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2nd Gain Stage - Unfortunately, for particular combinations of
slew-rate, first-pole frequency and open-loop gains, the Intermediate Op Amp
Model just can't handle it. The spreadsheet coughs up a negative number for
RE1 and RE2 making it impractical. So what's....(spice design added 02/09)
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A SPICE Compatible Macromodel for CMOS Operational Amplifiers -
National Semiconductor Application Note (app note added 2/06)
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A SPICE Op Amp Macromodel for the LT1012 - DN28 Design Notes
(Linear Technology) (app note added 1/06) |
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Active Load in Gain Stage - Instead of a resistor at the
transistor's collector, you might have seen a current source (active
component) substituted in an audio amp's gain stage. Why go through the
trouble of the added components? You'll find the active loading of a current
source packs....(spice design added 02/09) |
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Advanced Audio Amplifier - This is roughly the minimum number of
components that represents the classic audio amplifier topology. You can
clearly see the three stages found in many audio amps (and op amps
today).....(spice design added 02/09) |
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Algorithm Overview - Regardless if you have a great or small interest in
understanding how SPICE works, its a good idea to get a basic grasp of it. Why? For
the same reason it helps to have basic understanding of how your car works, when
things go wrong....(spice design added 02/09) |
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AM Modulator - This circuit uses two signal generators to simulate an
Amplitude Modulated RF carrier wave. The output can be used to simulate the response
of LC and tank circuits….(spice design added 08/05) |
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An LT1013 & LT1014 Op Amp SPICE Macromodel - DN12 Design Notes (Linear
Technology) (app note added 1/06) |
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An OrCAD PSPICE Library for the VIP10 High-Speed Op Amp - National
Semiconductor Application Note (app note added 2/06) |
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AN-117: OP-42 Advanced SPICE Macro-Model - AN-117 Analog Devices Application
Notes....[App Note] |
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AN-120: OP400 SPICE Macro-Model - AN-120 Analog Devices Application
Notes....[App Note] |
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AN-1255: An OrCAD PSPICE Library for the VIP10 High-Speed Op Amp - National
Semiconductor Application Note (app note added 2/06) |
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AN-132: OP470 SPICE Macro-Model - AN-132 Analog Devices Application
Notes....[App Note] |
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AN-138: SPICE-Compatible Op Amp Macro-Models - AN-138 Analog Devices
Application Notes....[App Note] |
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AN23 Zetex SPICE Models: Understanding Model Parameters & Applications Limitations
- Zetec Semiconductors Applications NotesThis report describes basic
Gummel-Poon model as used as a basis for analog circuit simulations. An overview of
model parameters and ir derivation, as well as guidelines for model manipulation for
specific cases are also included. A number of typical application circuits are
suggested with resultant SPICE predictions of operation. (app note
added 2/06) |
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AN-840: Development of an Extensive SPICE Macromodel for 'Current-Feedback' Amplifiers
- National Semiconductor Application Note (app note added 2/06)
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AN-856: A SPICE Compatible Macromodel for CMOS Operational Amplifiers -
National Semiconductor Application Note (app note added 2/06) |
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Analog Behavioral Modeling - In the good old days, to model a simple LOG
function, you reached for a diode from the SPICE tool shed and embarked on
synthesizing the log function. More complex functions snared you deeper into math and
device theory. You spent more time developing and debugging the math
function....(spice design added 02/09) |
| Analyze LED characteristics with PSPICE -
01/18/01 EDN-Design Ideas....Recent advances in LED technology have lead to LEDs'
widespread use in outdoor-signal applications, such as in traffic and railroad
signals. A typical LED signal consists of an LED array and a power supply. When a
low-voltage power supply is eir desirable or mandatory, series/parallel combinations
of LEDs become inevitable.... [Design Idea by Sam Mollet, GE Harris Harmon Railway
Technology, Grain Valley, MO] |
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Apex-AN33 Spice Model & PWM Amplifier Applications - 6/2007, AN33UREVB :
435 Kb (Apex App Note added 08/08/08) |
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Audio Tone Controls - Many people at one time or other, regardless of their
interest in electronics, have adjusted these controls to suit their preference.
Whether its to boost the bass of their favorite CD, cut the noise / static on a talk
radio station or compensate for poor loud speaker response, they've reached for the
treble and bass tone controls. The ni....(circuit diagram added 02/09) |
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Basic Audio Amplifier - ....(spice design added 02/09) |
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Basic Digital Gates - You're simulating a circuit, it requires several
digital gates, but you don't have a mixed-mode simulator. What to do? One solution
involves creating simplified versions of the logic functions. To do this, we look to
the NMOS transistor implementation of logic gates where the transistor acts like a
voltage-controlled switch. But, instead of the transistor, we'll use the SPICE
switch....(design added 02/09) |
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Basic Op Amp Model - One of the challenges of simulating opamp circuits is
modeling the op amp itself. How is that accomplished? There's a couple of ways. You
can create a circuit of many transistors, resistors and caps that closely replicate
the internals of an op amp....(spice design added 02/09) |
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Behavioral SPICE-model emulates VCO - 07/06/95 EDN-Design Ideas....A
behavioral model treats a circuit as a black box, which you can describe using an
equation or table. Listing 1 is a Microsim PSpice behavioral model that simulates the
operation of a voltage-controlled oscillator (VCO]. The output signal of a VCO is
VO=Aβsin(2ăfOt], where A is the amplitude, t is the time variable.... [Design
Idea by Dr Bashir Al-Hashimi, Staffordshire University, Stafford, UK] |
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BJT Current Source - ....(spice design added 02/09) |
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Buck Converter-AC Model - We've already developed a SPICE model for the Buck
Converter in a voltage control loop. The controller performed brilliantly holding the
output steady under varying load conditions. However, closing the loop is fraught with
danger! Without proper insight, Vo can start ringing and oscillating out of
control....(spice design added 02/09) |
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