O PA820

+5V

−5V

−V

S

+V

S

R

S

50Ω

V

V

O

IN

50Ω

2.2µF

2.2µF

0.1µF

R

G

402Ω

R

F

402Ω

50Ω Source

50Ω Load

0.1µF

OPA820-HT

SBOS587

– DECEMBER 2011

www.ti.com

APPLICATION INFORMATION

Wideband Voltage-Feedback Operation

The combination of speed and dynamic range offered by the OPA820 is easily achieved in a wide variety of

application circuits, providing that simple principles of good design practice are observed. For example, good

power-supply decoupling, as shown in Figure 2, is essential to achieve the lowest possible harmonic distortion

and smooth frequency response.

Proper PC board layout and careful component selection will maximize the performance of the OPA820 in all

applications, as discussed in the following sections of this data sheet.

Figure 2 shows the gain of +2 configuration used as the basis for most of the typical characteristics. Most of the

curves were characterized using signal sources with 50-

Ω driving impedance and with measurement equipment

presenting 50-

impedance of the test generator while the 50-

the measurement equipment load. Generally, data sheet specifications refer to the voltage swings at the output

OPA820 with an effective load of approximately 90

Ω in Figure 2.

Figure 2. Gain of +2, High-Frequency Application and Characterization Circuit

16

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© 2011, Texas Instruments Incorporated

Product Folder Link(s): OPA820-HT