Fully Integrated Tuner Architecture
First Claim
1. A cable set top box, comprising:
- an integrated receiver configured to provide received data based upon a received signal, the integrated receiver comprising;
a first mixer, disposed upon the substrate, configured to convert a frequency of the received signal to a first intermediate frequency (IF),a first filter bank, disposed upon the substrate, configured to filter an output of the first mixer, the first filter bank including a plurality of cascaded filters, each of the plurality of cascaded filters having a substantially identical frequency response, anda second mixer, disposed upon the substrate, configured to convert a frequency of an output of the first filter bank from the first IF to a second IF to provide the received data; and
a set top box decoder configured to provide an audio output and a video output based upon the received data.
7 Assignments
0 Petitions
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 programmable attenuation and a programmable 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.
-
Citations
19 Claims
-
1. A cable set top box, comprising:
-
an integrated receiver configured to provide received data based upon a received signal, the integrated receiver comprising; a first mixer, disposed upon the substrate, configured to convert a frequency of the received signal to a first intermediate frequency (IF), a first filter bank, disposed upon the substrate, configured to filter an output of the first mixer, the first filter bank including a plurality of cascaded filters, each of the plurality of cascaded filters having a substantially identical frequency response, and a second mixer, disposed upon the substrate, configured to convert a frequency of an output of the first filter bank from the first IF to a second IF to provide the received data; and a set top box decoder configured to provide an audio output and a video output based upon the received data. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
-
11. A method for processing a received signal, comprising:
-
(a) processing the received signal to provide received data, the processing comprises; (i) converting a frequency of the received signal to a first intermediate frequency (IF); (ii) filtering, by a first filter from among a plurality of cascaded filters, the converted signal from step (i); (iii) filtering, by a second filter from among the plurality of cascaded filters, the filtered signal from step (ii), the first filter and the second filter having a substantially identical frequency response; and (iv) converting a frequency of the filtered signal from step (iii) from the first IF to a second IF to provide the received data; and (b) generating an audio output and a video output based upon the received data. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
-
Specification