THS4001

270-MHz HIGH-SPEED AMPLIFIER

SLOS206A– DECEMBER 1997 – REVISED MARCH 1999

14

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

APPLICATION INFORMATION

circuit layout considerations (continued)

D Surface-mount passive components – Using surface mount passive components is recommended for high

frequency amplifier circuits for several reasons. First, because of the extremely low lead inductance of

surface-mount components, the problem with stray series inductance is greatly reduced. Second, the small

size of surface-mount components naturally leads to a more compact layout thereby minimizing both stray

inductance and capacitance. If leaded components are used, it is recommended that the lead lengths be

kept as short as possible.

evaluation board

An evaluation board is available for the THS4001 (literature number SLOP119). This board has been configured

for very low parasitic capacitance in order to realize the full performance of the amplifier. A schematic of the

evaluation board is shown in Figure 23. The circuitry has been designed so that the amplifier may be used in

either an inverting or noninverting configuration. To order the evaluation board contact your local TI sales office

or distributor. For more detailed information, refer to the THS4001 EVM User’s Manual (literature number

SLOU017).

_

+

THS4001

VCC –

VCC+

C3

6.8

µF

C4

0.1

µF

C1

6.8

µF

C2

0.1

µF

R1

1 k

Ω

R5

1 k

Ω

R3

49.9

Ω

R2

49.9

Ω

R4

49.9

Ω

IN –

IN +

NULL

OUT

NULL

+

+

Figure 23.