| 摘要 |
<p>In a fast-switching frequency synthesizer switching between receiving and transmitting mode frequency is done by changing the divisor of the loop divider and by presteering voltage injection at the voltage controlled oscillator ("VCO") with feedback to allow the VCO, and synthesizer, to quickly transition between two given frequencies. This presteering mechanism, with the feedback, allows the presteering voltage to track the variations in the VCO gain from device to device, and gain changes while in operation. This same information is used to implement a means of automatically adjusting the FM deviation of the transmitter since that information varies with the gain of the VCO as does the FM deviation. <IMAGE></p> |
