Could some electronics guru here please clarify this ? S{OCE AC analysis allows measurement of small signal s parameters. Using these measured...

Could some electronics guru here please clarify this ? S{OCE AC analysis allows measurement of small signal s parameters. Using these measured values, the elements of the impedance matrix(Z matrix - Z11, Z12, Z21 and Z22) cam be calculated(messy but straightforward calculation, done easily with C code) Once the elements of the Z matrix have been calculated, the input, output impedan

Some LT Spice models have invisible internal nodes that are hard ground. So you can't float them off ground. LTC4444 mosfet driver for...

Some LT Spice models have invisible internal nodes that are hard ground. So you can't float them off ground. LTC4444 mosfet driver for example, half-bridge with + and - power rails. Bummer. I'll just fake the gate driver with a couple of BVs. That will run faster anyhow. I guess I could run the 4444 grounded and AC couple into the gates with DC restore. Lotta hassle. -- ...

The Cree silicon carbide fet Spice model has 5 pins: Source, Gate, Drain, Tc, and Tj. Tc and Tj represent the case and junction...

The Cree silicon carbide fet Spice model has 5 pins: Source, Gate, Drain, Tc, and Tj. Tc and Tj represent the case and junction temperatures. Each, I think, outputs a current of 1 amp per watt dissipated, and the voltage at each pin is the temp in degrees C. These voltages and currents are apparently relative to absolute ground, not the source pin or anything. Cree says to drive the...

Hi, The input DC voltage is in the range of 1.2 volts to 40 volts. I need 3.3 volts output and 300mA. So. I decided to use LT3759. LT3759's...

Hi, The input DC voltage is in the range of 1.2 volts to 40 volts. I need 3.3 volts output and 300mA. So. I decided to use LT3759. LT3759's data sheet is at the following link http://cds.linear.com/docs/Datasheet/3759fa.pdf Plan is to configure the LT2759 to generate 5 volts @ 300mA and then use LT 1962 to generate 3.3 Volts at 300mA. 300mA is maximum but load will work between 150mA to...

Given a folder C:\Protos, I want a batch file to find all sub-folders, possibly a few levels deep, called OLD, and delete all of them....

Given a folder C:\Protos, I want a batch file to find all sub-folders, possibly a few levels deep, called OLD, and delete all of them. I can't make that work. When we develop a prototype PCB, we name iterations board1, board2, etc, and drag the old ones into an OLD folder until it's done. Spice folders get a OLD sub-folder too. Windows batch files don't make a lot of sense to me. T...

What's an easy way to plot the C-V curve of a back-biased diode? Maybe a constant-current ramp, then a differentiator, and a little math...

What's an easy way to plot the C-V curve of a back-biased diode? Maybe a constant-current ramp, then a differentiator, and a little math block? Or, flip that over, constant voltage ramp and current sensor, less math. Low level AC voltage on top of a DC sweep, and some sort of AC current detector? (Fake Boonton) -- John Larkin Highland Technology, Inc jlarkin a...

Is it possible to calculate the amplification factor for an amplifier,, e.g., a common emitter amplifier. This is because the amplification...

Is it possible to calculate the amplification factor for an amplifier,, e.g., a common emitter amplifier. This is because the amplification depends very much on the biasing condition, and so without a SPICE simulation, it appears impossible to determine the amplification factor. Am I right/wrong.

I'm looking at protecting a power sense circuit from mains power transients, using a resistor and a zener diode. Spice says it works well,...

I'm looking at protecting a power sense circuit from mains power transients, using a resistor and a zener diode. Spice says it works well, but when the zener conducts, essentially the entire transient voltage appears across the resistor. A high voltage transient spike is likely to be very narrow, but I can find nothing to say I can put, say, 5000V, across a 1K resistor, even for a micro...

Could some electronics guru here shed some light on this Could a single stage common collector amplifier exhibit amplitude modulation ? I have...

Could some electronics guru here shed some light on this Could a single stage common collector amplifier exhibit amplitude modulation ? I have the SPICE model of a simple common collector amplifier consisting of two base bias resistors, a collector resistor and an input and a output DC blocking capacitor, as well as a source and a load resistor of 50.0 Ohm. The BJT collector is connected to ...

We are seeking your comments/opinions on the following. We are creating a tool, plain ANSI C based, that will return the ladder LC model...

We are seeking your comments/opinions on the following. We are creating a tool, plain ANSI C based, that will return the ladder LC model filter coefficients for any input filter specification. The input specification would include e.g., for a low-pass 5th order Chebyschev filter with pass-band ripple of 0.2dB, cut-off frequency of 500 MHz, The output is in SPICE text based input ...

On Sat, 11 Sep 2010 09:44:13 -0700, Jim Thompson wrote: > On Sat, 11 Sep 2010 09:43:42 -0500, "Nik" > wrote: > > > After another...

On Sat, 11 Sep 2010 09:44:13 -0700, Jim Thompson wrote: > On Sat, 11 Sep 2010 09:43:42 -0500, "Nik" > wrote: > > > After another deep search, I found a Spice model of related 6n140 at... > > http://www.irtc-hq.com/pspicemodellibrary.html > > > > The sub-circuit uses a near-generic LED, two generic 2

Could some electronics guru here pleae help ? I want to simulate a double balanced diode mixer with a LO frequency of 50 MHz and RF frequency...

Could some electronics guru here pleae help ? I want to simulate a double balanced diode mixer with a LO frequency of 50 MHz and RF frequency of 100 MHz. Both LO and RF signal generators have a source resistance of 50.0 Ohms. The simplest Schottky diode model has a fixed resistance Rs, in series with a praallel Cj/Rj pair(junction capacitance/resistance). While Schottky diode SPICE mo...

Could some electronics guru please help ? I am running some SPICE simulations on wideband impedance matching of the following setup. The source...

Could some electronics guru please help ? I am running some SPICE simulations on wideband impedance matching of the following setup. The source and load resistances are equal The source is a pure resistor Yhe load consists of a resistor(same value as source resistor) and a series inductor The matching network is a 6th order low pass filter with a series inductor as the last element. Th...

See LM4040.zip on the Device Models & Subcircuits page of my website. This subcircuit models the whole TI LM4040 Precision Micropower...

See LM4040.zip on the Device Models & Subcircuits page of my website. This subcircuit models the whole TI LM4040 Precision Micropower Shunt Voltage Reference Family. Simply set parameter VZ to the desired reference voltage. ...Jim Thompson -- | James E.Thompson | mens | | Analog Innovations ...

I had never tried it in spice. I tried direct coupled first because I didn't really know what I was doing with the LTspice transmission line....

I had never tried it in spice. I tried direct coupled first because I didn't really know what I was doing with the LTspice transmission line. But this much seems to work just fine. It is very idealistic. I was checking some math with a circuit simulator. Version 4 SHEET 1 6120 3588 WIRE -240 -672 -320 -672 WIRE 432 -672 -240 -672 WIRE 800 -672 432 -672 WIRE 1056 -672 896 -672 WIRE 134...