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Regulated Current Source

IP.com Disclosure Number: IPCOM000090158D
Original Publication Date: 1969-Feb-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 28K

Publishing Venue

IBM

Related People

Moore, RL: AUTHOR [+2]

Abstract

This circuit maintains the current-NIc through variable load RL as the multiple of the output Ic of a small, easily regulated source. The current Ic from the regulated current source 10 flows through one emitter of a multiemitter transistor 12 having N+1 emitters. Current from all the other emitters of transistor 12 flows through RL. Voltage regulator 14 then regulates the base potential Vb of the transistor such that the emitters are all at the same potential, i.e., V1- V2 = 0. This arrangement dissipates less power than employing an equivalent resistor in series with RL to regulate the current and requires less space on monolithic chips than that resistor.

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Regulated Current Source

This circuit maintains the current-NIc through variable load RL as the multiple of the output Ic of a small, easily regulated source. The current Ic from the regulated current source 10 flows through one emitter of a multiemitter transistor 12 having N+1 emitters. Current from all the other emitters of transistor 12 flows through RL. Voltage regulator 14 then regulates the base potential Vb of the transistor such that the emitters are all at the same potential, i.e., V1- V2 =
0. This arrangement dissipates less power than employing an equivalent resistor in series with RL to regulate the current and requires less space on monolithic chips than that resistor.

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