MAX3510 데이터 시트보기 (PDF) - Maxim Integrated

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MAX3510

Upstream CATV Amplifier

Maxim Integrated 

Upstream CATV Amplifier

VIN+

2kΩ

1.1pF

VIN-

Figure 3. Equivalent Input Circuit

The model for the MAX3510 input impedance is shown

in Figure 3.

Layout Issues

A well-designed printed circuit board is an essential

part of an RF circuit. For best performance pay atten-

tion to power-supply layout issues as well the output

circuit layout.

Output Circuit Layout

The differential implementation of the MAX3510’s out-

put has the benefit of significantly reducing even-order

distortion, the most significant of which is 2nd-harmonic

distortion. The degree of distortion cancellation

depends on the amplitude and phase balance of the

overall circuit. It is critical that the traces that lead from

the output pins be exactly the same length.

Power-Supply Layout

For minimal coupling between different sections of the

IC, the ideal power-supply layout is a star configuration.

This configuration has a large-value decoupling capac-

itor at the central power-supply node. The power-sup-

ply traces branch out from this node, each going to a

separate power-supply node in the MAX3510 circuit. At

the end of each of these traces is a decoupling capaci-

tor that provides a very low impedance at the frequen-

cy of interest. This arrangement provides local power-

supply decoupling at each power-supply pin.

The power supply traces must be made as thick as

practical to keep resistance well below 1Ω.

Ground inductance degrades distortion performance.

Therefore, ground plane connections to GND1 and

GND2 should be made with multiple vias if possible.

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