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Waveform amplifier is a very handy piece of equipment to have in the lab. Most function generator, pulse generator, and arbitrary waveform generator output voltage are limited to about 10V. Function generator output resistance is typically 50 ohm, making it not suitable driving low resistance (high current) load. For applications require higher voltage or higher current or both, a waveform power amplifier is required. For applications require to drive heavy load, the waveform output resistance must be very low (e.g. less than 1 ohm). Similarly some applications require to drive high capacitance, a laboratory power amplifier is needed. The TS200 and the TS250 are high voltage and high current amplifier for general laboratory and bench testing. It can output up to 65V (TS250-7) or can drive more than 7A (TS250-0). See our products page for additional information. This app note will use the TS200 as an example.


Figure 1 shows the functional equivalent diagram of the TS200 lab amplifier. It features a selectable AC or DC coupled input. It also feature an adjustable DC offset voltage output which is useful for LDO PSRR and line transient response testing. Two versions of the TS200 are available, the A-version has unity gain and the B-version has 20dB gain.

Waveform Amplifier for Function Generator

Application diagram showing a function generator is amplified by TS200 for driving heavy load.The TS200 waveform amplifier functional equivalent diagram. The amplifier input is AC or DC coupled.  It is ideal for lab amplifier applications.

Figure 1. TS200 waveform amplifier functional equivalent circuit.

Figure 2 shows how to amplify a function generator to drive heavy load or large capacitance. It uses the TS200 wideband power amplifier. The function generator or pulse generator output is connected the TS200 modulation input. The TS200 output is connected to the load. Typically, the TS200 DC Offset or DC output voltage is set to zero and input modulation is set to DC-couple. For the A-version of TS200 the gain is unity (gain of one). Whatever voltage output from the signal generator is buffered (current amplified) by the TS200. For the B-version of TS200 the gain is 20dB (gain of ten). Voltage at the Mod Input is amplified by a factor 10.

Figure 2. Application diagram showing a signal generator is amplified by TS200 for driving heavy load.

The TS200 modulation output can be AC-couple or DC-coupled. For the B-version, if the TS200 is set to DC-couple, both the DC voltage and AC signal are amplified by a factor of 10. If the TS200 is set to AC-couple, only AC signal is amplified while the DC output is set by the DC Offset knob.

In summary, a function generator produces the desired signal waveform and the TS200 amplifies the signal to drive high current load or high capacitive load. The TS200 amplifier is flexible enough to work with a variety of function generators, pulse generators, and arbitrary waveform generators.

 Waveform Amplifier Applications

Function generator amplifier

Pulse generator amplifier

LDO PSRR measurement

Step Response or line transient response

Drive and testing piezoelectric device

General lab power amplifier  

Waveform amplifier outputs a sinewave with 10App from a function generator.

Waveform Amplifier Typical Performance

Waveform amplifier outputs a square-wave into a heavy load from a function generator.

TS200-0A, 1-ohm load (+/-5A), 100kHz

TS200-0A, 3-ohm load, 100kHz

Related App Notes

    High Current Amplifier

    How to Measure LDO PSRR

    Op-Amp PSRR Measurement is Easy

    How to Measure Op-Amp CMRR

    Piezo Motor Driver

    Maximizing TS200 Output Current

    Quick Start Guide

PDF Version of this App Note

TS250 vs. TS200

High current amplifier for amplifying function generator output. It is ideal for amplifying current, voltage, or power.

Visit TS200 Product Page

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Visit TS250 Product Page

Waveform Amplifier with high output current for driving heavy loads such as coils, piezo actuators, capacitors, and more.

Visit TS200 Product Page

TS250 vs. TS200

Visit TS250 Product Page

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Quick Links

Amplifier Application Examples

General lab power

University R&D

Scientific and industrial testing

Driving magnetic coil

Piezo motors/actuators


Plasma physics

Optical switches and modulators

Circuit characterization

Electrolytic/Electrochemical cells


Automotive transient test