Bipolar audio signal switch

Details Bipolar audio signal switch Bipolar audio signal switch

2003-11-06

2009-02-03

Chin, Vivian (Department: 2615)

Amplifiers

With semiconductor amplifying device

C330S299000, C330S300000, C330S254000, C330S278000, C381S123000

Reexamination Certificate

active

07486138

ABSTRACT:
An audio signal switch has a plurality of inputs and an output. Each input is arranged to be selectively connected to the output via a respective transmission chain, each transmission chain includes: a first bipolar transistor, of a first type, connected to the input; a second bipolar transistor, of a second type, complementary to said first configuration, connected to the output; and an intermediate bipolar transistor, of the second type, connected between said first and second transistors. The first and second transistors are arranged in an emitter-follower circuit configuration, and the intermediate transistor is arranged to act as a diode to protect the first transistor from a large reverse voltage applied to its base-emitter junction.

REFERENCES:
patent: 4639685 (1987-01-01), Saller et al.
patent: 2004/0150461 (2004-08-01), Desprez-Le Goarant et al.

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