Datasheet

LMV821-N, LMV822-N, LMV822-N-Q1
LMV824-N, LMV824-N-Q1
SNOS032G –AUGUST 1999–REVISED NOVEMBER 2013 www.ti.com
Figure 36. Pulse Response per Figure 35
INPUT BIAS CURRENT CONSIDERATION
Input bias current (I
B
) can develop a somewhat significant offset voltage. This offset is primarily due to I
B
flowing
through the negative feedback resistor, R
F
. For example, if I
B
is 90 nA (max @ room) and R
F
is 100 kΩ, then an
offset of 9 mV will be developed (V
OS
=I
B
x R
F
).Using a compensation resistor (R
C
), as shown in Figure 37,
cancels out this affect. But the input offset current (I
OS
) will still contribute to an offset voltage in the same
manner - typically 0.05 mV at room temp.
Figure 37. Canceling the Voltage Offset Effect of Input Bias Current
APPLICATION CIRCUITS
This section covers the following application circuits:
1. Telephone-Line Transceiver
2. “Simple” Mixer (Amplitude Modulator)
3. Dual Amplifier Active Filters (DAAFs)
• a. Low-Pass Filter (LPF)
• b. High-Pass Filter (HPF)
4. Tri-level Voltage Detector
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