January 12, 1998 Magazine Archive

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ISSUE DATE: JANUARY 12, 1998

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Technology Forecast: IP, Portable by Design/Wireless Symposium Preview, Lead-acid batteries, USB

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Browse Archived Articles By: Issue | Author | Department | Topic

January 12, 1998 - In This Issue

[Ideas For Design]
Program gives asymmetrical Spice tolerance
Spice is unable to accommodate asymmetric tolerances for worstcase analysis. However, the DISTRIBUTION statement available in Monte Carlo analysis can accommodate asymmetric tolerances by creating histogram bins. Asymmetric tolerances can easily occur... — Contributing Author

[Ideas For Design]
Robust, low-cost continuous phase FSK modulator
In bandpass data transmission, one common way to design low-cost frequency-shift-keying (FSK) analog modulators is to use two independent oscillators that have outputs switched according to the binary input wave to be modulated. While this approach is... — Contributing Author

[Ideas For Design]
Software linearization techniques for thermistors
Interfacing an NTC thermistor to a computerized data-acquisition system requires a resistance-to-voltage (or current) converter (bridge, voltage divider, etc.). It’s also necessary to incorporate software routines to convert the ADC units of the... — Contributing Author

[Ideas For Design]
Measure light intensity with an 8-bit microcontroller
Light sensors find their way into a host of interesting applications. For instance, a light sensor in a camera measures the amount of light that the film will be exposed to. Once the amount of light is known, the proper lens aperture can be calculated... — Contributing Author

[Ideas For Design]
Inexpensive "power ok" signal for the PC
It’s often handy to have an LED indicate “Power OK” status in electronic equipment. Single-supply designs need only a resistor and an LED to perform this function. A personal computer, on the other hand, has four supply voltages (+5 V,... — Contributing Author

[Ideas For Design]
Multiplex A/D inputs without software
The circuit described here uses hardware instead of software routines and multiple I/O ports to select multiplexer channels in a data-acquisition system. It features an 800-ksample/s 14-bit ADC (U1), which receives and converts signals from an... — Contributing Author

[Pease Porridge]
What's all this breadboarding stuff, anyhow?
After I sent out a brief note, confirming that we rarely see anything written down about how to do breadboarding, the letters and e-mail started coming. This e-mail's from Graeme Nisbet... — Bob Pease

[Walt Jung Archive: Walt's Tools And Tips]
Anniversary Time: Looking Back To Beginnings
This month's column date marks a couple of milestones in my publishing history. First of all, it is the first anniversary of this column's startup. Over the last year, we've seen 13 serial columns, composed of both short monthly types as well as two... — Walt Jung

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