Calculation method of diode junction capacitance

A calculation method, diode junction technology, applied in capacitance measurement, measurement of electrical variables, measurement of resistance/reactance/impedance, etc., can solve problems such as complex calculation methods, achieve the effect of reducing complexity and having universal applicability

Pending Publication Date: 2021-08-13
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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Problems solved by technology

[0013] In view of this, the present invention proposes a calculation method for diode junction capacitance, which replaces ω with a measurable physical quantity, so that the junction capacitance value of a diode at any frequency can be calculated re

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  • Calculation method of diode junction capacitance
  • Calculation method of diode junction capacitance
  • Calculation method of diode junction capacitance

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Embodiment Construction

[0027] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0028] A specific embodiment of the present invention proposes a method for calculating diode junction capacitance, including the following steps A1-A7:

[0029] A1. Under the preset modulation frequency and preset bias voltage V, measure the apparent capacitance value C of the diode p , apparent conductance value G p , the real part R of the S11 parameter S11 and imaginary part X S11 and the voltage-current data pair V-I.

[0030] Wherein, the preset modulation frequency can be in the range of 0-5MHz, and does not include 0; the preset bias voltage is in the range of 0-V max In the range of volts, and does not include 0; where V max Indicates the maximum DC voltage that the diode can withstand. The S11 parameter is one of the S parameters, which represents the return loss characteristic. Generally, the dB value and impedance characterist...

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Abstract

The invention discloses a diode junction capacitance calculation method. The method comprises the following steps: A1, measuring an apparent capacitance value, an apparent conductivity value, an S11 parameter real part, an S11 parameter imaginary part and voltage-current of a diode; A2, calculating a real part and an imaginary part of diode impedance by using the real part and the imaginary part of the parameter S11; A3, according to the impedance relation between the two equivalent circuits of the diode, obtaining calculation formulas of junction capacitance and series resistance; A4, setting an initial junction conductance value Ginit; A5, substituting the initial junction conductance value into the junction capacitance calculation formula to obtain a current junction capacitance value; A6, substituting the current junction capacitance value and the initial junction conductance value into the series resistance calculation formula to obtain a current series resistance value, obtaining a voltage applied to the junction conductance or the junction capacitor according to a voltage-current relationship, and obtaining a current junction conductance calculation value G' according to a conductance formula; and A7, judging whether the difference value between the Ginit and the G' is smaller than a preset threshold value or not; if so, taking the current junction capacitance value as the final value of the junction capacitance; and if not, making Ginit to be equal to G', and executing the step A5 again.

Description

technical field [0001] The invention relates to the technical field of electronic components, in particular to the technical field of semiconductor devices, and in particular to a method for calculating diode junction capacitance. Background technique [0002] Usually the diode can be equivalent to figure 1 The equivalent circuit shown in (a) is composed of junction capacitance C, junction conductance G and series resistance r s composition. In a diode capacitance measurement setup, the figure 1 (b) The parallel equivalent circuit shown, that is, the diode is equivalent to parallel apparent conductance Gp and apparent capacitance Cp. Usually the idea of ​​calculating capacitance is as follows: [0003] because figure 1 (a) with figure 1 (b) The circuit is also a diode equivalent circuit, so the impedance of the two circuits is equal, that is: [0004] [0005] [0006] Among them, ω represents the frequency of the alternating current applied to the diode during ...

Claims

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Application Information

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IPC IPC(8): G01R27/26
CPCG01R27/2605
Inventor 董宇涵马克铭张石曹智渊
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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