Ngspice is part of gEDA project, a full GPL’d suite of Electronic Design Automation tools. QUCS CURRENT PROBE SOFTWARETwo extra resistors of 10 MΩ (R3, R4) have been added to the inputs so these stay biased and the output remains at ground level when nothing is connected to the probe. This electronics circuit simulation software is a mixed level, mixed signal circuit simulation engine, based on three open source software packages: Spice3f5, Cider1b1 and Xspice. D3 and D4 protect against wrong polarity, they’re not meant for rectifying an AC voltage! LEDs LED1 and LED2 indicate both power supply voltages are present, and the probe is active. A symmetrical laboratory power supply can be used or a small transformer with full wave rectifier and smoothing capacitors. The probe has its own voltage regulators and a common mode choke to suppress possible interferences from the DC power supply used for the probe (think of SMPS versions). The design of the layout of a circuit board will dramatically affect the amount of radiated emissions from the board. Such emissions can be a prelude to possible far field radiated emissions which can fail an EMC test. Input voltage range is limited by the +/- 15 V power supply (onboard regulators), a little over +/-12 V. This probe can be used to evaluate the near field radiated emissions from a circuit board. Would it be possible for you to add the code so that they work with Harmonic Balance. These work withall Qucs simulations except Harmonic Balance. Regarding the Qucs current and differential voltage probes. Although the AD8421 has very robust inputs, long overvoltage conditions should be avoided. I read your latest post concerning Qucs probes and their use with ngspice and Xycewith interest. The input filters (R1/C1, R2/C2) provide a simple overvoltage and transient protection for short overload conditions and correct the increase of gain of the AD8421, close to the cutoff frequency, to straighten the amplitude vs frequency characteristic of the probe. Have a look at the datasheet for more information. Even at a gain of 100 bandwidth of the AD8421 is still 2 MHz. Bandwidth at this gain is greater than 6 MHz, measured bandwidth is about 8 MHz. The amplifier is configured for a gain of 2, set by a single resistor R5: G = (9.9 kΩ/R5) + 1. Instrumentation amplifier AD8421 is used for its high bandwidth. This current probe has a differential input and single ended output. Differential current probe with single-ended output, +/-18 V supply voltage, 6 MHz bandwidth, and gain of 2, set by a single resistor, can be increased.
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