Spectrum Software
Industrial Strength Simulation




Spectrum Software has released Micro-Cap 11, the eleventh generation of our SPICE circuit simulator.

For users of previous Micro-Cap versions, check out the new features available in the latest version. For those of you who are new to Micro-Cap, take our features tour to see what Micro-Cap has to offer.







Where TMC really shines: a novel transimpedance stage (TIS) - Edmond P. Verrijn Stuart, Data Odyssey
Linear amplifier design using two pole (Miller) compensation

Use of the Hefner IGBT model in high power applications.

IBIS Output Impedance Made Easy - Bert Simonovich, Lamsim Enterprises
The methodology presented here is a simple and effective way to predict the driver’s output impedance from an IBIS model.

Sound sensor for digital application - YouSpice project
Shows how to interface an analog signal from a microphone to a digital board TTL/CMOS. This could be a sound sensor board for a robot system.

Sound detector sensor - YouSpice project
A two stage BJT sound detector with an adjustable threshold. When a sound is detected, a third BJT is activated and a LED is turned on.

A New Zobel Network for Audio. - Ben Duncan Research - UK & Russ Andrews Accessories Ltd
A new class of Zobel network has recently been developed for assisting in RF & EMI suppression and spike risetime reduction, and overall offers consequent noise-floor reduction in the audio circuits associated with the device. A commercial realisation dedicated to mainly dealing with amplifier-to-speaker connections is named Zapperator.

SPICE Modeling of Memristive, Memcapacitative and Meminductive Systems. - Biolek, D., Biolek, Z., Biolkova, V. Proc. of ECCTD '09, European Conference on Circuit Theory and Design, August 23-27, 2009, Antalya, Turkey, pp. 249-252. ISBN 978-1-4244-3896-9.
A methodology of SPICE modeling of general memristive, memcapacitative, and meminductive systems is proposed and their special cases such as memristors (MR), memcapacitors (MC), and meminductors (ML) are given. These elements are included alongside the conventional R, C, and L elements in a proposed constellation, which generalizes the hitherto approach when the memristor is regarded as a fourth missing passive element. It is shown that the memristor, designed in HP laboratories, can be modeled as a first-order memristive system with nonlinear dependence of the time derivative of the state variable on this variable and on the current flowing through. The outputs of SPICE analyses are consistent with the hitherto published results.

Simulation, Analysis and Comparison of SET And CMOS Hybrid Circuits Using SPICE Model. - G.V.Hari Prasad, Dr.P.Rajesh kumar, V.srinivasa Rao, K.Leela Bhavani, Department Of Electronics & Communication Engineering, Shri Vishnu Engineering College For Women,JNTU Kakinada University
A tunneling transistor is considered to be an element of a future low power, high-density integrated circuit because of a possible ultra-low power operation with a few electrons. In this context, the performance of SET is compared qualitatively and quantitatively with CMOS logic gates. Therefore, although a complete replacement of CMOS by single-electronics is unlikely in the near future, it is also true that combining SET and CMOS one can bring out new functionalities, which are un- mirrored in pure CMOS technology. As the hybridization of CMOS and SET is gaining popularity, silicon SETs are appearing to be more promising than metallic SETs for their possible integration with CMOS Simulation of SET and CMOS circuits are required for efficient circuit design and analysis. The macro-modeling technique of SET has been applied to the SPICE simulation of single-electron/CMOS hybrid circuits.

Interference & Distortion Reducing Capabilities of Woven PowerKords™ - Ben Duncan
The scope of this paper is to demonstrate the mechanisms of distortion and noise being reduced, hence greater fidelity, when using woven cables to connect AC power to hi-fi equipment. In so doing, a unique feature of woven cables is identified and christened, as The Glissando effect.

