THS4521 datasheet(23/48 Pages) TI

23 / 48 page

THS452x

49.9 W

1kW

49.9 W

OCM

IN+

Installedto

Balance

Amplifier

Open

From

50-

Source

OUT-

OUT+

ToOscilloscope

with50-

Input

S+

S-

0.22 F

THS452x

OCM

OUT

Installedto

Balance

Amplifier

Open

1:1

From

50-

Source

IN+

0.22 F

To50-

Test

Equipment

S-

S+

49.9 W

THS4521

THS4522

THS4524

www.ti.com

SBOS458D – DECEMBER 2008 – REVISED AUGUST 2010

Distortion

Slew Rate, Transient Response, Settling

Time, Output Impedance, Overdrive, Output

The circuit shown in Figure 54 is used to measure

Voltage, and Turn-On/Turn-Off Time

harmonic

and

intermodulation

distortion

the

amplifier.

The circuit shown in Figure 55 is used to measure

slew rate, transient response, settling time, output

An HP signal generator is used as the signal source

impedance, overdrive recovery, output voltage swing,

and the output is measured with a Rhode and

and ampliifer turn-on/turn-off time. Turn-on and

Schwarz spectrum analyzer. The output impedance

turn-off time are measured with the same circuit

of the HP signal generator is ac-coupled and is 50

Ω.

modified for 50-

Ω input impedance on the PD input

RIT and RG are chosen to impedance match to 50 Ω

by replacing the 0.22-mF capacitor with a 49.9-Ω

and maintain the proper gain. To balance the

resistor. For output impedance, the signal is injected

amplifier, a 0.22-mF capacitor and 49.9-Ω resistor to

at VOUT with VIN open; the drop across the 2x 49.9-Ω

ground are inserted across RIT on the alternate input.

resistors is then used to calculate the impedance

seen looking into the amplifier output.

A low-pass filter is inserted in series with the input to

reduce harmonics generated at the signal source.

The level of the fundamental is measured and then a

high-pass filter is inserted at the output to reduce the

fundamental so it does not generate distortion in the

input of the spectrum analyzer.

The transformer used in the output to convert the

signal

from

differential

single-ended

ADT1–1WT. It limits the frequency response of the

circuit so that measurements cannot be made below

approximately 1 MHz.

Figure 55. Slew Rate, Transient Response,

Settling Time, Output Impedance, Overdrive

Recovery, VOUT Swing, and Turn-On/Turn-Off Test

Circuit

Figure 54. Distortion Test Circuit

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