100MHz, High Voltage,

SGM8301/2/4

Rail-to-Rail Output Amplifiers

9

SG Micro Corp

www.sg-micro.com

TYPICAL APPLICATION CIRCUIT

IN

+

_

200

Ω

OUT

200

Ω

75

Ω

75

Ω

Figure 1. Video Line Driver

APPLICATION

Layout and Power Supply Bypassing

The SGM8301/2/4 operate from single +4.5V to +12V or from dual ±2.25V to ±6V supplies. Bypass each supply with a

0.1µF capacitor as close to the pin as possible. SGMC recommends using micro-strip and stripline techniques to obtain

full bandwidth. To ensure that the PC board does not degrade the amplifier’s performance, design it for a frequency

greater than 1GHz. Pay careful attention to inputs and outputs to avoid large parasitic capacitance. Whether or not you

use a constant impedance board, observe the following design guidelines:



Do not use wire-wrap boards; they are too inductive.



Do not use IC sockets; they increase parasitic capacitance and inductance.



Use surface-mount instead of through-hole components for better, high frequency performance.



Use a PC board with at least two layers; it should be as free from voids as possible.



Keep signal lines as short and as straight as possible. Do not make 90° turns; round all corners.