Spice Does Digital Filter - 09/29/94 EDN Design Ideas: You can use Spice to simulate digital or discrete time filters as well as analog or continuous time filters. Just as you would use integrator blocks to simulate the 1/s terms for an analog filter, you can use Spice's transmission-line component to simulate the ideal z-1 delay elements of digital filters __ Circuit Design by Richard J/ Faehnrich, Bio-Imaging Research, Linconshire, IL Spice Filters Allow Experimenting Without Designing Actuals - 11/10/94 EDN Design Ideas: This ZiPfile attached to EDN BBS /Di_SiG #1620 contains some popular filters you can use with Spice models. Specified in terms of frequency and damping factor, the filter models allow you to experiment without having to design working filters __ Circuit Design by George Ellis, Kollmorgen, Radford, VA
Spice generates PSK & FSK signals - EDN Design Ideas: March 26, 1998 [ NOTE: FILE has multiple design, scroll for this one.] Creating generators for amplitude-, frequency-, and phase-modulated signals can greatly simplify communication-system simulation. Although Spice includes a basic set of waveform generators, it includes no built-in support for many types of signals. __ Circuit Design by Debra Horvitz, Galahad Systems, Laguna Hills, CA
Spice introduces Dead time in simulations - 08/01/98 EDN Design Ideas: (FILE has several circuit ideas. Scroll to find this one.) Bridge or half-bridge designs using MOSFETs or insulated-gate bipolar transistors need some dead time between commutations to avoid any cross-conduction current spikes. This statement is also valid for switch-mode power supplies that use synchronous rectification. In creating simulations, it is sometimes difficult to write the stimulI so as to define a dead time between commutations. __ Circuit Design by Christophe Basso, Motorola Semiconductor, Toulouse, France
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 (2ãfOt], where A is the amplitude, t is the time variable __ Circuit Design by Dr Bashir Al-Hashimi, Staffordshire University, Stafford, UK
Spice Model makes it easy to Design with PWM Amplifier - EDN-Design ideas--08/17/ 98 Spice model makes it easy to design with PWM amplifiersHigh-efficiency PWM amplifiers are displacing linear designs in many applications. You can design a constant-current or a constant-voltage PWM amplifier with the aid of a simple yet versatile Spice model.Yu Jen Wong, Apex Microtechnology Corp The recent availability of high-voltage and high-current PWM amplifiers in hybrid packages has attracted the interest of many designers who traditionally use linear amplifiers. The advantage of PWM amplifiers is obvious: efficiency of 70 to 97%. High efficiency translates to lower internal power loss, smaller heat sinks, and reduced overall physical size. __ Circuit Design by Yu Jen Wong is an application engineer at Apex Microtechnology Corp
Spice Model mimICs realistic current source - EDN Design ideas - 03/03/1994 Using an ideal Spice current source often results in significant simulation errors, particularly for circuits that include fixed-current loads and constant-current sources. When using a current source as a load, for example, the ideal source in Spice produces whatever voltage is required (positive or negative) to produce the specified current, even if the circuit doesn't have power or its output is off. A load resistor is the safest alternative for a circuit load, but you'll often have to perform several iterations (and put up with a fair amount of aggravation) to adjust the load resistor so that the simulation produces the exact desired value of load current. __ Circuit Design by Ray Kendall,USBI, Huntsville, AL
Spice Model Simulates Broadband Transformer - 05/11/95 EDN Design Ideas: The approximate model in Fig 1 makes it easier to include high-frequency transformers in a Spice simulation. Broadband pulse transformers are widely used to transform impedance levels as a noise-reduction or source-matching technique. Fig 1 includes the physical model and the key performance equations. The model shows the transforme __ Circuit Design by Author Not Listed
Spice Model simulates laser diode - 07/16/98 EDN Design Ideas: When you design drive circuitry for laser diodes, you must consider safety measures. Laser diodes are delicate devices, and excessive reverse voltage or forward current can easily destroy them. Usually, a laser-diode driver circuit comprises the laser diode and a monitor photodetector FILE has several circuits, please scroll to find this one __ Circuit Design by Lukasz Sliwczynski, University of Mining and Metallurgy, Krakow, Poland
Spice Model simulates spark-gap arrestor - 07/03/97 EDN Design Ideas: Spark-gap arrestors, or surge arrestors, are highly nonlinear devices whose function is to block transient surges on dc or ac power-supply lines. Such transients can arise from lightning strikes, motor starts, and other causes. A spark gap uses two electrodes that oppose each other across a short distance in an atmosphere of inert gas, such as neon or argon. If the voltage on the arrestor is below its striking voltage (avalanche potential) , the current in the arrestor is close to zero. __ Circuit Design by Christophe Basso, Sinard, France
Spice Models CMOS Switch - 02/17/94 EDN Design Ideas: The Spice subcircuit in Listing 1 is a model of an spst CMOS analog switch. Ideal circuit elements such as PMOS and NMOS FETs model the switch (M3 and M4) and the switch's CMOS inverters (M1 and M2). Resistors and capacitors model the CMOS switch's drain-to-source on-resistance (RDS) , The Spice subcircuit in Listing 1 is a model __ Circuit Design by Paul E/ Brown Jr, McDonnell Douglas, Santa Anna, CA
Spice Models differential stripline - 10/12/00 EDN Design Ideas: Differential signaling is a common technique for obtaining high noise immunity for critical signals in high-speed digital pcboard systems. The pc board’s traces, carrying differential signals, are often edgecoupled offset striplines, withPDF contains many designs. Please scroll to find this one __ Circuit Design by Vittorio Ricchiuti, Siemens ICN, L’Aquila, Italy
