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Driving Capacitive Loads with Trek Amplifiers

In applications which involve driving capacitive loads, the useful bandwidth of the amplifier is often limited by the peak output current capability of the amplifier rather than the amplifier's AC gain bandwidth characteristics.

Engineers at Trek have designed many amplifiers with various voltage and current levels which can be used to drive capacitive loads. The table at the bottom of this page lists selected Trek Amplifiers with their voltage and current ranges. The internal capacitance of each amplifier is in the X pF (pico farad) column. To determine which Trek Model amplifier is most suitable for your application:
1.  Substitute the peak voltage that will be applied to your load into the appropriate equation for      driving capacitive loads with sine, triangle, or square waves. Use the table below to select the Trek amplifier with the appropriate voltage or current characteristics.
2.  Select the correct internal output capacitance value for the selected Trek amplifier from the X pF (pico farad) column and substitute the value into the X pF variable of the equation.

3.  Substitute the capacitive value of your load (C load ) into the equation.

4.  Substitute the desired frequency f or rise time dt (square wave) of the output waveform into the equation.

5.  Solve for the peak current needed from the amplifier.

If the calculated peak current is equal to or less than the peak current range of the amplifier, the Trek amplifier will not be bandwidth limited due to output current limitations. For example, if the calculated peak current is equal to or less than 20 mA, the Model 20/20C will not be bandwidth limited due to output current limitations.

To help you select the appropriate amplifier, download the following application:    Driving Capacitive Loads Calculator

 

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Model X pf Output Current Output Voltage
10/10B 40 pF ±10 mA DC or peak AC ±10 kV DC or peak AC
609E-6 40 pF ±20 mA DC or peak AC ±4 kV DC or peak AC
20/20C 60 pF ±20 mA DC or peak AC ±20 kV DC or peak AC
30/20 100 pF ±20 mA DC or peak AC ±30 kV DC or peak AC
10/40 60 pF ±40 mA DC or peak AC ±10 kV DC or peak AC
5/80 70 pF ±80 mA DC or peak AC ±5 kV DC or peak AC

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Updated on : novembro 01, 2015