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.

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.

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 ...

If the inverting input voltage is 3.000000V, and the non-inverting input voltage is 3.000001V, an ideal comparator will output 'high'. However, non-ideal comparators may have a mis-match, where there is an offset voltage. You can imagine this as an ideal voltage source in series with one of the comparator's inputs. See the example below.

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 …

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.

2021年2月14日 · The output of the comparator is the line from the Thres side of the circuit into the purple flip flop part. When 2V_cc/3 < Thres, the comparator goes LOW. What is the causal chain of clearly connected events which drives the output to low after this (given that the initial state was HIGH, i.e. Thres > 2V_cc/3)?

2015年10月9日 · The comparator is optimised to switch cleanly and may have less attention paid to linearity and stability under linear conditions. \$\endgroup\$ – Russell McMahon ♦ Commented Jun 17, 2013 at 1:39

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.

For purposes of understanding the circuit, think of the current sources as being resistors. The processes that make ICs are very good at making current sources within them (even better than they are at making resistors), and using current sources rather than resistors will reduce the required margin between the input voltages and V+, but for purposes of understanding …