Trimming circuit and electronic circuit

Details Trimming circuit and electronic circuit Trimming circuit and electronic circuit

2006-04-13

2010-02-16

Lee, Kyung (Department: 2833)

Electrical resistors

Mechanically variable

Resistance value varied by removing or adding material

C338S200000, C338S295000, C257S528000, C257S536000

Reexamination Certificate

active

07663470

ABSTRACT:
A trimming circuit and an electronic circuit that decreases the resistance of an activated transistor while reducing the number of resistors. The trimming circuit includes a plurality of series-connected units. Units for respectively changing adjusting resistances of Runit/2, Runit/4, Runit/8, and Runit/16 are each formed by a transistor, a series-connected resistor circuit, which has resistance Rt and which is connected in series to the transistor, and a parallel-connected resistor circuit, which has resistance Rm and which is connected to the transistor and the series-connected resistor circuit. The resistances Rm and Rt are determined in each unit such that the difference between the resistance Rm when the transistor is off and the resistance of the entire unit when the transistor is on determines the adjusting resistance.

REFERENCES:
patent: 4364006 (1982-12-01), Makabe et al.
patent: 5323137 (1994-06-01), Kimura et al.
patent: 6201288 (2001-03-01), Iwasaki et al.
patent: 6768620 (2004-07-01), Kim et al.
patent: 7053751 (2006-05-01), Itoh
patent: 2003-203231 (2003-07-01), None
patent: 2004-79158 (2004-03-01), None

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