Power Electronics / Power Management


MOSFET family targets TV/VCR tuners

28 February 2001 Power Electronics / Power Management

Philips Semiconductors' range of N-channel dual-gate MOSFETs for TV and VCR tuners is designed to cut noise and cross modulation. The BF1201/1202/1203 and 1204 offer significant performance improvements.

The range includes the BF1201 and BF1202 N-channel dual-gate PoLo MOSFETs for VHF and UHF applications with 3-9 supply voltage, such as digital and analog television tuners and professional communications equipment. The BF1201 is optimised for cross-modulation and the BF1202 is optimised for noise.

The products are enhancement type N-channel field-effect transistors with source and substrate interconnected. Both feature high forward transfer admittance to input capacitance ratio partly self-biasing circuits to ensure good cross modulation performance during AGC and good DC stabilisation.

The BF1203 is a combination of two different dual gate MOSFET amplifiers with shared source and gate 2 leads in a single package. The BF1204 is a combination of two equal dual gate MOSFET amplifiers with shared source and gate 2 leads in one package. Both products feature superior cross-modulation performance during AGC and high forward transfer admittance to capacitance ratio. The source and substrates are interconnected and the internal bias circuits enable DC stabilisation as well as the excellent cross-modulation performance. Integrated diodes between the gates and source protect against excessive input voltage surges.



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