基本信息:
- 专利标题： 精確且穩定的角度調變射頻信號之直接數位合成
- 专利标题（英）：Direct digital synthesis of precise, stable angle modulated RF signal
- 专利标题（中）：精确且稳定的角度调制射频信号之直接数码合成
- 申请号：TW088102546 申请日：1999-02-22
- 公开(公告)号：TW428372B 公开(公告)日：2001-04-01
- 发明人： 衣爾W.麥庫尼二世 , 溫戴爾桑德
- 申请人： 特洛普蘭公司
- 申请人地址： 美國
- 专利权人： 特洛普蘭公司
- 当前专利权人： 特洛普蘭公司
- 当前专利权人地址： 美國
- 代理人： 陳長文
- 优先权： 美國 09/027.954 19980223
- 主分类号： H04B
- IPC分类号： H04B
The present invention, generally speaking, provides an RF modulator that allows precise, stable phase shifts to be obtained. The modulator uses a PLL structure including an auxiliary feedforward path used to inject a baseband modulation signal into the PLL at a point past a loop filter of the PLL. A phase demodulator recovers phase information from the output signal of the PLL. The recovered phase information is compared to the phase information of the baseband modulation signal. A resulting error signal is used to control injection of the baseband modulation signal into the PLL, to automatically achieve the correct ""dosage"". A precise, adaptive, phase-stable modulator results. The adaptation of the modulator compensates for variability of the VCO and other components of the PLL.