A Low-Voltage Low-Power Current-Mode High-Pass Leapfrog Filter
نویسنده
چکیده
A low-power bipolar continuous-time low-frequency high-pass second-order Butterworth filter is presented that works in the current domain and operates from a single 1.3-V battery. The filter contains two adjustable integrators. These integrators are realized by means of a capacitance and an adjustable transconductance amplifier with an indirect output. The complete filter, including all capacitances needed, can be integrated in an ordinary full-custom IC process. A semicustom realization is shown. The filter demonstrates operation down to 1 V with less ~:han 16 #W power consumption and a dynamic range of 50 dB. Its cutoff frequency can be exponentially tuned with a control current over a range from 100 Hz to 1 kHz. Received November 11, 1991; Revised April 8, 1992.
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