LMV321-N, LMV321-N-Q1, LMV358-N, LMV358-N-Q1
LMV324-N, LMV324-N-Q1
SNOS012I –AUGUST 2000–REVISED FEBRUARY 2013
www.ti.com
Figure 53. Indirectly Driving A Capacitive Load with DC Accuracy
INPUT BIAS CURRENT CANCELLATION
The LMV321-N/LMV358-N/LMV324-N family has a bipolar input stage. The typical input bias current of LMV321-
N/LMV358-N/LMV324-N is 15 nA with 5V supply. Thus a 100 kΩ input resistor will cause 1.5 mV of error voltage.
By balancing the resistor values at both inverting and non-inverting inputs, the error caused by the amplifier's
input bias current will be reduced. The circuit in Figure 54 shows how to cancel the error caused by input bias
current.
Figure 54. Cancelling the Error Caused by Input Bias Current
TYPICAL SINGLE-SUPPLY APPLICATION CIRCUITS
Difference Amplifier
The difference amplifier allows the subtraction of two voltages or, as a special case, the cancellation of a signal
common to two inputs. It is useful as a computational amplifier, in making a differential to single-ended
conversion or in rejecting a common mode signal.
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