THS3095D datasheet(20/46 Pages) TI2

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8.4 Device Functional Modes

8.4.1 Wideband, Noninverting Operation

The THS309x are unity gain stable 715-MHz current-feedback operational amplifiers designed to operate from

a ±5-V to ±15-V power supply. Figure 8-2 shows the THS3091 in a noninverting gain of 2-V/V configuration

typically used to generate the performance curves. Most of the curves were characterized using signal sources

with a 50-Ω source impedance, and with measurement equipment presenting a 50-Ω load impedance.

THS3091

1.21 kΩ

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 kΩ

49.9 Ω

50-Ω LOAD

Figure 8-2. Wideband, Noninverting Gain Configuration

Current-feedback amplifiers are highly dependent on feedback resistor RF for maximum performance and

stability. Table 8-1 shows the optimal gain-setting resistors RF and RG 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 RF. Conversely, increasing RF

decreases the bandwidth, but improves stability.

Table 8-1. Recommended Resistor Values for Optimum Frequency Response

THS3091 AND THS3095 RF AND RG VALUES FOR MINIMAL PEAKING WITH RL = 100 Ω

GAIN (V/V)

SUPPLY VOLTAGE (V)

RG (Ω)

RF (Ω)

±5 and ±15

—

1.78 k

±5

1.15 k

±15

1.21 k

±5 and ±15

249

1 k

±5 and ±15

95.3

866

–1

±5 and ±15

1.05 k

–2

±5 and ±15

499

1 k

–5

±5 and ±15

182

909

–10

±5 and ±15

86.6

866

THS3091, THS3095

SLOS423K – SEPTEMBER 2003 – REVISED APRIL 2023

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