Falstad Circuit (2024)

FAQs

What is the threshold voltage in Falstad? ›

The threshold voltage is 1.5V.

Hover over the lower-left resistor, right-click and choose View in Scope. The voltage vs. time of that resistor is now plotted in the scope view at the bottom of the window.

Digital circuit simulation involves the use of simpler models of the electronic circuit. These models are typically created using HDL. In digital simulation, rather than propagating continuously varying signals, a few discrete voltage levels (primarily logic 0 and logic 1) are propagated.

Diodes have a minimum threshold voltage (or Vth , usually around 0.7V) that must be present between the anode and cathode in order for current to flow. If the anode voltage is not at least Vth greater than the cathode voltage, no current will flow through the diode, as shown in Fig.

Assuming a steady current flow (as opposed to a shock from a capacitor or from static electricity), shocks above 2,700 volts are often fatal, with those above 11,000 volts being usually fatal, though exceptional cases have been noted.

If you limit yourself to certain components like resistors, capacitors, switches, and inductors (bearing in mind the limitation mentioned above), the Falstad simulator will do a very nice job of simulating things. It's also pretty good for simulating simple logic circuits, though its library of chips is rather limited.

If you want to see the waveform, current consumption, power or voltage, the scope tool can be used. This can be used on most of the components excluding some such as Triodes. To see a components waveform in the scope, you can right click the component and select "View in Scope".

CircuitLab is a web-based simulator that requires no download or installation, utilizes an intuitive build/simulate methodology, offers a generous array of capabilities in a free version, is inexpensive to upgrade, and has been implemented successfully in circuit analysis classes at Saint Leo University.

EveryCircuit is free to download and use. There is an option to purchase the Full Version of EveryCircuit that allows you to build and simulate large circuits, save unlimited number of circuits, store them on cloud, and sync between your devices. It is available via a one time in-app purchase for $14.99.

A clock (better represented as clk) is a signal which is used to make the flipflop work at its positive or negative edge (in exceptional case both edge) in the digital system. But, an enable is a signal which makes the flipflop function as long as it is high (1).

Is EasyEDA free to use? ›

EasyEDA is free and permits commercial usage, with no disparity in features for individuals or businesses.

There are different types of circuit simulators that cater to various needs across the accuracy-performance/capacity spectrum. At one end of the spectrum are analog simulators that offer high accuracy and solve accurate representations of electronic circuits. They are commonly used for simulating small circuits.

SPICE Simulation Tools. By far the most popular simulation tool for students and circuit designers in industry is PSpice. PSpice is an evolution of the Simulation Program with Integrated Circuit Emphasis which originated at Berkeley in the 1970s. The initial intent was to model and simulate integrated circuits (ICs).

The threshold voltage is the voltage over which, depending on the technology, a certain phenomenon happens. The threshold voltage of a MOSFET is the value of the gate voltage when a conductive band forms between the transistor's source and drain. After the threshold voltage, a large quantity of current begins to flow.

A threshold is the voltage at the boundary between “0 (Low)” and “1 (High)” in mainly digital circuits. When a voltage higher than the threshold is applied to the IC input terminal, it is recognized as being “High.” When the voltage is lower than the threshold, it is recognized as being “Low.”

The threshold voltage, commonly abbreviated as V_th or V_GS(th), of a field-effect transistor (FET) is the minimum gate-to-source voltage (V_GS) that is needed to create a conducting path between the source and drain terminals. It is an important scaling factor to maintain power efficiency.

With a body bias, the threshold voltage is given by: (3.16) V T = V F B + 2 ϕ F + γ 2 ϕ F + V B . As shown in the above equation, the threshold voltage increases when a back bias is applied. A positive bias on the substrate results in a wider depletion region and assists in balancing the gate charge.