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76 Threads found on edaboard.com: Non Linear Diode

Transistor as voltage detector - Getting non-linear results

I'm using an LM395 (High reliability transistor) as a simple threshold detector. The source is half wave rectified AC (from a current loop) and through a resistive divider into the gate via a 5K resistor to prevent oscillation (per datasheet). The saturation point seems very non-linear as I vary the pot. Coule the diode be the culprit ?

Operating point of a diode

Hello all, Probably a stupid question, but I don't see how I can do to solve it... I would want to know how I can do to check the operating point of a protection schottky diode (placed in parallel with a sensor). In fact I would want to know the influence of the diode to reduce its effect (non linearity) on my sensor (...)

ADS Schottky Diode Non linear model for Mixer.

I need to design a single balanced mixer at K band using shottky diodes. I have find some available diodes, to use at this frequencies such as: Skyworks DMK2790 In the Data sheet there is a SPICE model parameter (Fig. 5 table 3) In ADS I created a file with the

simulating tunnel diode

I wish to simulate a non linear circuit having a tunnel diode. can any one suggest a simulation tool for it? (I read that APLAC provides Josephson Junction but no ideas about tunnel diode.)

How to test the S-parameter of a diode?

Hi I would like to ask that. Usually i found the diode model can be respect by resistance and capacitance. Since diode is a non-linear device. the impedance characteristic is vary with the biasing voltage. so it mean the the S-parameter also vary with the biasing voltage? When i want to test the S-parameter of a (...)

Basic Diode Question - find the diode current of the diagram

Hello, You can reduce the batteries and R's to its Thevenin equivalent. After that use the diode model you like: Ideal, Constant Voltage, Constant V and R drop or any non-linear equivalent. Hope this helps and kind regards!

how to simulate varactor or diode using hfss?

You can't. HFSS is an EM simulator when diodes are nonlinear components.

what are this 4 diode perform based on the circuit?

The non-linear V/I characteristic of the diodes is being used to progressively compress the peaks of the triangle wave so it approximates to a sine wave. Brian.

about pin diode linearity

By linearity, I assume you mean high intercept point, or low ability to generate harmonics. If you WANT to generate harmonics or intermod products, a PIN diode is a poor candidate because of the thick "I" region. For microwave signals, by the time electrons travel from one side of the I region to the other, the sine wave has already switched

analog predistorter using pin diode

Yes, but you gave no details about your application. PIN diodes function like variable resistors in RF and microwave circuits, typically >20 MHz. What do you want to do? Any variable resistance device can offer a non-linear response needed for "predistortion".

Linear V to I converter using MOS transistors

Hi all, I am designing a VCO and so I am using a V to I converter and then feed this current to ring oscilator.. Here I require a linear relation between the input voltage and the output current. I tried using a simple transistor with V in Gate and current from Drain. But since i this trans is in saturation I get a non linear (square (...)

HSMP PIN diode model

Well, it is a voltage varying capacitance, with some conversion efficiency. So in general the shunt mounted diode is going to look like a resistor in parallel with a capacitor. If you model the C(v) curve properly, a non linear analysis program will give you the diode impedance. The impedance is definately a "large (...)

p-i-n diode linearity at zero bias

Hi, I am new to p-i-n photodiodes (PD) and struggling to understand an "odd" behavior in the data - see sets of IV in attached figure. As the incident optical power level is increased the photodiode current increases ... but: (A) for some PDs the "knee" (diode opening voltage) locations (red line) stays at positive voltage and does (...)

Function Generator Design

I don't see, how you want to generate a sine wave by integrating a square wave. Obviously, you can expect a triangle wave. Sine function generators are usually based on non-linear diode networks. Low pass filters are another method. LM158JG isn't but a specific case variant.

Zener diode application...

Hi James, for my opinion the key to understand the properties as well as application principles for Z-diodes is the following: The I-V charactristic of a Z-diode is strong non-linear leading to the necessity to discriminate between static and dynamic (differential) resistances. In particular, the Z-diode (...)

why diode voltage drop is almost always equal in reverse and forward bias

When we speak about the "resistance" of a diode we always have to remember that such a semiconductor is a strong non-linear device. That means we always have to distinguish between the STATIC resistance (ratio of dc values) and the DYNAMIC (i.e. differential) resistance (ratio of small changes around the bias point, slope of the V-I characte

connecting a diode to battery directly

The typical effective resistance of fresh alkaline cylindrical batteries will be approximately 150 to 300 milliohms, depending on size. The forward conduction of a diode is highly non-linear, the small-signal diode resistance of the diode can be found using the Shockley

Detect RF input power of a diode

diodes are very non-linear. You are probably generating some DC voltage, but it is microvolts and you do not see it. You need to use an "RF" diode, probably a "zero bias" one to use with an antenna. You need a capacitor at the output that can pass DC volts, but block RF energy from travelling down the wire to the (...)

