Telecommunications – Transmitter and receiver at same station – With tuning
Reexamination Certificate
2006-07-11
2006-07-11
Tsang, Fan (Department: 2645)
Telecommunications
Transmitter and receiver at same station
With tuning
C455S087000
Reexamination Certificate
active
07076215
ABSTRACT:
A transceiver having an RF receiver, in particular VHF receiver, with digital signal processing in a digital part. The transceiver having an input part, at least one mixer and an intermediate frequency/baseband processing device, having a local channel oscillator, to which a first phase locked loop with a phase discriminator and an adjustable first frequency converter are assigned, and having a reference oscillator for the phase locked loop and the control clock of the digital signal processing device, in which, in order to acquire the control clock, a digital clock synthesizer is provided to which an output signal of the reference oscillator is supplied, and a control signal is supplied by the digital part in the form of a digital tuning word, the frequency of the reference oscillator being selected such that its order of magnitude is at least equal to the bandwidth of one or more of the reception bands used, and none of its harmonics occur in a reception channel.
REFERENCES:
patent: 5291474 (1994-03-01), Ikonen et al.
patent: 6246867 (2001-06-01), Jakobsson
patent: 6321075 (2001-11-01), Butterfield
patent: 6329847 (2001-12-01), Chabas
patent: 6564039 (2003-05-01), Meador et al.
patent: 6741449 (2004-05-01), Pasternak
patent: 0 535 800 (1993-04-01), None
“Delta-Sigma Modulation in Fractional-N Frequency Synthesis” by Riley et al.; IEEE Journal of Solid-State Circuits, vol. 28, No. 5, May 1993.
Genack Matthew
Morrison & Foerster / LLP
Siemens Aktiengesellschaft
Tsang Fan
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