![]() When the output is off, or in the logic “low” state, the output voltage equals the supply common voltage level, in effect “pulling” or “sinking” the output signal from the load. When the output is active, in the logic “high” state, the output voltage equals the supply voltage, so the transistors are “pushing” or “sourcing” the output signal to the load. ![]() Incremental encoders with high transistor logic (HTL) output generate the output signal using two transistors in a totem-pole configuration. ![]() Incremental encoders can provide any of several types of digital output signals, but the two most common are high transistor logic (HTL) and and transistor-transistor logic (TTL). Incremental encoders for digital output signals Those that produce digital output signals are typically referred to as simply “incremental encoders,” while those that produce analog output signals are referred to as “sine-cosine encoders.” These output signals can be in the form of analog sine and cosine waves or in the form of digital square waves. Encoders that provide incremental position measurements (whether rotary or linear) output two signals, or channels, typically termed “A” and “B,” to provide position and direction information.
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