There are many types of electronic products, and it is easy for overvoltage, overcurrent, or surge to occur in the circuit, which can cause damage to it. However, with the development of technology, the diversity and complexity of electronic products have led to the development of circuit protection components from the simplest fuses to various targeted and more superior protective components, such as ESD static diodes, TVS tubes, GDT discharge tubes, PPTC self-healing fuses, varistors, etc
A diode limiting circuit can cut off a portion of the signal, but it will not affect the remaining signal. Today, we will learn another diode based circuit that can lift or lower the input waveform above or below a certain DC reference level without changing the shape of the input signal waveform. This circuit is called a diode "clamp" circuit. The clamp circuit is also known as a DC restorer.
The volt ampere characteristic refers to the relationship between the voltage u applied across the diode and the current flowing through the diode, I=f（U）。 The volt ampere characteristics of 2CP12 (ordinary silicon=cathode tube) and 2AP9 (ordinary germanium diode).
What is TVS
The main application areas of Schottky diodes are switching power supplies or SMPS, with operating frequencies exceeding 20 kHz.
When the frequency is an AC signal input to a nonlinear component diode transistor, the original sine wave signal will generate DC, fundamental components, and second and third harmonic components. Then, through a frequency selection network, the desired frequency band can be selected to obtain the desired frequency band signal for multiplication.