Non Linear Diode model

Hi all, I'm designing a switch from 2 -18 GHz. i've found out two diodes HPND4028 ans MP6002 for that. can anyone say me how can i get their nonlinear models or from datasheets how can i make nonlinear model which can be used in ADS for further simulation? thanks in advance.

Photodiode+sunlight+lock-in amplifier, something weird happens

Hello All, I have a set-up which consists a photodiode(non biased set-up) -> transimpedance amplifier -> sallen-key band-pass filter -> anti-aliasing filter -> ADC -> digital lock-in amplifier. In analog amplifier section, I'm referencing all ground connections(except op-amp's VSS pin) to a virtual ground. Digital lock-in amplifier locks in to a

Transistor vs diode.

Can we design an amplifier using diodes? A diode can be seen as a resistor that is strongly non-linear. That`s all. Can you find an answer by yourself?

Looking for resources on microwave mixer design

passive mixer? Is it possible? for a mixer, you must get a non-linear behavior, then you should get non-linear R/L/C? Anyone known of this, please provide docs. Thanks.

Statespace conversion to transfer func. for boost converter

Hi How can I obtain a transfer function from a state space representation when this representation is non-linear. I'm trying to obtain the transfer function of a boost converter. I've obtained the state space equations using inductor current and output voltage as my two state variables under the two different switching conditions. (One in which

whats differance between multiplier and mixer ?

A multiplier performs accurate arithmetic, Y = A * B. A mixer simply combines two signals non-linearly, usually with the goal of creating new frequency products or amplitude modulation. A mixer can be as simple as two resistors and a diode. A multiplier is a mixer too, but it's an expensive solution if all you need are some frequency products.

how to simulate the varactor c-v curve

I did that before by using ADS, but you need a non-linear varactor model first. you can search this board to get informations how to get a non-linear model if you don't have.

Non Linearity of Boost Converter Output Against Duty Cycle

I have plotted a graph of Duty Ratio against Vout of a boost converter from simulation results. I am just wondering why the non linearity ?what causes the non linearity ? and How can I improve the linearity at a range of duty cycle ie. 0.3 to 0.7 ? thank you very much.

Urgent: Help needed on impedance matching in antenna

Here I assume that is about a receiving antenna direct connected to an RF detector. First of all, in your simulation beware about power levels on the detector. The diode impedance is a function of power absorbed, so the diode impedance would change for different powers. A matching circuit would help for this problem, but I understand that you wa

Re: CAD programs for frequency multiplier designs

If you know any programs on which i could simulate a frequency multiplier circuit using a step recovery diode please inform me. non- linear CAD.

What is the purpose of resistor R in this circuit?

This circuit has low gain, which probably means that it was used for high speed design.When you turnon/off mosfet you usually need some additional time.

How to measure the voltage accurately ?

Hi All, I need to measure the Relative Humidity from a humidity sensor with a microcontroller. Problem is the sensor need to apply a ac 1V rms max and then measure the impedance, how to measure the voltage accurately? Voltage too small and can't rectify with a diode!!?? The sensor is non-linear, any algorithm to convert the voltage to RH ?

help needed : Comb Generator

I would like to get some information about modelling, simulation and fabrication of a comb generator. It has to work in frequencies above 2 GHz. I need a complete non-linear model which can be used in ADS.

The meaning of analog video on PON

Well, I know for sure it's possible to do AM modulation of the generated light. Just by changing the current bias of your laser diode, the output power changes accordingly. But as stated before, a laser diode inherently is non-linear, so your modulation quality will be mediocre. An alternative is operating the laser in CW (...)

IP3 of a filter [hlp]

Does anybody can upload a doc about their Two-Tone Approach for TOI simulation? specially for linear device. We'll if it's a linear device (linear model) you WON'T get any IMD. As biff44 said, if you want to know IP3 of a passive device you must measure it. Software is useless for this unless you have a (...)

About conversion loss of the 4th harmonic mixer

I do not know about simulations of this kind. Harmonic mixers are pumped by a lower LO power; in the non-linear elements of that mixer, harmonics are generated, and only one of them takes part in mixing function. Typically, a good mixer at the "first" harmonic LO has 6-8 dB conversion loss. At second harmonic, twice as much, 12-15 dB. At third h

current sensor for 3-phase AC motor??? help???

