High-Capacitance Line Driver
Capacitive loads invite amplifier instability by reducing phase margin. Instability can be prevented by isolating the load capacitance from the amplifier output by a small resistor R3. To eliminate a voltage drop error when current is drawn through that resistor, DC feedback is sensed on the load side of R3. High- frequency feedback is provided by C2. The load capacitance was stepped from 100pF to 1uF and the results are shown below; no gain peaking is evident. Bypass capacitors are not shown. (Circuit is created by Neil P. Albaugh TI-Tucson)
High-Capacitance Line Driver circuit:
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