Receiver comprising a digitally controlled capacitor bank
DCFirst Claim
1. Receiver comprisinga tuning circuit that includes a digitally controlled capacitor bank with n capacitors monolithically integrated in planar form and controlled by a tuning control signal,the n capacitors providing various capacitance values, including a unity capacitor covering a unity IC surface,wherein:
- capacitors of the n capacitors having capacitance values smaller than the unity capacitor cover respective IC surfaces, which in proportion to their value are smaller than the unity IC surface, andcapacitors of the n capacitors having capacitance values greater than the unity capacitor are formed by clusters of unity capacitors, each unity capacitor covering an IC surface corresponding to the unity IC surface.
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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.
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Citations
37 Claims
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1. Receiver comprising
a tuning circuit that includes a digitally controlled capacitor bank with n capacitors monolithically integrated in planar form and controlled by a tuning control signal, the n capacitors providing various capacitance values, including a unity capacitor covering a unity IC surface, wherein: -
capacitors of the n capacitors having capacitance values smaller than the unity capacitor cover respective IC surfaces, which in proportion to their value are smaller than the unity IC surface, and capacitors of the n capacitors having capacitance values greater than the unity capacitor are formed by clusters of unity capacitors, each unity capacitor covering an IC surface corresponding to the unity IC surface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. Variable capacitance device comprising
a digitally controlled capacitor bank with n capacitors that is monolithically integrated in planar form and is controlled by a control signal for varying the capacitance of the capacitor bank, wherein the n capacitors provides various capacitance values including a unity capacitor covering a unity IC surface, wherein capacitors of the n capacitors having capacitance values smaller than the unity capacitor cover respective IC surfaces, which in proportion to their value are smaller than the unity IC surface and wherein capacitors of the n capacitors having capacitance values greater than the unity capacitor are formed by clusters of unity capacitors, each unity capacitor covering an IC surface corresponding to the unity IC surface.
Specification