Limiter means that the signal voltage can be flattened according to the limited rangeamplitudeIt is also called clipper.The function of the amplitude limiting circuit is to limit the amplitude of the output signal to a certain range, that is, when the input voltage exceeds or falls below a certain reference value, the output voltage will be limited to a certain level (called the amplitude limiting level) and will not change with the input voltage.
Chinese name
limiter
Foreign name
Limiter
Also called
Clipper
Interpretation
Flatten the signal voltage according to the limit rangeamplitudeCircuit of
① Shaping, such as cutting the interference at the top or bottom of the output waveform.
② Waveform transformation, such as cutting the positive pulse in the output signal, leaving only the negative pulse.
③ For overvoltage protection, if strong output signal or interference may damage a component, the amplitude limiting circuit can be connected in front of the component.
Classification of limiting circuits
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1、 The limiting circuit can be divided into upper limit limiting circuit, lower limit limiting circuit and two-way limiting circuit according to its function.
1. In the upper limit limiting circuit, when the input signal voltage is lower than a predetermined upper limit voltage, the output voltage will increase or decrease with the input voltage;However, when the input voltage reaches or exceeds the upper limit voltage, the output voltage will remain a fixed value and will no longer change with the input voltage. In this way, the signal amplitude will be limited at the output end.
2. The lower limit limiting circuit produces limiting effect when the input voltage is lower than a certain lower limit level.
3. Bidirectional limiting circuit will limit the amplitude in both directions when the input voltage is too high or too low.
2、 The limiter is divided into diode limiting circuit and triode limiting circuit according to the circuit composition.
1. The diode limiting circuit uses the clamping effect of the diode to achieve clipping and limiting.
2. The triode limiter can also form a limiting circuit by using the cut-off and saturation characteristics of the triode, and this kind of circuit also has the amplification function.In order to meet some higher technical requirements, integrated operational amplifiers can also be used to form limiting circuits.
