Monolithic 10-30 MHz tunable bipolar Bessel lowpass filter

A fully differential bipolar monolithic seventh-order Bessel transconductance-capacitor (g/sub m-/C) lowpass filter with a cut-off frequency (f/sub c/) tunable between 10 and 30 MHz is described. The filter has matched normal and differentiated outputs. Programmable equalization up to 15 dB at f/sub c/ is also provided. Total harmonic distortion at 1.5 V/sub pp/ output signal is less than 1%. Nominal power consumption from a single 5-V supply is 200 mW.<
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