Circuit Laboratory HD vs RF Path

Circuit Lab HD is an electronic circuit analysis tool based on the modified node analysis method. It uses the same models of Spice. Four kind of analysis may be conducted: - DC: linear and non linear circuits with continuous voltage and current sources; - AC: linear and non linear circuits with sinusoidal voltage and current sources; - Multifrequency AC Analysis: linear and non linear circuits with sinusoidal voltage and current sources. It allows to analyze the circuit behavior in a range of frequencies. Useful to study the bandwidth of the circuit; - Transient: linear and non linear circuits, with sinusoidal and pulse voltage sources. User can graphically draw the circuit dragging and dropping components, then the circuit can be analyzed. Circuit may be controlled by means of the following gestures: - Drag: to move the circuit into the desired position - Tap on a component: to modify the component's parameters - Pinch: to zoom in and out - Double finger double Tap: to reset position and zoom level to the original values Tapping DC button, user gets voltage at each circuit's node. Tapping AC button, user gets voltage phasors at each circuit node or the bode graph of the voltage at each circuit node (see 06 BJT - Common Emitter). User can select the desired phasors to get the related graphs which may be controlled by means of the following gestures: - Drag: To move the chart in the desired position; - Pinch: To enlarge or shrinks the graph; - Double Tap with two fingers to restore the position and zoom level to the original values. Tapping Transient button, user can analyze circuit's behavior during time and get graphs of voltages and currents function of time. These graphs may be controlled by means of the following gestures: - Drag: To move the chart in the desired position; - Pinch: To enlarge or shrinks the graph; - Double Tap with two fingers to restore the position and zoom level to the original values. Moreover, user can enable a mobile cursor to read the values ​​in the different points of time (tap on the graph to display the cursor, tap to remove it and move it to read the values​​). Each circuit can contain: - Resistors - Capacitors - Inductors - Mutual coupled inductors - Independent sinusoidal voltage generators - Independent voltage pulse generators (with which you can also generate square, triangular and sawtooth waves); - Independent sinusoidal current generators - Controlled voltage generators - Controlled current generators - Operation Amplifier - Diodes - Zener Diodes - NPN and PNP Bjts - Channel-N and Channel-P JFet - Channel-N and Channel-P Mosfet In addition, there are the following measuring instruments: - Voltmeter; - Ammeter. User can manage his own components library to store most used components. For each component, a short video is available to demonstrate how to insert it into the circuit and edit it's characteristics. In addition, there are some more detailed video tutorials to learn how to use the application. Circuits may be easily stored and reused. User can print: - Circuits and component's list - Transient Analysis graphs (the mobile cursor is also printed if visible) Circuits can be easily shared through iCloud, by mail in the internal format so that can be reused by other users (on iPhone too) and in PDF format and they are compatible with Circuit Lab for Mac. Visit my site for video tutorials and details about operational amplifier's internal model, diode's internal model and Bjt's internal model.

RF Path provides propagation loss calculations for radio frequencies (RF) between 20 MHz and 20 GHz using either the Irregular Terrain model, Okumura-Hata model, COST-231 Hata Extension model, or the COST-231 Walfish-Ikegami model. The calculations are based on both electromagnetic theory and the statistical analysis of terrain characteristics to calculate the degradation of the RF wave as a function of distance and the variability of the RF wave with respect to time and space. The Irregular Terrain Model has two different prediction models. One is the Area Prediction mode which calculates propagation losses over an area where the exact terrain parameters are not known, but approximated using terrain roughness, environmental parameters and statistical parameters. The second is a point-to-point mode where specific latitude/longitude pair values are entered for both transmitter and receiver. Environmental parameters and statistical parameters are also used in this prediction mode. The results may be saved to iCloud, emailed, or posted to Facebook or Twitter. The results are in CSV format. In the Area Prediction mode a table along with a graph shows the path loss over the distance entered into the settings. The graph is viewed by rotating the device once the results table is shown. In the Point-To-Point Prediction mode a table along with a graph shows the path loss and elevation profile of the RF path.