In MOS tubes, parasitic capacitance refers to the capacitance between the gate, drain and source of the MOS tube, which can cause the MOS tube to have adverse effects at high frequencies, such as reducing the gain of the amplifier. Methods to eliminate parasitic capacitance of MOS tubes include:
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1. Choose the right MOS tube: Choosing a MOS tube with low parasitic capacitance is a way to eliminate parasitic capacitance. For example, in some high-frequency applications, MOS tubes of GaAs or InP materials can be used, which typically have low parasitic capacitance.
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2. Using inductors: Adding inductors between the MOS tube source and drain can inhibit the influence of parasitic capacitance. This method requires the selection of appropriate inductors, such as miniature coils or inductors.
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3. Add negative feedback: Negative feedback is one of the effective ways to eliminate parasitic capacitors, which can offset the influence of parasitic capacitors in MOS tubes on circuit performance. The effect of parasitic capacitance can be eliminated by incorporating suitable negative feedback into the circuit.
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4. Optimized layout: When designing MOS circuit, reasonable layout can also help eliminate the influence of parasitic capacitance. For example, the source and drain of the MOS tube can be placed close to some ground, and the circuit elements around the gate can be minimized.
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It should be noted that different applications need to use different methods to eliminate parasitic capacitance. If you are not familiar with this area, it is recommended to consult a professional.