Transistor bridge rectifier circuit for telephone purposes

Details Transistor bridge rectifier circuit for telephone purposes Transistor bridge rectifier circuit for telephone purposes

H - Electricity

04

M

379/63

H04M 19/00 (2006.01) H02M 7/219 (2006.01) H04M 19/08 (2006.01)

Patent

CA 1186825

ABSTRACT OF THE DISCLOSURE A transistor bridge rectifier circuit which may be monolithically integrated and used to couple to a double- wire telephone line the electronic circuits of a subscri- ber's telephone set connected thereto. This comprises a transistor bridge with a "Graetz bridge" circuit arrangement, a current generator, a pair of current mirror circuits con- nected thereto, which conduct alternately according to the line polarity and a pair of controlled current gain transis- tors, controlled in each case by the output of one of the two current mirror circuits. The transistors on the side opposite the bridge, the bases of which are respectively con- nected to the emitter and to the collector of the same con- trolled current gain transistor, are polarized with the same base current which flows through the controlled current gain transistor.

404813

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