Micropower amplifier/transducer driver with signal expansion

Amplifiers – With semiconductor amplifying device – Including push-pull amplifier

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Details

330268, 330270, H03F 330

Patent

active

052297217

ABSTRACT:
An amplifier which combines the low quiescent current requirements of a Class B transistor amplifier with the minimal distortion qualities of a Class AB amplifier. In one disclosed embodiment the amplifier is utilized as a receiver amplifier and as a transmitter in a modular telephone adapter for coupling a telephone headset to a conventional modular telephone comprising a handset and a base unit. Signal expansion circuitry takes advantage of the dynamic emitter resistance of transistors in the amplifier's output stage through modulation of collector current in the output transistors and inverted phase summation of the resulting error signal with the input signal. DC bias circuitry supplies a current supply which is relatively insensitive to changes in power supply or device parameters. In one disclosed embodiment of the invention, two such amplifiers are utilized in a modular telephone headset adapter which allows a telephone headset and a telephone handset to be switchably connected to a telephone base unit.

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