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Output Drive Capability

The EL2075 has been optimized to drive 50

Ω and 75Ω

output drive capability makes the EL2075 an ideal choice for

RF and IF applications. Furthermore, the current drive of the

EL2075 remains a minimum of 50mA at low temperatures.

The EL2075 is current-limited at the output, allowing it to

withstand momentary shorts to ground. However, power

dissipation with the output shorted can be in excess of the

power-dissipation capabilities of the package.

Capacitive Loads

Although the EL2075 has been optimized to drive resistive

loads as low as 50

Ω, capacitive loads will decrease the

amplifier's phase margin which may result in peaking,

overshoot, and possible oscillation. For optimum AC

performance, capacitive loads should be reduced as much

as possible or isolated via a series output resistor. Coax

lines can be driven, as long as they are terminated with their

characteristic impedance. When properly terminated, the

capacitance of coaxial cable will not add to the capacitive

load seen by the amplifier. Capacitive loads greater than

the load capacitance from the amplifier output. A curve of

bandwidth without additional peaking.

Printed-Circuit Layout

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

necessary for optimum performance. Ground-plane

construction is highly recommended, as is good power

supply bypassing. A 1µF–10µF tantalum capacitor is

recommended in parallel with a 0.01µF ceramic capacitor.

All pin lengths should be as short as possible, and all bypass

capacitors should be as close to the device pins as possible.

Parasitic capacitances should be kept to an absolute

minimum at both inputs and at the output. Resistor values

should be kept under 1000

Ω to 2000Ω because of the RC

time constants associated with the parasitic capacitance.

Metal-film and carbon resistors are both acceptable, use of

wire-wound resistors is not recommended because of

parasitic inductance. Similarly, capacitors should be low-

inductance for best performance. If possible, solder the

EL2075 directly to the PC board without a socket. Even high

quality sockets add parasitic capacitance and inductance

which can potentially degrade performance. Because of the

degradation of AC performance due to parasitics, the use of

surface-mount components (resistors, capacitors, etc.) is

also recommended.

EL2075