How can I make an ideal comparator in LTspice?
2017年10月1日 · This component looks like an open switch (OFF) when the differential input voltage is greater than the threshold (Vt) and like a closed switch (ON) when the input is less than the threshold. So if Vt is set to 0 volts and the negative terminal of the output is tied to ground the SW component will act as an ideal comparator with an open drain ...
voltage - How exactly does a comparator work? - Electrical …
2015年4月11日 · The core of a comparator is usually a long-tailed pair. This is an arrangement of transistors which amplifies the difference between two signals, presents a high input impedance (especially if MOSFET), and usually somewhat rejects any common voltage. In circuit terms the long-tailed pair is close to the input of the comparator.
What is the difference between a general comparator and a …
2012年6月15日 · The term "differential comparator" essentially means "a device that compares and acts on the difference between two variables" so for a comparator to not be differential is, in the strict sense, impossible. The terms differential or (implied) non-differential are more usually used for amplifiers.
Understanding this comparator circuit for AC voltage protection
2019年7月15日 · So, the comparator will see a sine wave which matches the line voltage at the zero crossing, but will be clamped between -0.35V and 0.35V. This zero crossing is required to make a good PFC. Below a picture of the (clamped) voltages the comparator sees at …
Can someone explain how this transistor comparator works?
2015年4月10日 · Thus, a comparator consists of a subtractor and an amplifier. Conceptual circuit. Let's first build a conceptual comparator to figure out the idea. Series voltage subtractor. The simplest way to subtract two input voltages Vin1 and Vin2 is to connect their two sources in series in opposite directions.
Comparator latch circuit - Electrical Engineering Stack Exchange
2015年12月2日 · With a comparator and a D-flipflop (74hc74) use the output of the comparator (with a pull-up resitor) as flipflop CLK. Set the flipflop D=1, S=1, and use R as reset. The output of the flipflop Q is the Latched output.
How can I choose the values of comparator resistors?
2021年12月10日 · My comparator is an LM393. I calculated the reference voltage and the R3/R4 ratio using the hysteresis calculation tool on this site: calculator. So I found that the R2/R1 ratio = 15. Vref should be 0.83 V, so the R3/R4 ratio should be 5. But what should the resistor values be?
Does it matter how big the pull up resistor is for a comparator?
2021年10月20日 · The internal open-collector transistor of the comparator is able to pull its output down to 0V very quickly, but for the output to transition from low to high state, you are relying on R to source all current needed to charge C. Obviously, the lower R is, the more quickly the output can slew to a high voltage.
LM358 (as comparator) output voltage less than supply voltage
2016年5月23日 · I've setup a simple circuit with an LM358 configured as a comparator (the ground rail and supply connections are off screen). Schematic: Breadboard: (in case I wired something wrong) Measured va...
Comparator simple build - Electrical Engineering Stack Exchange
2020年7月23日 · The comparator is just a simple MOSFET where the output is connected to VCC and drain and the V+ pin is connected to the gate of the MOSFET and the source is connected to the source of the MOSFET. When the difference between V+ and V- is greater than the threshold voltage of the MOSFET and V+ has bigger voltage than V- it turns on.