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; and
an I/Q mixer disposed upon the substrate for converting the first IF to a second IF and rejecting a first IF image distortion.
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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.
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Citations
16 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; and an I/Q mixer disposed upon the substrate for converting the first IF to a second IF and rejecting a first IF image distortion. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for processing a RF signal having a plurality of channels, comprising:
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(1) mixing the RF signal with a first differential local oscillator signal to produce a first differential IF signal; (2) filtering the first differential IF signal using a differential filter having a passband that is higher in frequency than the RF signal to produce a second differential IF signal; (3) adjusting the first local oscillator signal so that a selected channel in the plurality of channels is shifted into a passband of the differential filter; (4) generating a second differential local oscillator signal having I and Q components; and (5) mixing the second differential IF signal with a second differential local oscillator signal to produce a second differential IF signal, wherein steps (1)-(5) are performed on a common substrate. - View Dependent Claims (12, 13, 14, 15, 16)
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Specification