Telephone line circuit

Details Telephone line circuit Telephone line circuit

1980-04-21

1981-12-15

Robinson, Thomas A.

179 16F, H04B 158

Patent

active

043061222

ABSTRACT:
The line circuit comprises at least a driver stage 1 having an amplifier. This amplifier is provided with a feedback circuit for forming a virtual output impedance which functions as a supply resistor so that additional collector space is created for the amplifier output transistor. In addition, the line circuit comprises a controlled supply source 5 connected to the amplifier output transistor for eliminating this additional collector space, which results in a low-dissipation line circuit.

REFERENCES:
patent: 4004109 (1977-01-01), Boxall
patent: 4037065 (1977-07-01), Nahay
patent: 4041252 (1977-08-01), Cowden
patent: 4086447 (1978-04-01), Schindler et al.
patent: 4142075 (1979-02-01), Olschewski
patent: 4203012 (1980-05-01), Boxall

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