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Burn-In Circuit

Printed Circuit Layout

As with any high-frequency device, good PCB layout is

necessary for optimum performance. This is especially

important for the EL2072, which has a typical bandwidth of

730MHz. Ground plane construction is a requirement, as is

good power-supply bypassing close to the package. A

closely-placed 0.01µF ceramic capacitor between each

supply pin and the ground plane is usually sufficient

decoupling.

Pins 2, 3, 6, and 7 should be connected to the ground-plane

to minimize capacitive feedthrough, and all input and output

traces should be laid out as transmission lines and

terminated as close to the EL2072 package as possible.

Increasing capacitance on the output of the EL2072 will add

phase shift, decreasing phase margin and increasing

frequency-response peaking. A small series resistor before

the capacitance decouples this effect, and should be used

for large capacitance values. Please refer to the graphs for

the appropriate resistor value to be used.

EL2072