Receiver comprising a digitally controlled capacitor bank

Details Receiver comprising a digitally controlled capacitor bank Receiver comprising a digitally controlled capacitor bank

2007-11-20

2007-11-20

Vuong, Quochien B. (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

C455S333000, C334S015000

Reexamination Certificate

active

10333668

ABSTRACT:
Receiver comprising an RF input filter including a digitally controlled capacitor bank with n capacitors being controlled by a tuning control signal for varying the tuning frequency of the RF input filter within a tuning range. For an improvement of the receiver in price/performance ratio the n capacitors of the digitally controlled capacitor bank are monolythically integrated, whereas the bandwidth of the tunable RF input filter is being adjusted to the maximum relative spread of said capacitors. A continuous tuning control signal is being supplied through an analogue to digital (AD) converter to said capacitor bank and to a first input of a differential stage, an output of the AD converter being coupled through a digital to analogue (DA) converter to a second input of a differential stage, an output of the differential stage being coupled to a control terminal of a variable capacitance diode being arranged in parallel to the digitally controlled capacitor bank.

REFERENCES:
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patent: 6417727 (2002-07-01), Davis
patent: 2001/0002819 (2001-06-01), Ikeda

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