Reciever comprising a digitally controlled capacitor bank
First Claim
1. Receiver comprising a tuning circuit including a digitally controlled capacitor bank with n capacitors being monolithically integrated in planary form and being controlled by a tuning control signal, characterised by said n capacitors providing various capacitance values including a unity capacitor covering a unity IC surface, wherein capacitors having capacitance values smaller than said unity capacitor cover respective IC surfaces, which in proportion to their value are smaller than said unity IC surface and wherein capacitors having capacitance values greater than said unity capacitor are being formed by clusters of capacitors, each covering an IC surface corresponding to said unity IC surface.
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Accused Products
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.
23 Citations
34 Claims
- 1. Receiver comprising a tuning circuit including a digitally controlled capacitor bank with n capacitors being monolithically integrated in planary form and being controlled by a tuning control signal, characterised by said n capacitors providing various capacitance values including a unity capacitor covering a unity IC surface, wherein capacitors having capacitance values smaller than said unity capacitor cover respective IC surfaces, which in proportion to their value are smaller than said unity IC surface and wherein capacitors having capacitance values greater than said unity capacitor are being formed by clusters of capacitors, each covering an IC surface corresponding to said unity IC surface.
- 18. Variable capacitance device comprising a digitally controlled capacitor bank with n capacitors being monolithically integrated in planary form and being controlled by a control signal for varying the capacitance of the capacitor bank, characterised by said n capacitors providing various capacitance values including a unity capacitor covering a unity IC surface, wherein capacitors having capacitance values smaller than said unity capacitor cover respective IC surfaces, which in proportion to their value are smaller than said unity IC surface and wherein capacitors having capacitance values greater than said unity capacitor are being formed by clusters of capacitors, each covering an IC surface corresponding to said unity IC surface.
Specification