Transformerless amplification circuitry for telecommunication sy

Details Transformerless amplification circuitry for telecommunication sy Transformerless amplification circuitry for telecommunication sy

1975-03-20

1976-10-19

Claffy, Kathleen H.

179 81R, 179170NC, H04M 100

Patent

active

039872548

ABSTRACT:
A two-wire line is connected via a resistive hybrid circuit to a high-impedance output of a transmitter amplifier, carrying outgoing voice signals originating at a microphone, and to a high-impedance input of a receiver amplifier, carrying incoming voice signals destined for an earphone. A biasing network, connected across the line in parallel with the hybrid circuit, includes a pair of cascaded complementary transistors whose collectors are interconnected through a low-ohmic voltage divider supplying operating voltage, balanced with reference to the line voltage, to the transmitter ampllifier and delivering a similarly balanced reference voltage to the receiver amplifier.

REFERENCES:
patent: 3022379 (1962-02-01), Soderbaum et al.
patent: 3027429 (1962-03-01), Eklov
patent: 3030446 (1962-04-01), Briggs
patent: 3033940 (1962-05-01), Cox
patent: 3784755 (1974-01-01), Cambridge et al.
"A New Look At Loudspeaking Telephones, " W. Clarke and J. Gale, Telesis, Fall 1973, pp. 79-81.

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