A biquadratic continuous-time filter designed to operate as signalnshaper in the read-out electronics of elementary particles experimentsnhas been implemented in 2 Μm BiCMOS technology. The cell synthesizesna semi-Gaussian response with a shaping time adjustable in the rangen18-30 ns. The power consumption is 1.25 mW from a single 5 V powernsupply. The integral nonlinearity is within 1% for an input signalnamplitude up to 200 mV. The chip active area is 0.08 mm2. Thenmeasured input referred noise is 50 nV/√Hz
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