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ISSUE DATE: MARCH 17, 1997 OPTIONS
HDL, Multimedia CPUs, 56-kbit/s and software modems, DSLs, High-speed digital designs

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March 17, 1997 - In This Issue

[Ideas For Design]
Constant power load needs only a few parts
Switching dc-dc converters are often used in portable or batterybacked projects because of their broad input voltage range and high efficiency. These converters present a constant-power load to the battery—their input current increases as the...  — Contributing Author

[Ideas For Design]
Single-supply microprocessor supervisor monitors bipolar rails
The circuit shown monitors both rails of a bipolar power supply with respect to user-defined threshold voltages (see the figure). It will produce a reset signal when either rail passes the associated reset...  — Contributing Author

[Ideas For Design]
Precision DC motor speed controller
Optical tachometers that produce a frequency proportional to RPM are popular feedback sources for precision analog motor speed control. This usually involves a frequency-to-voltage converter (FVC) to convert the tachometer output to a voltage that’s...  — W. Stephen Woodward

[Ideas For Design]
Dual-output voltage regulator converts 5V to 12V and 3.3V
Today’s microprocessors need a regulated 3.3-V supply that can provide several amperes of current. To obtain this, a synchronous switching regulator (LTC1266-3.3) using a 5-V supply is usually used with a p-channel top-side MOSFET and an n-channel...  — Contributing Author





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