发明名称 |
Digital amplitude modulation |
摘要 |
A transmitter using quadrature modulation includes a rectangular to polar converter for converting data symbols into a polar form, where each polar symbol has a magnitude signal and an angle signal. Digital phase modulation circuitry includes an all digital PLL circuit for generating a phase modulated RF carrier signal responsive to the angle signal frequency control word (FCW) and a carrier frequency FCW. A digitally controlled amplifier for amplifying the phase modulated signal is controlled by a digital amplitude control circuitry for controlling the gain of the digitally controlled amplifier responsive to the magnitude signal.
|
申请公布号 |
US2005271161(A1) |
申请公布日期 |
2005.12.08 |
申请号 |
US20040927879 |
申请日期 |
2004.08.27 |
申请人 |
TEXAS INSTRUMENTS INCORPORATED |
发明人 |
STASZEWKI ROBERT B.;REZEQ SAMEH;LEIPOLD DIRK |
分类号 |
H03F1/02;H03F1/06;H03F1/32;H03F3/24;H04K1/02;H04L27/20;H04L27/36;(IPC1-7):H04L27/20 |
主分类号 |
H03F1/02 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|