8

EL400C

200MHz Current Feedback Amplifier

Printed Circuit Layout

As with any high frequency device, good PCB layout is

necessary for optimum performance. Ground plane con-

struction is a requirement, as is good power-supply and

Offset Adjust bypassing close to the package. The

inverting input is sensitive to stray capacitance, there-

fore connections at the inverting input should be

minimal, close to the package, and constructed with as

little coupling the ground plane as possible.

Capacitance at the output node will reduce stability,

eventually resulting in peaking, and finally oscillation if

the capacitance is large enough. The design of the

EL400C allows a larger capacitive load than comparable

products, yet there are occasions when a series resistor

before the capacitance may be needed. Please refer to

the graphs to determine the proper resistor value needed.