A microcircuit tone generator for push-button dialing

• Published in: 1972 IEEE International Solid-State Circuits Conference. Digest of Technical Papers Vol. XV; pp. 76 - 77
• Main Author: Cowpland, M.
• Format: Conference Proceeding
• Language: English
• Published: IEEE 1972
• Subjects: Capacitors; Circuits; Filters; Impedance; Oscillators; Resistors; Resonant frequency; Schottky diodes; Temperature; Voltage

This paper will describe a microelectronic tone generator whose output level is adjustable and stable to better than 1 dB, with operating line voltage ranging from 4.5 to 35 V dc; minimum supply current is 2 mA. Tantalum thin-film techniques used for filter, amplitude filter and amplifier.