Telecommunications – Transmitter and receiver at same station – Radiotelephone equipment detail
Patent
1996-11-06
2000-05-09
Eisenzopf, Reinhard J.
Telecommunications
Transmitter and receiver at same station
Radiotelephone equipment detail
455 76, 455209, 455315, H04B 138
Patent
active
060615753
ABSTRACT:
In general, the present invention provides a low cost mechanism for reducing the settling time and/or improving the phase noise performance of a frequency synthesizer in a mobile station. In one embodiment, the present invention eliminates the need for using two transmit offset synthesizers in a mobile station which must be able to operate on two different frequency bands characterized by different transmit-receive (TX-RX) channel separation. According to the present invention, one or both of the transmit offset synthesizers may be eliminated by deriving an appropriate transmit offset signal from an auxiliary synthesizer in the mobile station through a relatively simple and inexpensive frequency scaling circuit (e.g., frequency divider or multiplier), and by using a fast settling main channel synthesizer to hop between two different frequencies when the mobile station is switching between transmitting and receiving, respectively.
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Couch, Leon W. Digital and Analog Communication Systems, 1990 pp. 256-257, 1990.
Appiah Charles N.
Eisenzopf Reinhard J.
Ericsson Inc.
Samra Robert A.
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