A single-chip wide-band tuner with an active splitter for cable data modems and set-top boxes is realized in a 0.5µm, 30GHz BiCMOS technology [1]. The IC employs a single down-conversion, low-IF architecture and can receive signals in the 48-860MHz frequency range. Fully integrated selectivity is obtained in combination with a channel decoder. Power consumption is 1.5W with a 3.3V supply.Existing dual-conversion architectures like [2-4], remove the need for tuner alignment, but still use external fixed frequency filters. The goal of this work is to fully integrate the TV front-end selectivity and make external RF and filter components (like coils, SAW and ceramic filters) obsolete, without compromising performance.The IC (Fig. 25.3.1) contains a splitter amplifier, RF AGC amplifier, switchable RF band-pass filter, RF polyphase filter, double quadrature down-conversion mixer, IF polyphase filter, groupdelay correction filter, low-pass filter, IF AGC amplifier, fully integrated voltage controlled oscillator (VCO), synthesizer and a received signal strength indication (RSSI) circuit.
Abstract-In this paper, first results of radio-frequency (RF) circuits processed in a novel silicon bipolar technology called silicon on anything (SOA) are presented. This technology was developed with the application of low-power, high-frequency circuits in mind. Three test IC's are discussed: A fully integrated 3.6-GHz voltage-controlled oscillator, a fully integrated 2.5-GHz diversity receiver front end, and an intermediate-frequency IC containing channel selectivity and demodulation circuits. Measurement results show that using this technology, significant power savings are possible for RF circuits.
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