What does the symbol mean?what is this comparator difference?what is its function?can anyone introduce it to me?
Electronic – what does this symbol mean?(like a comparator,but there is another symbol in this triangle)
schematicssymbol [~]
Related Solutions
The diagram on page 631 of the user guide has it labeled "Temp. Sensor".
This is the internal Block Diagram for the SD24_A ADC, but it's almost functionally the same for the other ADC Types
It is an ESD clamp, showing that the gate is ESD protected. Typically the back to back diodes are shown as Zeners. This scheme protects against positive and negative ESD hits.
In the event of a positive ESD event, the top diode is forward biased, and the bottom diode's reverse breakdown voltage will be exceeded. The ESD is shunted to the source, which is often ground.
In the event of a negative ESD event, the top diode's reverse breakdown voltage is exceeded, and the bottom diode is forward biased. The ESD is again shunted to the source.
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Best Answer
Schematic Symbol for a comparator with hysterisis or Schmitt trigger.
simulate this circuit – Schematic created using CircuitLab
A shifted zero-crossing detector to deal with a noisy input.
Comparators have high gain, so a zero-crossing detector would transition between the rails for a signal oscillating near the reference.
You shift the reference point once it is crossed so the circuit is less susceptible to noise. Noise has to be greater that \$ V_{HYS} = 2 \times V_{UTP} \$ to cause a state change.
$$V_{UTP} = \frac {R_2} {R_1 + R_2} V_{CC} $$
Once Upper Trigger Point (Red) is reached, op-amp changes to \$V_{OUT}\$ shifting reference to Lower Trigger Point (Blue). Noise would have to be larger than Lower Trigger Point to transition.