Telephone line monitor amplifier

Details Telephone line monitor amplifier Telephone line monitor amplifier

1985-12-16

1987-06-09

Rubinson, Gene Z.

Telephonic communications

Substation or terminal circuitry

Amplifying

330296, 379387, H04M 160

Patent

active

046726640

ABSTRACT:
A transistorized current amplifier based on a cascode stage feeding into a composite transistorized output stage. The amplifier employs a constant current source, decoupling (isolation) from the power source and a signal limiting network to lower distortion on high signal input conditions. A two-wire device, the amplifier derives signal and power from a telephone line. Surge protection is provided by a signal limiting network and the inclusion of relatively high value resistors in the circuit.

REFERENCES:
patent: 3983502 (1976-09-01), Wheatley, Jr.
patent: 4523057 (1985-06-01), Boeckmann
"An Integrated Telephone Speech Circuit Including a Line Fed Loudspeaker Amplifier", Eberhardt et al., IEEE Journal of Solid-State Circuits, vol. SC-17, No. 3, Jun. 1982, pp. 494-498.

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