Integrated circuit for a signal processing in the uhf - region of operating radio - transmitter - receiver, in particular, of a cordless telephone

摘要

The designed circuit for time division duplex with frequency hopping technique has a total of only two frequency synthesizers (49, 56) for the transmitter and the receiver paths (48, 62) and only one step-up mixer (54) in the transmitter path. The UHF synthesizer frequency is subjected to frequency division before insertion as superimposed frequency of the allocated mixer in the transmitter and receiver paths enabling its utilization for the UHF frequency synthesizer at different frequencies for the transmitter or receiver slot due to the short settling time. One special field of application of the inventive circuit is wireless telephony.