DAA hook switch

Telephonic communications – Substation or terminal circuitry – Hold circuit

Reexamination Certificate

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Details

C379S412000

Reexamination Certificate

active

07139391

ABSTRACT:
A hook switch circuit is shown wherein two high-voltage bipolar transistors, a PNP transistor Q1and a NPN transistor Q2. that are connected in a regenerative feedback manner to form a bi-stable latch. The regenerative structure permits the use of low beta transistors that may be turned on with a low control current, but still conduct a sufficient off-hook current. Also shown is a polarity steering regenerative switch (MP1, MP2) that provides a power supply voltage from a telephone line pair and may be adapted for a polarity signal and can be combined with a current mirror (MP7) to produce a current signal proportional to the line voltage (LV1).

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