Kenji Toyota , Patrick Wurm , Robert Henshaw , David Freeborough
- 优先权： GB0212725.6 20020531
- 主分类号： H01Q11/12
- IPC分类号： H01Q11/12 ; H04B1/04
摘要：
A polar-loop wireless communication apparatus includes, on a forward path between an amplitude detector and a power amplifier which constitute an amplitude control loop, a variable gain amplifier and a switch to change characteristics of a loop filter to output a frequency bandwidth of the amplitude control loop to an order less than an order for normal operation. The system is operated with the characteristics set to the lower order to measure outputs from the power amplifier to calibrate the output power of the power transmitter, and the register is operated with the characteristics set to the higher order to measure the open loop gain of the amplitude control. According to results of the calculation, data to correct gain characteristics of the variable gain amplifier with respect to an output control signal is stored in a nonvolatile memory of a baseband circuit.
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