Title :
A Low-Power Low-Voltage Second-Order High-Pass Butterworth Leapfrog Filter
Author :
Serdijn, Wouter A.
Author_Institution :
Dept. of Electr. Eng., Delft Univ. of Technol., Delft, Netherlands
Abstract :
A low-power bipolar continuous-time low-frequency high-pass second-order Butterworth filter that works in the current domain and operates from a single 1.3-V battery is presented. 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 a standard full-custom IC process. A semi-custom realization is shown. The filter demonstrates operation with battery voltages down to IV with less than 16 μW power consumption and a dynamic range of 50 dB. Its cutoff frequency can be varied exponentially with a control current from 100 Hz - 1 kHz.
Keywords :
Butterworth filters; high-pass filters; integrated circuits; low-power electronics; operational amplifiers; Butterworth leapfrog filter; adjustable integrators; adjustable transconductance amplifier; bipolar continuous-time low-frequency filter; capacitance; frequency 100 Hz to 1 kHz; low-power low-voltage second-order high-pass filter; standard full-custom IC process; voltage 1 V; voltage 1.3 V; Batteries; Capacitance; Circuit noise; Cutoff frequency; Dynamic range; Energy consumption; Inductors; Passive filters; Transconductance; Voltage;
Conference_Titel :
Solid-State Circuits Conference, 1992. ESSCIRC '92. Eighteenth European
Conference_Location :
Copenhagen
Print_ISBN :
87-984232-0-7
DOI :
10.1109/ESSCIRC.1992.5468449
