High Voltage amplifier is generally equipped with the "sink" function for output currents that provides constant voltage operation without regard to the type of load whether it is capacitive or conductive. (Fig.2) As it gives fast response, it is an ideal power supply for applications which require AC output.

Matsusada Precision High Voltage amplifiers are all bipolar type and can be operated in full four-quadrant area. (I, II, III, and IV area)

• Vomax: Rated output voltage
• Iomax: Rated output current

The responsivity of our high speed amplifier is determined with slew rate (SR). The step responsivity of our amplifier is as shown in fig. 3.

SR = ΔV/μS

In case of output amplitude is smaller the response time become shorter. AMP series reach to greater than SR = 700 V/µS at maximum.

Step response can be indicated with rise time. (fig.4) Usually the rise time of amplifier of response (= bandwidth) fc (Hz) is given by a formula below.

tr ≒ 0.35/fc.

The fall time tf is equals to tr.

Response of Matsusada Precision amplifiers are described as "frequency bandwidth". When swing the output with sinusoidal waveform with rated resistive load, output swing (amplitude) is reduced as input frequency become faster. Frequency response in the specification is the frequency fc is where output swing is 70% (-3 dB). (fig. 5)
In case clear output waveform is required, please select a High Voltage amplifier which has high enough frequency bandwidth against required frequency. In general, three to five times more frequency bandwidth for sinusoidal waveform, and about 10 times more for rectangular waveform, is required. In case of insufficient frequency bandwidth the output swing shall be reduced, and also the phase difference be large, so some solutions, such as monitoring output waveform, shall be required.

When a capacitive load of 100 pF or more (including stray capacitance of the output wire) is connected to power supplies, the output voltage may oscillate. In that case, install 100 Ω (at 0.1 μF) to 1000 Ω (at 1000 pF) of high voltage resistance in the output in series. Please note that the frequency band will be limited as the formula written in the right figure when an amplifier is used with a capacitive load.

Moreover, when an amplifier is used for the use such as a corona discharge, the current which is higher than rating will flow and it will affect the amplifier badly. In this case, as well as the time to use an amplifier with a capacitive load, please install the output resistance and limit the current.