5
Chapter 1: Overview
Introduction
The TS200 Modulated Power Supply is a unique instrument for many test and
measurement applications such as LDO PSRR measurement, battery simulator,
op amp CMRR measurement, function generator amplifier, transient response
test, four-quadrant power supply, lab power amplifier and more. It is designed
for bench test and measurement. It can output DC or AC voltage or both. For
example, it can output a 3.3V DC voltage with a 300mVpp AC sinewave riding
on top of it. The TS200 features a modulation input to modulate the output to
produce any desired waveform.
Basic theory of operation
Mod
Input
Output
AC
DC
DC Offset
0dB/20dB
Figure 1. TS200 Functional Equivalent
Figure 1 shows the TS200 modulated power supply functional equivalent
diagram. It consisted of an AC-coupled or DC-coupled input, a high current
amplifier, and a DC output offset. The adjustable DC offset sets the modulated
power supply DC voltage. This DC offset feature is ideal for LDO or amplifier
PSRR measurement, because they require a DC voltage.
The TS200 input signal is selectable either AC-coupled or DC-coupled. This
allows added flexibility for TS200 to work with variety of instruments such
network analyzers and function generators.
The A-version of the TS200 modulation input gain by unity (non-inverted).
The B-version of the TS200 modulation input is amplified by a factor of 10 or
20dB. The amplifier configuration is non-inverted. The TS200 output can drive
heavy resistive load or capacitive load or both. Up to 3.5A is possible.
