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Design and evaluation of a high-precision, fully tunable OTA-C bandpass filter implemented in GaAs MESFET technology

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5 Author(s)

A second-order bandpass filter employing the operational transconductance amplifier-capacitor (OTA-C) method and featuring independent tuning of center frequency and Q is described. The filter, which is realized in 0.5-μm GaAs MESFET technology, is intended for use in high-precision, continuous-time (CT) IF bandpass filtering applications requiring both accurate amplitude and group delay responses. The filter center frequency is tunable in the range 12-50 MHz, Q is tunable in the range 4-60, and a transfer function accuracy of the order of 1% is achieved throughout the tuning range. Active area is 1 mm2 and static power consumption is 230 mW

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Solid-State Circuits, IEEE Journal of  (Volume:29 ,  Issue: 7 )