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Circuit Techniques for Avoiding Oscillations in Comparator Applications: National Semiconductor Application Note (app note added 2/06) |
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Comparator Adds Current Limit to V2 Controller: 05/21/98 EDN-Design Ideas / (added 11/05) The subroutine "FASTBCD"
(Listing 1) for 8051 µPs quickly converts 16-bit binary to 24-bit BCD data. The conversion algorithm involves left-shifting bits from the high-order bit of the binary number into the carry bit
while left-shifting the carry bits into the low-order bit of a BCD shift register using BCD left-shift operations. .... |
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Comparator Detects Failed Telecomm Supplies: 06/22/00 EDN-Design Ideas / (added 5/03) /Detects when telecomm power supplys48V output drops below its nominal value, uses an isolated
comparator to monitor two48V telecomm supplies (of either polarity) / PDF contains multiple circuits scroll to find the one of interest |
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Comparator Exhibits Temporary Hysteresis: 10/14/00 EDN Design Ideas / (added 5/05) |
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Comparator has Independent Trip Voltages: 07/22/99 EDN Design Ideas / (added 11/05) |
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Comparator has Programmable Limits: 07/08/99 EDN Design Ideas / (added 11/05) [Note: File contains multiple circuits.
Scroll to find this one.] The circuit in Figure 1 combines a dual buffered D/A converter and dual four-input comparator to configure a comparator circuit .... |
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Comparator Improves Regulator's Efficiency: 04/28/94 EDN-Design Ideas / (added 5/03) The UC384X family of current-mode PWM
regulators requires a current shunt or some other component to develop a voltage proportional to the output current. This shunt must develop a 1V signal at full load. For off-line
supplies, the 1V requirement is not hard to meet because of the high voltage on the supply's dc bus. However, if you want to use a UC384X regulator in a low-voltage circuit, the 1V drop
becomes undesirable. Lowering the shunt's value is not a good idea because the maximum current would rise to an unacceptable value in short-circuit or overload conditions. The
circuit in Fig 1 shows an 11W current-mode flyback converter..... |
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Comparator Provides Stable Hysteresis: 03/18/99 EDN-Design Ideas / (added 5/03) Unless a voltage-comparator circuitis
sampling an extremely clean signal, the comparator always requires some hysteresis. Traditional comparator circuits obtain the required hysteresis by using positive feedback derived from the
ratio of two resistors. The voltage at the noninverting input is the superposition.... |
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Comparator uses Signal Dependent Hysteresis: 03/26/98 EDN-Design Ideas / (added 03/03) A project posed the challenge of
replacing existing analog potentiometers (used to set brightness and contrast levels) in video monitors with digitally controlled potentiometers. The different brands and models of monitors
presented widely varying voltages across the potentiometers.... |
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Comparators Form 3 to 5 Volt or 5 to 3 Volt Translator/Tranceiver: 09/02/96 EDN-Design Ideas / (added 3/03) In many recent
systems, you often need to interface 3V signals with higher voltages within the system. In some cases, it's necessary to interconnect 3 and 5V open-collector transceivers.Figure 1 shows one
example, in which multiple multidrop communications devices interconnect. In systems where no control lines are available for interfacing, the translating transceiver must control |
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Comparing the High Speed Comparators: National Semiconductor Application Note (app note added 2/06) |
