This article takes the TLV3501 zero-crossing comparator circuit design as an example, and briefly explains the methods and ideas of the zero-crossing comparator circuit design. I hope to help you design the comparator circuit.
Zero-crossing comparator circuit
The zero-crossing voltage comparator is the basic structure of the voltage comparison circuit, which converts the AC signal into a bipolar rectangular wave of the same frequency. Commonly used to measure the frequency phase of a sine wave.
Zero-crossing comparator circuit diagram, as shown below:
Zero-crossing comparator circuit design method and steps:
The following zero-voltage comparator circuit is designed by itself. The inverting input terminal is grounded, and the 1kHz and 1V sine wave signals are connected to the non-inverting input terminal. The output waveform and voltage transmission characteristic curve are measured and plotted.
Design the circuit below
(1) OrCAD simulation
The scan settings and results are as follows:
In order to measure the rise time, the image is partially enlarged
Rise time is 0.66us
(2) Building a circuit
The signal source settings are as follows:
Observe the output waveform as follows:
Measuring the rise time of this signal with Measure is 2.4us
Finally, add some relevant knowledge of the comparator for your reference.
The difference between a comparator (also called a voltage comparator) and an operational amplifier:
The comparator looks like an op amp in an open-circuit configuration, but the comparator and op amp have many differences in electrical performance parameters. The op amp can be used as a comparator in principle without negative feedback, but the comparator has a faster response speed than the op amp, the transmission delay time is smaller than the op amp, and the TTL can be directly driven without the need of an external limiting circuit. Digital integrated circuits such as CMOS. However, some op amps (eg LM324, LM358, μA741, TL081, OP07, OP27, etc.) can be considered as comparators when the requirements are not high.
The basic voltage type of the comparator:
The basic circuit types of the comparator are: zero-crossing voltage comparator, single-threshold comparator, single-supply comparator with positive reference voltage, current addition comparator, hysteresis voltage comparator, etc.
Common Mode Choke (line Filter)
Common mode choke coils are used to suppress common mode noise. This type of coil is produced by winding the signal or supply wires one ferrite core. Since magnetic flux flows inside the ferrite core, common mode choke coils work as an inductor against common mode current. Accordingly, using a common mode choke coil provides larger impedance against common mode current and is more effective for common mode noise suppression than using several normal inductors.
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Common mode Inductor, also known as common mode choke, is commonly used in computer switching power supplies to filter common mode electromagnetic interference signals. In the board design, the common mode inductor also acts as an EMI filter to suppress the electromagnetic radiation generated by the high-speed signal line from radiating outward.
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T38×19×13 |
||
|
Dimention(mm) |
Pin Quantity(pcs) |
Pin Array(mm) |
| 50*35*53 | 6 | 18/25 |
| Resistance(MAX) | Inductance | Test Condition |
| L1-2=L4-3=L5-620mΩ | L1-2=L4-3=L5-6=1.0mH MIN 100K,1V | 100KHZ/1V |
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