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Soft-limiter circuit forms basis of simple AM modulator
Inserting diodes biased by reference voltages in the feedback loop of an op amp yields a soft limiter that you can use as the basis of an AM modulator. Details... more...
Nonvolatile digital potentiometer gates logic signal
A novel use for digital potentiometers employs them as a logic gate that functions as soon as the system powers up. Details... more...
TDR: taking the pulse of signal integrity
Time-domain reflectometry will help you design and troubleshoot cables, connectors, fast PCB traces, and high-speed packages. With TDR instruments, you can ensure the signal integrity of fast digital signals as they travel across your system. Both analog and digital engineers need to understand and use these techniques. Details... more...