THS4513 datasheet(24/34 Pages) TI

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S-Parameter, Slew Rate, Transient Response, Set-

VS+

VIN

From

source

–

49.9 W

0.22 F

RIT

VOUT+

VOUT

–

50-ohm

Test

Equipment

RCMT

RCM

THS4513

50-ohm

49.9 W

0.22 F

49.9 W

CMRR and PSRR

THS 4513

VIN

RIT

From

Ω

Source

0.22

µF

49.9

Ω

VOUT+

Open

To 50

Ω

Test

Equipment

VS+

VS−

0.22

µF

VOUT−

49.9

Ω

49.9

Ω

From

Ω

Source

THS4513

VIN

CMRR

PSRR+

PSRR−

VS+

VS−

VS+

VS−

100

Ω

100

Ω

69.8

Ω

348

Ω

348

Ω

49.9

Ω

49.9

Ω

Open

0.22

µF

100

Ω

Output

Measured

Here

With High

Impedance

Differential

Probe

CM Input

THS4513

SLOS472 – AUGUST 2005

100-

Ω termination as shown in Table 2. The input

at VOUT+ or VOUT– with the input injected at VIN, RCM =

power is increased until the output is 1 dB lower than

Ω and R

CMT = 49.9 Ω. The input impedance is

expected. The number reported in the table data is

measured with RCM = 49.9 Ω with RCMT = open, and

the power delivered to the spectrum analyzer input.

calculated by measuring the voltage drop across RCM

Add 3 dB to refer to the amplifier output.

to determine the input current.

tling Time, Output Impedance, Overdrive, Output

Voltage, and Turn-On/Off Time

The circuit shown in Figure 73 is used to measure

s-parameters, slew rate, transient response, settling

time, output impedance, overdrive recovery, output

voltage swing, and turn-on/turn-off times of the ampli-

fier. For output impedance, the signal is injected at

VOUT with VIN left open and the drop across the 49.9

Ω resistor is used to calculate the impedance seen

looking into the amplifier’s output.

Figure 74. CM Input Test Circuit

Because S21 is measured single-ended at the load

with 50-

Ω double termination, add 12 dB to refer to

the amplifier’s output as a differential signal.

The circuit shown in Figure 75 is used to measure the

CMRR and PSRR of VS+ and VS–. The input is

switched appropriately to match the test being per-

formed.

Figure 73. S-Parameter, SR, Transient Response,

Settling Time, ZO, Overdrive Recovery, VOUT

Swing, and Turn-on/off Test Circuit

Figure 75. CMRR and PSRR Test Circuit

The circuit shown in Figure 74 is used to measure the

frequency response and input impedance of the CM

input. Frequency response is measured single-ended

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