THS3095D datasheet(18/31 Pages) TI

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APPLICATION INFORMATION

WIDEBAND, NONINVERTING OPERATION

THS3091

1.21 k

Ω

49.9

Ω

0.1

µF

6.8

µF

−VS

−15 V

50-

Ω Source

0.1

µF

6.8

µF

+VS

15 V

1.21 k

Ω

49.9

Ω

50-

Ω LOAD

THS3091

THS3095

SLOS423C – SEPTEMBER 2003 – REVISED AUGUST 2004

Current-feedback amplifiers are highly dependent on

the feedback resistor RF for maximum performance

The THS3091/5 are unity gain stable 235-MHz

and stability. Table 1 shows the optimal gain-setting

current-feedback operational amplifiers, designed to

resistors RF and RG at different gains to give

operate from a

±5-V to ±15-V power supply.

maximum bandwidth with minimal peaking in the

Figure 59 shows the THS3091 in a noninverting gain

frequency response. Higher bandwidths can be

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

achieved, at the expense of added peaking in the

performance

curves.

Most

the

curves

were

frequency response, by using even lower values for

characterized using signal sources with 50-

Ω source

RF.

Conversely,

increasing

decreases

the

impedance,

and

with

measurement

equipment

bandwidth, but stability is improved.

presenting a 50-

Ω load impedance.

Table 1. Recommended Resistor Values for

Optimum Frequency Response

THS3091 and THS3095 RF and RG values for minimal peaking

with RL = 100 Ω

SUPPLY VOLTAGE

GAIN (V/V)

RG (Ω)

RF (Ω)

(V)

±15

–

1.78 k

±5

–

1.78 k

±15

1.21 k

±5

1.15 k

±15

249

1 k

±5

249

1 k

±15

95.3

866

±5

95.3

866

–1

±15 and ±5

1.05 k

Figure 59. Wideband, Noninverting Gain

–2

±15 and ±5

499

1 k

Configuration

–5

±15 and ±5

182

909

–10

±15 and ±5

86.6

866

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