发明名称 |
Method and apparatus for calibrating modulation sensitivity |
摘要 |
A method and apparatus for continuously calibrating the modulation sensitivity of a voltage controlled oscillator (VCO) within a modulator of a transmitter. In accordance with the present invention, the transmitter is coupled to the receiver in order to loop back the transmit signal. The present invention includes a baseband signal generator which generates a reference baseband signal of known amplitude during periods when no other baseband information is being applied to the transmitter by the user. A Signal and Reference Comparison Circuit (SRCC) receives the output from the demodulator and determines whether the VCO within the transmitter has the proper modulation sensitivity. If the modulation sensitivity of the VCO is not within a desired range, then a signal generated by the SRCC is applied to a baseband level control circuit to adjust the level of the baseband signal that is applied to the VCO.
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申请公布号 |
US6034573(A) |
申请公布日期 |
2000.03.07 |
申请号 |
US19970961400 |
申请日期 |
1997.10.30 |
申请人 |
UNIDEN SAN DIEGO RESEARCH & DEVELOPMENT CENTER, INC. |
发明人 |
ALDERTON, MARTIN |
分类号 |
H03D7/16;(IPC1-7):H03C3/08 |
主分类号 |
H03D7/16 |
代理机构 |
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地址 |
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