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76 Threads found on Non Linear Diode
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 ?
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 (...)
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
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.)
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 (...)
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!
You can't. HFSS is an EM simulator when diodes are nonlinear components.
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.
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
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".
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 (...)
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 (...)
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 (...)
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.
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 (...)
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
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
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 (...)
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.
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
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?
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.
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
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.
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.
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.
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
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.
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.
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 ?
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.
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 (...)
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 (...)
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
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.
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.
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
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 (...)
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
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
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
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.
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
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
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 (...)
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[/
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
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 (...)
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 (...)
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