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1. #Qucs sourceforge net how to#
2. #Qucs sourceforge net software#
3. #Qucs sourceforge net code#
4. #Qucs sourceforge net simulator#

#Qucs sourceforge net how to#

I will teach you how to do it in QUCS, We will use this circuit to see the action. Again, QUCS simulation function is not totally the same with other circuit simulation software. Now we have seen the difference between them and we know that using parameter sweep is better than simulating it every time we change the parameter value. Its is efficient and users can compare the result at the same time. Simulation result using parameter sweep simulate the each resistor value at the same time instead of simulating it one by one. Now we will use parameter sweep to simulate the result with (100. This is inefficient because we need to simulate again every time we change our resistor parameter or value. We will vary the resistance of R2 (100, 200, 300, 400, 500 ohms) and get the output voltage for every resistance value.īase on the result, every table shows the output voltage for a given value of resistance. We will simulate the circuit to determine the output voltage of resistor (R2). Later on after you understand the concept, then that is the time to have a more complex circuit. Well, I represent simple circuit to easily understand the concept. Maybe your asking "why I use this so simple circuit?". Using this simple circuit, we will compare the result in with and without parameter sweep. So you can investigate the result of all alteration of parameters. Instead of altering the parameter one by one and investigating the result individually, parameter sweep will show output with the parameter range. Parameter sweep make the alteration efficient and easy. Not only alteration of component which suites the circuit design but also the dimension or parameter of a component. In circuit analysis with the aid of simulation, it is often to do alterations of circuit design the meet the specification or intended output of the circuit. So it means, it simulate all the values of resistance with in the pre-determined range of value. Using the parameter sweep technique, users will set a range of resistance and will be sweep the parameter value with the given range. For example, for a resistor its parameter is the resistance and the output of simulation will vary if we change the parameter (resistance) of resistor. Parameter sweep is a special function in circuit simulation in which the users can set a range value of the component's parameter.

#Qucs sourceforge net simulator#

QUCS provides separate simulation technique for different circuit types while most circuit simulator provide the same simulation technique with outputs base on the circuit types. The simulation function of this circuit simulator is not common from other commercial circuit simulator.

#Qucs sourceforge net software#

This tutorial also aims to bridge the gap between users of QUCS to the software itself. This tutorial aims to teach the users or readers on how to perform a feature of QUCS simulation called parameter sweep. QUCS circuit simulator (can be downloaded at ).You will learn circuit example that needs parameter sweep for its analysis.įor the users to follow the tutorial, they will need to have the following.You will learn how to operate the parameter sweep feature of QUCS circuit simulator.You will learn what is parameter sweep.

#Qucs sourceforge net code#

I've been digging through the source code for qucs - notably mcrostrip.cpp - and I may have come across something in the conductor_losses function (line 281 in microstrip.cpp). Transcalc then tells me that the conductor loss is 1.67dB, but I think this should probably be more like 1 dB based on 12 ohms in a 50 ohm line.Īlso, when I run an S Parameters simulation on the transmission line, the S21 at 10GHz comes out at 2dB. I get ~12 ohms from my calculation and also using the Qucs formula (assuming Kr = 1 and Ki = 0.75 in the Qucs formula). My calculations based on textbooks give 0.9-1.1 dB depending on the slightly different approximations (Signal Integrity Simplified by Bogatin, and High Speed Digital Design by Howard).Ĭomparing these algorithms to the method which Qucs seems to use: Now, in the Transcalc window, these parameters give, for 10 GHz, conductor losses of 1.66dB. These other losses I am examining in isolation later. ignoring dielectric loss and roughness effects. I am trying to examine purely the conductive (i.e. I am modelling a 50 Ohm 100mm long tranmission line with Er=4.3, thickness = 35um, height above plane = 0.1 mm, track width = 0.17 mm, conductivity = 5.95e7 (resistivity = 1.68e-8), Tan delta = 0 and Roughness = 0.

I have a query regarding the way qucs calculates and simulates conductor losses in microstrip transmission lines. I have recently started using Qucs which I have found to be incredibly useful and a much more powerful and versatile tool than I was expecting.