THICK-FILM RESISTOR TRIMMING DEVICE Russian patent published in 2009 - IPC H01C17/22 

FIELD: electrical engineering.

SUBSTANCE: proposed device comprises first reference voltage source (1), comparator (2), resistance metre (3), differentiator (4), ADC (5), voltage absolute value separation unit (6), comparator (7), second reference voltage source (8), shift register (9), monostable multivibrator (10), elements AND (11-1) to (11-n), DAC (12), flare discharge generator (13), switch (14), working electrodes (15-1) to (15-n), fitting resistor (16) and substrate holder (17). Radiating cone vertex of every electrode is located at fixed distance from surface of resistor (16) that decreases with increasing order number of working electrode (15-1) to (15-n), and adds to increasing accuracy and efficiency of trimming which displays at larger degree in the region of minor resistance increments. Device differentiator (4), voltage absolute value separation unit (6), comparator (7), second reference voltage source (8) and monostable multivibrator (10) allows accounting for trimmed resistor temperature variations and forming time intervals between two cycles of parching (with due allowance for film cooling time, and decreasing with increasing digit number). Trimming is effected on aforesaid basis.

EFFECT: higher accuracy and efficiency of trimming.

1 dwg