Spice Models Power MOSFETs - EDN Design ideas - 03/02/1995 The Spice macromodel in Fig 1 accurately simulates double-diffused (DMOS) power-MOSFET transistors. Although you can easily get Spice models for just about any op amp, power-MOSFET Spice models are virtually nonexistent. __ Circuit Design by Richard K Williams, Iraj Masarrati, and Ajay Butani, Siliconix Inc, Santa Clara, CA
SPICE Op Amp Macromodel for the LT1012 - DN28 Design Notes__ Linear Technology/Analog Devices
Spice Plots Noise Figure - 06/09/94 EDN Design Ideas: The waveform-manipulation capabilities of modern Spice-based simulators, such as MicroSim Corp's PSpice, make it easy to plot complex functions, such as noise figure. The traditional definition of "noise figure" is "the amount of signal-to-noise degradation a circuit causes. " Another definition is "the total-output-noise power divided by the output-noise power due to the source impedance, __ Circuit Design by Michael A Wyatt , SSAVD Honeywell Inc, Clearwater, FL
SPICE Power Meter - (spice design) __ Designed by Rick
SPICE Predicts Differential Conducted EMI from Switching Power Supplies - 02/03/97 EDN-Design Feature Spice not only can predict the exact EMI levels produced by a switched-mode power supply, but also can produce plots that allow you to easily evaluate your design and the effectiveness of the EMI filter. __ Circuit Design by Design Feature by Christophe Basso, Sinard, France
Spice Provides Z-Domain Simulation - 04/11/96 EDN Design Ideas: Commercial Spice simulators, such as MicroSim's PSpice, simulate circuits using analog behavioral modeling (ABM) , in which you model a circuit as a black box. The circuit's description takes the form of a mathematical function or an s-domain transfer function. Reference 1 gives examples of developing LaPlace-function models of analog filters. Unfortunately, PSpice ABM does not directly support the simulation of z-domain transfer functions. These functions describe discrete-time system operations, such as those used in switched-capacitor and digital filters. A method shown here uses the LaPlace function of ABM to achieve z-domain simulation. __ Circuit Design by B Al-Hashimi and M Moniri, Staffordshire University, Stafford, UK
Spice Runs Thermal Analysis - 08/18/94 EDN Design Ideas: Performing a thermal analysis in Spice allows you to study a circuit's electrical performance and the accompanying thermal effects simultaneously. For example, a Spice simulation that includes thermal analysis allows you to study the effects of reactive loads on amplifier dissipation or driver waveforms on power-supply switching-transistor dissipation and even secondary breakdown prediction. Spice maintains accurate results in temperature regions where the dominant method of heat transfer is by conduction and convection, where most electronic systems operate. __ Circuit Design by Michael Wyatt, Honeywell Inc, Clearwater, FL
Spice simulates a fluorescent lamp - 11/06/97 EDN Design Ideas: A hot-cathode fluorescent lamp (HCFL]contains a gaseous mixture that flows between two tungsten electrodes, or filaments. In domestic applications, the mixture comprises mercury vapor and a small quantity of inert gas (krypton or argon]. The inert gas vaporizes the mercury during turn-on __ Circuit Design by Christophe Basso, Pibrac, France
Spice simulates potentiometer - EDN Design ideas - 03/27/1997 Spice and its derivatives are useful tools for simulating the performance of electrical and mechanical circuits. Most versions of Spice can simulate voltage sources, current sources, and voltage- and current-controlled voltage and current sources, as well as can sweep model parameters, which in turn sweep component values as well as voltages or currents. __ Circuit Design by Stanley Shell and Sopheap Heng, University of California--Los Angeles, and Tim Christensen, Microsim Corp, Irvine, CA
Spice Simulators Provide Behavioral Sources to Mere Mortals - 4-Feb-10 EDN Design Ideas: Use behavioral models to simulate circuit elements __ Circuit Design by William H Morong, Paoli, PA
Spice subcircuit Models Thermistors - 07/03/97 EDN Design Ideas: The subcircuit in Figure 1 is a simple and efficient behavioral model for a thermistor, implemented in PSpice (Microsim, Irvine, CA). The model simulates realistic thermistor parameters for all standard analyses (transient, ac, and dc). You can set all relevant thermistor parameters--nominal resistance, nominal and ambient temperatures, and material and thermal constants--during the call of the subcircuit. __ Circuit Design by Lutz Wangenheim, Hochschule, Bremen, Germany
Spice Subcircuit Simulates Any Second-Order Filter - 01/06/94 EDN Design Ideas: The Spice subcircuit filter in Listing 1, along with the appropriate constants drawn from Table 1, simulates any second-order filter. The subcircuit in the Listing runs under MicroSim's (Irvine, CA] pSpice. To calculate the parameters that the subcircuit needs, begin with the classical transfer function for a filter. __ Circuit Design by Horace T Jones, Rockville, MD
Summing Amplifier - The summing amplifier is a handy circuit enabling you to add several signals together. What are some examples? if you're measuring temperature, you can add a negative offset to make the display read "0" at the freezing point. On a precision amplifier, you may need to add (spice design) __
Supply Correction Current - (spice design) __ Designed by Rick
Switched-Capacitor Integrator - We can strap this circuit onto the front end of an OpAmp to create the basic building block of many filter circuits the integrator. However, the major obstacle to happy filtering is the mine field of stray capacitance. These uncontrolled strays can add significant capacitance to the switched capacitor, destroying the accuracy of your desired filter __ Designed by Rick
Switched-Capacitor Resistor - (spice design) __ Linear Technology/Analog Devices Magazine • February 1999 Jeff Witt |