Trimming code setting circuit having high reliability

Details Trimming code setting circuit having high reliability Trimming code setting circuit having high reliability

1991-01-08

1992-04-14

Laroche, Eugene R.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307355, 307491, H03K 301

Patent

active

051051010

ABSTRACT:
A semiconductor integrated circuit has a trimming code setting circuit so configured that a desired trimming code is set dependently upon whether or not a thin film resistor is cut. The trimming code setting circuit comprises first and second ratio circuits each of which includes a P-channel transistor having a source connected to a high voltage line and a drain connected through a thin film resistor to a low voltage line. A gate of the P-channel transistor is biased to allow a predetermined current to flow through the thin film resistor and a source-drain of the transistor and the thin film resistor forms a voltage output node. The voltage output node of each of the first and second ratio circuits is connected to a comparator, which in turn outputs a logical signal determined on the basis of whether or not the voltage on the voltage output node of the first ratio circuit is higher than the voltage on the voltage output node of the second ration circuit. The integrated circuit further includes a current setting circuit having a first MOS transistor and a current mirror circuit having a second MOS transistor, the gate of which is connected to the gate of the first MOS transistor.

REFERENCES:
patent: 4317054 (1982-02-01), Caruso
patent: 4754169 (1988-06-01), Morris
patent: 4757216 (1988-07-01), Tanahashi
patent: 4760287 (1988-07-01), Goto
patent: 4845383 (1989-07-01), Iida

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