3
１－６ Characteristics of bi-polar amplifier
Capacitive load
Capacitive load may cause oscillation when it is more than 100pF. In such case, insert 1Ω
(10μF)～1kΩ（1000pF）power resistance in series with the output. Be careful that the
frequency bandwidth is limited depending on the resistance inserted in series in series and
the capacity under capacitive load.
Inductive load
Some inductance of inductive load may cause resonance in CC mode.
In such cases, connect a C-R series circuit between output terminals to prevent
resonance.
Response speed
When accurate output waveforms are required, select a bi-polar amplifier with a frequency
bandwidth adequately higher than the used frequency. In case of using in sine waves, 3 to 5
times quick frequency bandwidth is required, and around 10 times quick one is required in
case of using in square waves in general. Inadequate bandwidth causes not only decrease in
the output amplitude but much difference between the input and output phase. Therefore
attention must be paid by using the product while monitoring the output waveforms.
1 Introduction
100％
DC
0dB
3dB
0.01fc 0.1fc 0.5fc fc
f(Hz)
70％
92％
0