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Capacitor Model - Ideal capacitors exist only in textbooks, not on
real circuit boards. You may be surprised to find that all practical
capacitors look (behave) similarly to the series RLC network shown above.
Whether you're designing a filter or picking bypass capacitors, you'll
need....(spice design added 02/09) |
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Care, Handling & Solder Profile for Diodes - MicoNote 05 from
Microsemi....[App Note] |
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Circuit Protects FPGAs from killer SPICEs - 04/23/98 EDN-Design
Ideas....A project using Xilinx FPGAs brought an interesting problem to
light. When you turn on the board, one FPGA in three succumbs to this
problem. A lot of frustration and testing uncovered a negative-going spike
(Figure 1]in the 5V line from the dc/dc converter. The system uses a dc/dc
converter....File contains many circuits, scroll to find this one....
[Design Idea by Nelson Nguyen, Anritsu Corp, Morgan Hill, CA] |
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Common Emitter Transistor Amplifier - Here’s a classic circuit
that’s still an essential building block of circuits today, both IC and
discrete....(spice design added 02/09) |
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Common-Mode Rejection - While real op amps do a fantastic job of rejecting
voltages common to both inputs, it's not perfect. A small output results from a change
in input common-mode voltage. What causes this output? Due to mismatching in the
transistors and resistors of the input stage, the common-mode voltage produces a small
differential error voltage at the input terminals. Subsequently....(spice design added
02/09) |
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Compare SPICE simulation to graphical template - 11/23/95 EDN-Design
Ideas.... EDN is migrating links. This link is not verified. Search the "title"
+ "EDN" for new link. |
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Component Tolerances-Part I - ....(spice design added 02/09) |
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Component Tolerances-Part II - ....(spice design added 02/09) |
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Current Source - Getting optimum performance in certain applications
requires that some components, sensors, DC motors, transistors, be driven or biased by
a constant current. We're mostly familiar with voltage regulators and their ability to
maintain a constant voltage under varying current conditions. In this application,
your challenge is to provide a constant....(spice design added 02/09) |
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DC Motor Model - Although SPICE does not provide explicit models for
electro-mechanical devices, like a DC motor, creating one is fairly straightforward.
You just need to remember that most physical behaviors, whether mechanical or
electrical, can be described by a set of equations. So for a desired....(spice design
added 02/09) |
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Delay Line Aids in One-shot Simulations - 02/05/04 EDN-Design Ideas....In
low-noise analog circuits, a high-gain amplifier serves at the input to increase the
SNR. The input signal level determines the input-stage gain; low-level signals require
the highest gain. It is also standard practice in low-noise analog-signal processing
to make the circuit's bandwidth as narrow as possible to pass only the useful
input-signal spectrum. (added 10/05] EDN is migrating links. This link is not
verified. Search the "title" + "EDN" for new link. |
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Delay Line Eases SPICE Dead Time Generation - 02/05/04 EDN-Design
Ideas....In low-noise analog circuits, a high-gain amplifier serves at the input to
increase the SNR. The input signal level determines the input-stage gain; low-level
signals require the highest gain. It is also standard practice in EDN is
migrating links. This link is not verified. Google the "title" EDN for new link.
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Development of an Extensive SPICE Macromodel for 'Current-Feedback' Amplifiers -
National Semiconductor Application Note (app note added 2/06) |
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Diff Amp with Current Mirror - In an audio input differential stage, you
often see the simple collector resistor replaced with a current mirror. Why bother?
The payoff is two fold. First, you get twice the gain and current output, typically a
good thing for an audio amp. And second....(spice design added 02/09) |
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Differential Amplifier - ....(spice design added 02/09) |
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Differential to Differential - ....(spice design added 02/09) |
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Differential to Single-Ended - ....(spice design added 02/09) |
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Differentiator - ....(spice design added 02/09) |
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Digital Filter Makes Simple SPICE Eliminator - 04/10/97 EDN-Design
Ideas....As an alternative to counter- and shift-register-based techniques, you can
use a digital filter to eliminate spikes from a signal (Figure 1a]. This scheme,
which feeds the signal into a digital lowpass filter whose output drives a trigger
with hysteresis, can filter short pulses.... [Design Idea by Francois Corthay Dr Sc,
Engineering School Wallis, Switzerland] |
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Driving a Capacitive Load - You've been warned! Do not attempt to drive
large capacitances with your op amp, severe overshoot and ringing may occur. But what
if you're stuck driving a length of coax cable that's unterminated? You could end up
with over 1000 pF that sends the output ringing. What causes this behavior?
Unfortunately....(spice design added 02/09) |
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