Engineering Knowledge

Op amp:

Operational amplifier: The ideal op amp is an amplifier with infinite input impedance, infinite open-loop gain, zero output impedance, infinite bandwidth, and zero noise. It has positive and negative inputs which allow circuits that use feedback to achieve a wide range of functions.

Open Collector:

Refers to both NPN and PNP transistor devices with no components connected to the collector. When a load is connected to an open collector sensor it acts as a SPST (single pole single throw) switch.

Open Drain:

In MOSFET transistor, an open drain terminal is connected to ground in the low voltage (logic 0) state, but has high impedance in the logic 1 state.  See Open Collector.

Optoelectronics:

An electronic devices that interact with light. In general, it's electrical-to-optical or optical-to-electrical transducers.

Output to Input Ratio:

The ratio between the sensed current and the output current of the amplifier.