EL400 Просмотр технического описания (PDF) - Intersil

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производитель

EL400

200MHz Current Feedback Amplifier

Intersil 

Equivalent Circuit

EL400

Burn-In Circuit

All Packages Use The Same Schematic.

Applications Information

Theory of Operation

The EL400 has a unity gain buffer from the non-inverting

input to the inverting input. The error signal of the EL400 is a

current flowing into (or out of) the inverting input. A very small

change in current flowing through the inverting input will cause

a large change in the output voltage. This current

amplification is called the transimpedance (ROL) of the

EL400 [VOUT = (ROL)*(-IIN)]. Since ROL is very large, the

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current flowing into the inverting input in the steady-state

(non-slewing) condition is very small.

Therefore we can still use op-amp assumptions as a first-

order approximation for circuit analysis, namely that:

1. The voltage across the inputs is approximately 0V.

2. The current into the inputs is approximately 0mA.

Resistor Value Selection and Optimization

The value of the feedback resistor (and an internal capacitor)

sets the AC dynamics of the EL400. The nominal value for

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