Samuel Kerem holds a master's degree in biomedical electronics from Saint Petersburg Electrotechnical University, Russia. Email address: skerem@gmail.com
5 results found for Samuel Kerem, displaying items 1 - 5
December 11, 2008[Ideas For Design] Tame Switching Supply Noise While Maintaining Efficiency
A number of situations could benefit from the high efficiency of a switched power supply, save for the supply’s intrinsically high noise level. For example, an optical communications application using a large number of laser diodes could employ a switched power supply to avoid the need for heat-removal techniques. However, the laser diodes require a noiseless environment. A hasty decision to use a switcher would not be rewarding ...
September 25, 2008[Ideas For Design] Switched-Capacitor-Based Bandpass Filter Boasts (Nearly) Rectangular Shape
The filter described below is useful for detecting a signal that’s closely surrounded by spurs, even when the task is complicated by the frequency of the signal of interest wandering by a few percent. For example, in telecom, a pilot signal can originate from sources scattered around the world. Assume a 10.0-kHz signal of choice. Due to variations in oscillators, temperature conditions, and aging, a frequency deviation of ±200 Hz can be...
July 24, 2008[Ideas For Design] Add On-Board Power Measurement Capability To Telecom Equipment
This idea shows how to monitor input voltage and current consumption for telecommunications equipment powered by two independent feeds: -48 V (A) and -48 V (B). Each feed supplies at least -42.5 V to -56.5 V, and for redundancy the feeds are ORed on the module. For maintenance and support purposes, it’s important to monitor input voltage, the feeds’ presence, and the module’s power consumption. ...
March 6, 2000[Ideas For Design] Comparator Features Symmetrical Thresholds
The comparator often is the simplest bridge between analog and digital worlds, but crossing this bridge isn't as simple as might be thought. Keep in mind, we are leaving the analog world with an indefinite number of states and entering into a vastly...