SPICE model of memristor with nonlinear dopant drift. - Biolek, Z., Biolek, D., Biolkova, V. Radioengineering, vol. 18, no. 2, June 2009, pp. 210-214.
A mathematical model of the prototype of a memristor, manufactured in 2008 in Hewlett-Packard Labs, is described in the paper. It is shown that the hitherto published approaches to the modeling of boundary conditions need not conform with the requirements for the behavior of a practical circuit element. The described SPICE model of the memristor is thus constructed as an open model, enabling additional modifications of non-linear boundary conditions. Its functionality is illustrated on computer simulations.

AC Analysis of Idealized Switched-Capacitor Circuits in Spice-Compatible Programs. - Biolek, D., Biolkova, V., Kolka, Z. CSCC07, The 11th WSEAS Int. Conf. on Circuits, Crete, 2007, pp. 222-226.
Direct AC analysis of idealized switched-capacitor circuits in Spice-compatible programs is described in the paper. The capacitor is described by a special macro-circuit, whose mathematical model is based on modified zdomain charge equations and on the theory of equivalent signals.

Analysis of digital filters via SPICE-family programs - Prof. Dalibor Biolek
The paper describes an unusual approach of employing the SPICE-family circuit simulation programs in a simple analysis of digital filters.

Modeling 1/f Noise in HEMTS with SPICE-Based Micro-Cap - Donna Kubik
Micro-Cap was used to model HEMTs, with special attention paid to 1/f noise.

Electronic filters design tutorial - Angelo Boni
The paper provides a tutorial on the design of electronic filters such as bandpass, low pass, high pass, and notch filters.

The noise macromodel of an optocoupler including 1/f noise source - B. Stawarz-Graczyk, J. Cichosz and A. Konczakowska, Bulletin of the Polish Academy of Sciences Technical Sciences Vol. 56, No. 1, 2008
The course of design of an optocoupler’s PSpice macromodel including noise sources is described. The PSpice macromodel is proposed for the low frequency range. The PSpice model of a MOSFET transistor was applied as the noise source type 1/f in an optocoupler PSpice macromodel. In the enhanced macromodel the value of the noise exponent can be changed in the range of 0.8–1.25.

SPICE Analysis of Crystal Oscillators - Michael R. Monett
This paper describes a simple method of starting a high-Q crystal oscillator at full amplitude, where it quickly settles into steady-state operation. The new method can provide high resolution waveforms over 4,000 times faster than before.

MC4046 Frequency/Phase Detector Offset
This paper describes the frequency/phase detector in the Motorola MC4046 device.

Usare Micro Cap 9 - Giovanni Schgör
(Italian) This paper provides a tutorial on how to use Micro-Cap with corresponding examples.

A SPICE Model and Electrostatic Field Analysis of the MOS Turn-Off Thyristor - D.Q. Kelly, D.J. Mayhall, M.J. Wilson, D.A. Lahowe
This paper presents a circuit model and an electrostatic field analysis with an approximate model of the SDM170HK MOS turn-off thyristor (MTO) fabricated by Silicon Power Corporation.

Get more power with a boosted triode - Dave Cuthbert
This paper describes a method to increase the audio power of an amplifier by using a boosted triode.

A wideband LNA using the BFG520 for satellite receivers - H. Maas
This paper presents an example of a wideband Low Noise Amplifier (LNA) with the 9GHz BFG520/X wideband transistor.

Electrical frequency compensation circuit response effects simulated in Microcap software. - John Ridley
This paper presents the electrical frequency compensation circuit response for the Tannoy Monitor Red and Monitor Gold.

Micro-Cap Simulation - Ian R Scott
The VCO (will) show a 3.7 MHz VCO with output power, harmonic content and spectral phase noise.
The RF PA will show a 10 Watt Peak Envelop Power (PEP) amplifier operating at 3.7 MHz with a two tone stimulus applied and showing Intermodulation sideband products.

Stereo Multiplexing for Dummies - Web Surf
This paper describes how to generate the Stereo Multiplex signal.

BJT Amplifier Sample Lab Report - University of Maine
The design and test of a common-emitter BJT amplifier is described.

Micro-Cap 10, simulatore analogico/digitale
(Italian) This page provides a quick review of MC10 in Italian.