Telephone line amplifier with selective gain

Details Telephone line amplifier with selective gain Telephone line amplifier with selective gain

H - Electricity

04

B

330/102, 379/71

H04B 3/08 (2006.01) H01C 1/034 (2006.01) H04B 3/36 (2006.01)

Patent

CA 1041684

ABSTRACT OF THE DISCLOSURE A power amplifier for use in telephone line signal amplification requirements on voice and data grade circuits includes a balanced input transformer and associated differential line transient protection circuit and line matching network, a balanced differential voltage feedback amplifier circuit with externally interchangeable, balanced, passive, terminated atten- uators in the voltage feedback path for varying the amplification factor of the signal amplifying circuit, a balanced-to-unbalanced common mode re- jection circuit, low and high cut frequency filters, and a balanced output transformer with associated output line matching and circuit protection com- ponents. The interchangeable attenuators are calibrated and marked in terms of overall power amplification resulting from their individual and specific use in the circuit.

247531

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