公开(公告)号：EP1057252A4

公开(公告)日：2002-09-11

申请号：EP99909493

申请日：1999-02-23

申请人： TROPIAN INC

发明人： MCCUNE EARL W ,  SANDER WENDELL

IPC分类号： H03C3/00 ,  H03B28/00 ,  H03C3/08 ,  H03C3/09 ,  H04L27/20

CPC分类号： H03C3/0966 ,  H03B28/00 ,  H03C3/08 ,  H03C3/0941 ,  H03C3/095 ,  H03C2200/005 ,  H03C2200/0079

摘要： An RF modulator that allows precise, stable phase shifts to be obtained. The modulator uses a PLL structure including an auxiliary feedforward path including an adaptive gain amplifier (411) used to inject a modulation signal into the PLL at a point past a loop filter (403). A phase demodulator (419) recovers from the output of the PLL phase information which is compared in a comparator (417) to the phase information of the modulation signal. A resulting error signal is used to control the gain of the adaptive gain amplifier (411). The modulator compensates for variability of the VCO (405) and other components of the PLL.

公开(公告)号：EP1058968A4

公开(公告)日：2002-04-17

申请号：EP99908178

申请日：1999-02-23

申请人： TROPIAN INC

发明人： MCCUNE EARL W

IPC分类号： H03D3/00 ,  H03D5/00 ,  H04B1/16 ,  H04B1/22 ,  H04L27/22 ,  H04L27/38

CPC分类号： H04B1/22 ,  H03D5/00 ,  H03D2200/0084 ,  H04B1/16

摘要： The present invention, generally speaking, provides a quadrature-free RF receiver for directly receiving RF signals such as angle modulated signals. Various embodiments of the receiver use a digital phase detector (407) together with well-known RF components: a limiter (405), an envelope detector (403), a slow Automatic Gain Control (AGC) circuit (401), a fast AGC circuit, etc. Demodulation may be non-coherent or coherent. The approach followed is to handle the underlying non-linearities of the demodulation process within the circuitry itself, rather than relegating the non-linearities to a separate signal processing step. No I and Q signals are obtained, and no coordinate conversions are performed, offering the potential for space saving, increased accuracy, and especially power savings. Depending on the nature of the modulation employed, either circuitry relating to amplitude recovery or circuitry relating to phase recovery may be dispensed with. As in quadrature systems, the mixing step must remain the same regardless of the characteristics of the modulation employed.