|
AN-41: Precision IC Comparator Runs from +5V Logic Supply: National
Semiconductor Application Note (app note added 2/06) |
|
AN-87: Comparing the High Speed Comparators: National Semiconductor
Application Note (app note added 2/06) |
|
Applications of the LM392 Comparator Opamp Ic: National Semiconductor
Application Note 04-Nov-1995 (app note added 4/02) |
|
Circuit Techniques for Avoiding Oscillations in Comparator Applications:
National Semiconductor Application Note (app note added 2/06) |
|
Comparator Provides Stable Hysteresis: 03/18/99 EDN-Design Ideas / (added
7/03) 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.... |
|
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.... |
|
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
|
|
Comparing the High Speed Comparators: National Semiconductor Application
Note (app note added 2/06) |
|
Design an Efficient Reset Circuit: 05/01/03 EDN Design Ideas /
(added 1/05) When you work with microprocessors, you must ensure that when the
power-supply voltage fluctuates to the minimum permissible level, VL, that the
processor's ALU continues to operate normally. Also, when you switch on the power
supply, the ALU must operate normally when the supply voltage equals or exceeds a
certain high level, VH.... |
|
Design Low Duty Cycle Timer Circuits: 08/22/02 EDN Design Ideas /
(added 1/05) Designing astable circuits using the industry-standard 555 timer is
a straightforward process when duty cycles are 50% or greater. However, you must
overcome the many pitfalls of low-duty-cycle circuits to arrive at a desired result.
Using only ideal components eases the design, but the components themselves are hard
to obtain.... |
|
Electronic Fuse Emulates Fast or Slow BLow Fuses: 11/09/00 EDN-Design
Ideas / (added 7/03) The electronic-fuse circuit in Figure 1 combines the properties
of a current transducer and a solid-state relay to disconnect low power at preset
levels. Using this circuit lets you avoid the bother of stocking and replacing fusible
links. The circu... |
|
Expanded Scale Indicator Revisited: 08/08/02 EDN Design Ideas /
(added 1/05) The visualization aid that a previous Design Idea describes allows
only the expansion of the upper end of the scale (Reference 1). But what can you do
if, according to your project requirements, you need to expand the middle region of
the scale? Figure 1a illustrates the challenge. A voltmeter comprises a 100-µA dc
meter and a series resistor.... |
|
Fast Voltage Comparators with Low Input Current: National Semiconductor
Application Notes,28-Jun-1996 (app note added 4/02) |
|
LB-12: Linear Brief 12 an IC Voltage Comparator for High Impedance Circuitry:
National Semiconductor Application Note (app note added 2/06) |
|
LB-32: Linear Brief 32 MicroVolt Comparator: National Semiconductor
Application Note (app note added 2/06) |
|
LB-39: Linear Brief 39 Circuit Techniques for Avoiding Oscillations in Comparator
Applications: National Semiconductor Application Note (app note
added 2/06) |
|
LB-6: Fast Voltage Comparators with Low Input Current: National
Semiconductor Application Note (app note added 2/06) |
|
Light Sensor with Hysteresis: (schematic / circuit added 10/02) |
|
LM139/LM239/LM339 a Quad of Independently Functioning Comparators: National
Semiconductor Application Note 24-Feb-1999 (app note added 4/02) |
|
Low Voltage Alarm: NE555 Low Voltage Battery Disconnect Circuit (added 4/02) |
|
MicroVolt Comparator #2: National Semiconductor Application
Notes,28-Jun-1996 (app note added 4/02) |
|
MicroVolt Comparator: National Semiconductor Application Note
(app note added 2/06) |
|
Missing Codes Tester Checks 16 Bit ADC in 7 Sec: 06/10/99 EDN-Design Ideas /
(added 7/03) As the resolution of ADCs increases from 12 to 16 bits and higher, the
difficulty in testing the"nomissing-codes"specification grows proportionately. To
fully guarantee no missing codes for a 16-bit ADC requires testing all 2 16-1 possible
output... |
|
Missing Pulse Detector (Basic): (schematic / circuit added 10/02) |
|
Precision IC Comparator Runs from Plus 5 Volt Logic Supply: National
Semiconductor Application Note 04-Nov-1995 (app note added 4/02) |
|
Synchronized Window Comparator Eliminates Error: 05/11/95 EDN-Design Ideas /
(added 3/03) Precision A/D converters need a window comparator. The window comparator
in Fig 1a is synchronized to the clock signal. This synchronization eliminates errors
that could arise when the input signal crosses the high or low threshold (Fig 1b)
unsynchronized to clock. In operation, comparator IC1A sets flip-flop IC2A high when
the input signal rises above the high threshold. Inverting comparator IC1B sets
flip-flop IC2A low when the input signal descends past the low threshold. The second
flip-flop, IC2B, synchronizes the first flip-flop's output to the rising edge of the
clock signal. Obviously, the clock signal must be significantly higher in frequency
than the input signal to avoid problems with metastability.... |
|
Two Buttons Provide Safe Start: 07/06/00 EDN-Design Ideas / (added 7/03) The
circuit in Figure 1 provides a safety interlock that checks the actuation of two
pushbuttons before enabling a relay. When you push both buttons, the circuit actuates
the relay. At that point, you can release one of the switches without the relay'... |
|
Voltage Comparator Forms Pulse Demodulator: 11/19/98 EDN-Design Ideas /
(added 3/03) |
|
Voltage Comparator Information And: (electronic design added 10/06) |
|
Voltage Comparator Switch: (electronic diagram added 6/03) |
