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SPICE Designs, Page 1
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Last Updated on:
Thursday, April 07, 2016 01:00 PM

Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:
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)
A SPICE Compatible Macromodel for CMOS Operational Amplifiers -  National Semiconductor Application Note  (App Note - added 2/06)
A SPICE Op Amp Macromodel for the LT1012 -  DN28  Design Notes (Linear Technology) (App Note - added 1/06)
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)
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)

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)
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)

An LT1013 & LT1014 Op Amp SPICE Macromodel -  DN12  Design Notes (Linear Technology) (App Note - added 1/06)
An OrCAD PSPICE Library for the VIP10 High-Speed Op Amp -  National Semiconductor Application Note  (App Note - added 2/06)
AN-117: OP-42 Advanced SPICE Macro-Model -  AN-117 Analog Devices Application Notes....[App Note - ]
AN-120: OP400 SPICE Macro-Model -  AN-120 Analog Devices Application Notes....[App Note - ]
AN-1255: An OrCAD PSPICE Library for the VIP10 High-Speed Op Amp -  National Semiconductor Application Note  (App Note - added 2/06)
AN-132: OP470 SPICE Macro-Model -  AN-132 Analog Devices Application Notes....[App Note - ]
AN-138: SPICE-Compatible Op Amp Macro-Models -  AN-138 Analog Devices Application Notes....[App Note - ]
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)
AN-840: Development of an Extensive SPICE Macromodel for 'Current-Feedback' Amplifiers -  National Semiconductor Application Note  (App Note - added 2/06)
AN-856: A SPICE Compatible Macromodel for CMOS Operational Amplifiers -  National Semiconductor Application Note  (App Note - added 2/06)
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]
Apex-AN33 Spice Model & PWM Amplifier Applications -  6/2007, AN33UREVB : 435 Kb (Apex App Note - added 08/08/08)
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)
Basic Audio Amplifier -  ....(spice design added 02/09)
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)
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)
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]
BJT Current Source -  ....(spice design added 02/09)
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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