Texas Instruments THS3201 Evaluation Module THS3201EVM THS3201EVM Fiche De Données

Ω

Ω

 µ

 µ

Ω

 µ

 µ

Ω

Ω

Ω

Ω

 µ

 µ

Ω

 µ

 µ

Ω

Ω

Ω

Ω

SLOS416C – JUNE 2003 – REVISED JUNE 2009

.............................................................................................................................................................

The

THS3201

is

a

unity-gain

stable,

1.8-GHz

current-feedback operational amplifier, designed to

operate from a ±3.3-V to ±7.5-V power supply.

shows the THS3201 in a noninverting gain

±7.5

—

1.2 k

1

of 2-V/V configuration typically used to generate the

±5

—

1.2 k

performance

curves.

Most

of

the

curves

were

±7.5

768

768

characterized using signal sources with 50-

Ω source

2

±5

715

715

impedance,

and

with

measurement

equipment

presenting a 50-

Ω load impedance. The 49.9-Ω shunt

±7.5

154.9

619

5

resistor at the V

I

terminal in

matches the

±5

143

576

source impedance of the test generator.

±7.5

54.9

487

10

±5

51.1

464

±7.5

619

619

–1

±5

576

576

–2

±7.5 and ±5

287

576

–5

±7.5 and ±5

110

549

–10

±7.5 and ±5

49.9

499

shows the THS3201 in a typical inverting

gain

configuration

where

the

input

and

output

impedances and signal gain from

are

retained in an inverting circuit configuration.

Unlike voltage-feedback amplifiers, current-feedback
amplifiers are highly dependent on the feedback
resistor R

F

for maximum performance and stability.

shows the optimal gain setting resistors R

F

and R

G

at different gains to give maximum bandwidth

with minimal peaking in the frequency response.
Higher bandwidths can be achieved, at the expense
of added peaking in the frequency response, by using
even lower values for R

F

. Conversely, increasing R

F

decreases the bandwidth, but stability is improved.

16

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