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.

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This paper describes the antenna and input stages of a silicon TV-tuner intended for portable devices such as cell phones, laptops and PDAs. The tuner meets the requirements of the mobile and portable DVB-T Radio Access Interface Specifications MBRAI [1]. The first stages of the tuner comprise a broadband antenna, a matching and filtering circuit, and LNA. The frequency band of operation is 470-710MHz (DVB-H). The matching and filtering circuitry comprises a strong GSM trap that attenuates the GSM frequencies by more than 40dB. The overall power gain is 20≤3dB in the band, and the NF of the total chain is less than 4dB. The power consumption is 21mW from 2.5V supply. The LNA is fabricated in a 0.25µm, 35GHz f T BiCMOS technology [2].

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