Integrated circuit arrangement for a telephone subscriber statio

Details Integrated circuit arrangement for a telephone subscriber statio Integrated circuit arrangement for a telephone subscriber statio

1974-08-08

1976-05-04

Claffy, Kathleen H.

179170NC, H04M 158

Patent

active

039550532

ABSTRACT:
An integrated circuit construction for a telephone subscriber station having a microphone amplifier and a receiving audio amplifier is described. An impedance bridge replaces the conventionally used hybrid transformer. The aforementioned amplifiers are constructed in integrated circuit form as differential amplifiers, which are excited in parallel by separate reference voltages produced from two constant currents generated in a common source.

REFERENCES:
patent: 3440367 (1969-04-01), Holtz
patent: 3462560 (1969-08-01), Holzman
patent: 3529099 (1970-09-01), Ribner
patent: 3530260 (1970-09-01), Gaunt
patent: 3612781 (1971-10-01), DaCosta

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