Multimode half-duplex frequency modulation transceiver
A transceiver, half-duplex technology, applied in the field of communication, can solve the problems of unfavorable miniaturization, complexity, cost and volume increase, and achieve the effect of improving adaptability
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[0020] A multi-mode half-duplex FM transceiver such as figure 2 shown. In this design scheme, 201 is the main clock, 202 is the direct digital synthesis carrier generation circuit, 203 is the low-pass filter, 204 is the frequency multiplier, and they form a complete carrier generation circuit; adopting this composition scheme is mainly to make The spurs of the carrier generated in the form of direct digital synthesis (DDS) can meet the application requirements, and at the same time, a DDS chip that can keep the carrier phase continuous when switching between different frequencies is used; the frequency multiplier is used, on the one hand, it can reduce the direct digital synthesis ( The frequency range covered by the carrier generated in the form of DDS (to facilitate the control of spurious levels), on the other hand, is to reduce the number of up / down conversion stages and improve the suppression of unused sideband components in the up / down conversion process; For example,...
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