Broadband CATV Amplifier,

50 - 1000 MHz

MAAMSS0031

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the product(s) or information contained herein without notice.

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the suitability of its products for any particular purpose, nor does

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4

V2

Schematic Including Off-Chip

Components

Enhanced Input Return Loss (IRL) and Gain Flatness

An enhanced input return loss and improved gain flatness circuit has been developed for applications where those

parameters are key to system performance. Adding a series inductor, L3, to the input, a shunt capacitor, C5, to the output,

and changing the bias inductor, L1, value will improve the input return loss to 25 dB typical from 50 to 1000 MHz. The gain

flatness will also improve to less than 0.3 dB from 50 to 1000 MHz.

C1

L1

C3

C2

VDD

Pin 1

L2

C4

R1

L3

C5

Recommended Board Layout

Off-Chip Component Values

Component

Value

Package

C1

0.01 µF

0402

C2

0.01 µF

0402

C3

0.01 µF

0402

C4

0.01 µF

0402

C5

0.5 pF

0402

L1 *

1000 nH

1210

L2

8.2 nH

0402

L3

5.6 nH

0402

R1

523 Ω

0402

* L1 supplied from EPCOS, part number B82422A1102K100.