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In this paper we present a 2.7 V fully differential fourth-order bandpass filter developed and realised around four inductors electrically coupled using MOSFETs. Varactors are used for frequency tuning. An amplifier is cascaded at the input for noise and impedance matching. Philips QUBIC4 Si BiCMOS technology is used [1].

In this paper, we present a novel single-ended active integrated bandpass filter employing recursive principles. This circuit is based upon an original method to combine input and delayed feedback signals of a first-order recursive structure thanks to a differential pair combination. The chip surface is 1.12 mm². The filter performs a simulated gain close to 10 dB with a 160 MHz bandwidth. Power consumption is about 32 mW. Noise figure is 4.6 dB at the center frequency. Philips QUBIC4 Si BiCMOS technology is used [1].