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Op amp zeroing circuit diagram

2015-01-06 16:45  
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Op amp zeroing circuit diagram
Precision op amp without changing the drift of the offset nulling circuit is shown in Figure (a) and (b). Figure (a) is low-drift precision op amp. Figure (b) is the zero offset adder circuit. According to the figure (b), when R4 = RF2, Av2 = 1, thatis the follower. Figure (a), if R1 = R2 = 1kΩ, R3 = RF1 = 1MΩ, then Vol = R3 / (R2 + R3) · (1 + RFl / Rl) · Vi2-RFl/Rl · Vil. Al's voltage gain is obviously great, so its output voltage will contain the A1 offset voltage.