Other way is to swap places of diode bridge and pga. Voltage drop on diodes is betwen 0,4 and 1V and this can introduce non linear transfer caracteristic. Also diode bridge can be obmited if one pin of secundar winding is biased to Vcc/2 and rectifying is done by software.

variable resistance with other RLC parameters of an IMPATT

It should be related to the non-linear behaviour of diode. non-linear is not our focus in zeland. Zeland is specializing in EM simulations of linear circuits and antennas.

Why X'sistor Are Active Device?

Active devices have in general non-linear current-voltage characteristics, while passive only linear. diodes are an example of highly nonlinear I-V devices. X'sitor, I've never heard about

ACTIVE MULTIPLIER - current and power question

There are a couple ways to make a tripler: 1) antiparallel shottky diodes to generate the 3rd harmonic, and linear amplify after that 2) non-linear element (varactor or step recovery diode) and present the correct impedances/filtering to the element terminals to force it to triple 3) other (...)

how can i multiply two signals using common componets?

you have to build log and anti log amplifier. It so difficult. log-antilog analog mutipliers are of no use in frequency mixing. Balanced mixers (diode quartetts or analog 4-quadrant multipliers) give the best performance and a considerable suppression of input signals, which is an important advantage, if the output frequency is n

filter of the frequency multipliers

Well, in a purely abstract sort of way, one needs to drive and load a non-linear device with very specific impedances AT EACH AND EVERY FREQUENCY. A lowpass filter can be easily designed to be an open circuit at all frequencies above its cuttoff frequency, so that makes your job easy in that you know you are presenting an open circuit for all thos

small and large signal difference

Hello all, I have a very theoritical question...Where the terms "small signal" & "large signal" came from,that is why ac signals are called small and dc signals are called large?For example if we have a sinusoidal signal (ac) with amplitude 20Volts,why it is called small signal since it's amplitude is quite big/large?I would ap

Voltage Doubler Circuit with a Duty Cycle Less than 50%

No. The diodes are used for charge transfer, and the on/off durations just have to be sufficient for complete charge transfer, after which it CEASES. Furthermore, charge transfer is highly non-linear. Trying to control it via duty cycle will be unreliable.

Basics of semiconductor diodes....

Hi! I need some help understanding some basic concepts of semiconductor diodes...please,please help me by answering a few of myquestions.... 1. Why do the static and dynamic resistances of a junction diode vary with the applied voltage? 2. During forward bias,majority carriers in either side move toward the junction....d

How to drive a LED with DAC?

Just a suggestion, shouldn't you be using a PWM rather than a DAC. The voltage-current response of a LED like that of any diode is highly non linear!!! Dac wont have such a fine resolution to effectively control LED brightness. Asimov

Electronics Devices or Components

We're into the word meanings again I see. As you've said, in electronics, component is a more generic, global term that could apply equally to an integrated circuit or to a piece of wire. The term device is usually reserved for active devices, components that have a non-linear junction such as a diode, transistor or IC but can also be (...)

Active Devices & Passive Devices

I notice, that most text books classify all kind of semiconductor diodes as active devices, some are however discussing those with amplifier properties (e.g. Gunn diodes) explicitely as active diodes (e.g. Meinke/Gundlach Taschenuch der Hochfrequenztechnik). I however completely agree with LvW, that the classification is not so relevant[/

Understanding An Old Analog PSU Design

I have recently received several power supplies ranging from 8V/5A to 18V/3A and one has fantastically stable output regulation. I have done a bunch of tests and their is almost no measurable ripple and on overload the the current ever rises above the variable set point and the voltage drops without a single spike! Two others however do not have

Low cost rat-race mixer for x-band application

Initially you can use a linear simulator for designing the distributed components and LPF. After that you can use a non-linear simulator, simulating the full functioning mixer, with proper in/out impedances. Tune the output distributed components (including LPF) for maximum IF signal, and also for minimizing the RF and LO signals (at the IF (...)

Zener voltage reference

You may find a zener diode with good tolerance like 1%, but still the zener diode tolerance will be more for whole operating temperature. It would always diffcult to achieve really good performance due to variatio in non linear region of characterstics. It is always recommened to use normal diode in series (...)

The square law behavior of CMOS?

Square law of CMOS: current is a square function of the input voltage I = K (Vgs - Vth)? <- Here is the square ;-) Where K is a constant. If input voltage increases linearly, the current increases by square. For simplicity, we can ignore the threshold voltage and rewrite the equation as: I = K (Vgs)? If the input signal Vgs is