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| OPA4684M Datasheet, PDF (19/32 Pages) Texas Instruments – QUAD LOW-POWER CURRENT-FEEDBACK OPERATIONAL AMPLIFIER | |||
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OPA4684M
QUAD LOWÄPOWER CURRENTÄFEEDBACK
OPERATIONAL AMPLIFIER
SGLS145B â AUGUST 2003 â REVISED FEBRUARY 2004
Figure 48. High Gain, DC-Coupled, Single to Differential Conversion
Figure 49. Low-Power, Differential I/O, 4th-Order Butterworth Active Filter
While this circuit is bipolar, using ±5-V supplies, it can easily be adapted to single-supply operation. This is
typically done by providing a supply midpoint reference at the noninverting inputs then adding DC-blocking caps
at each input and in series with the amplifier gain resistor, RG. This will add two real zeroes in the response,
transforming this circuit into a bandpass. Figure 50 shows the frequency response for the filter of Figure 49.
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