Title:
COMMON EMITTER AMPLIFIER OPERATED FROM PLURAL POWER SUPPLIES
Document Type and Number:
Japanese Patent JP3247401
Kind Code:
B2
Abstract:
PURPOSE: To provide a simple and inexpensive circuit operatable from plural supply voltages without consuming a substantial power amount for the ability of being operated from the plural supply voltages.
CONSTITUTION: An emitter 608-1 is connected to a DC power supply terminal 605 and the emitter 608-2 is connected to a battery 603. In the case that the battery is connected and a DC power supply is interrupted, a terminal 606 is at a low voltage, a transistor 613 is turned off and the transistor 612 performs a normal operation. A current is drawn from the higher one of two voltages applied to the emitters 608-1 and 608-2.
Inventors:
Michael E. Wright
Application Number:
JP16847291A
Publication Date:
January 15, 2002
Filing Date:
July 09, 1991
Export Citation:
Assignee:
National Semiconductor Corporation
International Classes:
G05F1/56; G05F3/26; G06F1/26; H03F3/30; H03F3/343; (IPC1-7): G05F1/56; G06F1/26
Domestic Patent References:
| JP5839271A | ||||
| JP5278024U |
Attorney, Agent or Firm:
Kazuo Kobashi (1 person outside)