Fully integrated tuner architecture
First Claim
1. An integrated receiver comprising:
- a substrate providing a physical medium upon which a receiver circuit is disposed;
a mixer having its circuit elements disposed upon the substrate for converting a received signal to a first IF;
a first filter bank having its circuit elements disposed upon the substrate for removing an image distortion from the first IF and removing unwanted channels;
a first I/Q mixer disposed upon the substrate for converting the first IF to a second IF and rejecting a first IF image distortion;
a second filter bank having its circuit elements disposed upon the substrate for removing an image distortion and unwanted channels from the second IF; and
a second I/Q mixer disposed upon the substrate for converting the second IF to a third IF and rejecting a second IF image distortion;
whereby frequency conversion, channel selectivity and all image rejection are performed on the integrated circuit.
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Accused Products
Abstract
An integrated receiver with channel selection and image rejection substantially implemented on a single CMOS integrated circuit is described. A receiver front end provides programable attenuation and a programable gain low noise amplifier. Frequency conversion circuitry advantageously uses LC filters integrated onto the substrate in conjunction with image reject mixers to provide sufficient image frequency rejection. Filter tuning and inductor Q compensation over temperature are performed on chip. The filters utilize multi track spiral inductors. The filters are tuned using local oscillators to tune a substitute filter, and frequency scaling during filter component values to those of the filter being tuned. In conjunction with filtering, frequency planning provides additional image rejection. The advantageous choice of local oscillator signal generation methods on chip is by PLL out of band local oscillation and by direct synthesis for in band local oscillator. The VCOs in the PLLs are centered using a control circuit to center the tuning capacitance range. A differential crystal oscillator is advantageously used as a frequency reference. Differential signal transmission is advantageously used throughout the receiver.
223 Citations
59 Claims
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1. An integrated receiver comprising:
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a substrate providing a physical medium upon which a receiver circuit is disposed; a mixer having its circuit elements disposed upon the substrate for converting a received signal to a first IF; a first filter bank having its circuit elements disposed upon the substrate for removing an image distortion from the first IF and removing unwanted channels; a first I/Q mixer disposed upon the substrate for converting the first IF to a second IF and rejecting a first IF image distortion; a second filter bank having its circuit elements disposed upon the substrate for removing an image distortion and unwanted channels from the second IF; and a second I/Q mixer disposed upon the substrate for converting the second IF to a third IF and rejecting a second IF image distortion; whereby frequency conversion, channel selectivity and all image rejection are performed on the integrated circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57)
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58. An integrated receiver comprising:
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a substrate means for disposing a circuit upon; a mixer means for converting a received signal to a first IF, having its circuit elements disposed upon the substrate; a first filter bank means for removing an image distortion from the first IF and removing unwanted channels and having its circuit elements disposed upon the substrate; a first I/Q mixer means for converting the first IF to a second IF and rejecting a first IF image distortion, having its circuit elements disposed upon the substrate; a second filter bank means for removing an image distortion and unwanted channels from the second IF, and having its circuit elements disposed upon the substrate; and a second I/Q mixer means for converting the second IF to a third IF and rejecting a second IF image distortion, having its circuit elements disposed upon the substrate; whereby frequency conversion, channel selectivity and all image rejection are performed on the integrated circuit.
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59. In an integrated circuit communication device, a method for rejecting at least one particular interference signal from an input frequency spectrum, the method comprising:
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providing an input frequency spectrum; shifting the input frequency spectrum by a first selected amount to create a first shifted spectrum, thereby positioning a particular image response of the first spectrum beyond the bandwidth of the receiver; filtering the first shifted spectrum in an integral LC filter to attenuate the particular image of the first shifted spectrum; mixing the first shifted spectrum in an image rejection mixer to create a second shifted spectrum and to attenuate a particular image of the second shifted spectrum; filtering the second shifted spectrum to further attenuate the particular image portion of the second shifted spectrum; mixing the second shifted spectrum in an image rejection mixer to create a third shifted spectrum and to attenuate the particular image of the third shifted spectrum; and filtering the third shifted spectrum to remove out of band distortion.
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Specification