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10 Khz VFC uses Charge Pump Variation - 04/09/98 EDN-Design Ideas
A diode-capacitor charge pump is the starting point for many
voltage-to-frequency-converter (VFC] designs. The circuit in Figure 1 uses a
variation on that classic theme to achieve linearity less than 0.05%,....several
circuits included, scroll the find this one.... [Design Idea by Stephen Woodward,
University of North Carolina, Chapel Hill, NC] |
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100ma UltraLow Noise Charge Pump LED Supply with Output Current Adjust -
Linear Technology LTC3201 (app note added 6/06) |
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12V Touch Switch Exciter Circuit - This circuit is designed to generate
a 20KHz pseudo sine wave signal that can power about 50 remote touch activated
switch circuits. It can support a cable length of about 2500 feet. A
typical remote switch circuit is also shown as well as a receiver circuit for
those switches.... [Designed by David A. Johnson] |
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200mhz-400mhz Voltage Controlled Oscillator (VCO) - If you need a clean
emitter coupled logic (ECL) type signal between 200MHz and 400MHz this circuit
works fine. It uses four voltage-controlled capacitors to change the frequency....
[Designed by David A. Johnson] |
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300v Peak to Peak Signal Generator - This circuit converts a square wave
signal to a +-150 volt output signal with fast 100nS rise and fall times....
[Designed by David A. Johnson] |
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40kHz LED Test Signal Generator - This 40KHz crystal controlled
oscillator circuit drives an infrared LED with powerful 40ma pulses. The
circuit can be used to test optical communications circuits, designed to receive
40KHz modulated light signals.... [Designed by David A. Johnson] |
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5V power supply teams low dropout regulator, charge pump - 8-Jan-04
Issue of EDN Auxiliary power of 3.3V is replacing the 5V auxiliary power
that "silver boxes" supply in most computer systems, but some circuits still
require a 5V supply. Such systems impose the messy task of creating a central 5V
auxiliary supply from the 3.3V auxiliary supply and then routing 5V power
throughout the motherboard.... [Design Idea by Jim Christensen, Maxim Integrated
Products, Sunnyvale, CA] |
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AN152 Using the CS5521/22/23/24/28 & CS5525/26 Charge Pump Drive for External
Loads - (app note added 6/07) |
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AN-347: Shielding & Guarding - AN-347 Analog Devices Application Note
(app note added 2/06) |
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AN-348: Avoiding Passive-Component Pitfalls - AN-348 Analog Devices
Application Note (app note added 2/06) The Wrong Passive Component Can
Derail Even Best Op Amp or Data Converter. Here Are Some Basic Traps to
Watch For. |
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AN-349: Keys to Longer Life for CMOS - AN-349 Analog Devices Application
Notes (app note added 09/08) Here's How CMOS Can be Protected Against Abuse
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AN-703: Driving High Power LEDs - AN-703 Analog Devices Application Note
(app note added 2/06) |
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AN-772: A Design & Manufacturing Guide for the Lead Frame Chip Scale Package -
AN-772 Analog Devices Application Note (app note added 2/06) |
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AN813: Applying the TC1219/TC1220 Inverting Charge Pumps with Small External
Capacitor Values - Microchip Application Note Published 20-Sep-04
(app note added 06/06/06) |
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Audio Frequency Digital Noise Generator - When you need to test an audio
circuit with broadband noise, this circuit works great. It uses just three
inexpensive C-MOS ICs that generate a series of output pulses whose widths vary
randomly. I included a level control pot. …. [Designed by David A. Johnson] |
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Avoiding Passive-Component Pitfalls - AN-348 Analog Devices Application
Note (app note added 2/06) The Wrong Passive Component Can Derail Even
Best Op Amp or Data Converter. Here Are Some Basic Traps to Watch For.
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Boost Converter Generates 3 Analog Rails - Maxim Application Note #2026
In Figure 1, a standard boost converter consisting of IC1, C1, L1, D1, and C2
generates, in addition to main output, two auxiliary supply rails (10V and
-5V) with addition of some small and very low-cost extra components....(app
note added 5/08) |
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Boost Converter Generates Three Analog Rails - 07/02/98 EDN-Design Ideas
The standard boost converter in Figure 1 uses not only IC1, C1, L 1, D1, and C2 to
generate a main 5V output, but also additional small, low-cost components to
provide two auxiliary supply rails of 10 and –5V....PDF has several circuits,
please scroll to find this one.... [Design Idea by TIM HERKLOTS, MAXIM INTEGRATED
PRODUCTS LTD, THEALE, BERKSHIRE, UK] |
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Buck/Boost Charge Pump Regulator Powers White LEDs from a Wide 1.6 Volt to 5.5
Volt Input - Maxim Application Note #1021 (app note added 5/08)
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Build a charge pump with ultralow quiescent current - 5-Aug-04 Issue of
EDN Portable battery-powered devices often spend most of their life in
standby mode, in which the quiescent current of an internal boost converter
continuously bleeds the battery. The quiescent current during standby can be
larger than the actual load current. Though several inductor-based converters
offer maximum quiescent current of less than 10 µA, designers usually prefer or
require a regu.... [Design Idea by Greg Sutterlin, Maxim Integrated Products,
Sunnyvale, CA] |
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Caps Provide Voltage Boost To Series Regulator - This circuit adds some
capacitors and diodes to a traditional transformer type series regulator circuit
to extend the normal operating range. It can insure regulation during low line
voltage conditions or it can squeeze a few more watts out of a plug-in-the-wall
power adapter power supply. …. [Designed by David A. Johnson] |
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Charge Pump & Step Up DC DC Converter Solutions for Powering White LEDs in Series
or Parallel Connections - Maxim Application Note #1037 (app note added
5/08) |
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Charge pump converts –5V to 5V - 20-Jan-05 Issue of EDN Versatile
switched-capacitor charge-pump voltage converters can provide a negative supply
voltage from a positive-voltage source or double a positive source's voltage.
However, certain applications that consist entirely of ECL (emitter-coupled-logic]
circuits provide only a negative-voltage supply—for example, -5.... [Design Idea
by Ken Yang, Maxim Integrated Products Inc, Sunnyvale, CA] |
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Charge Pump Converts Volt in to ± Volt Out - 02-Sep-99 Issue of EDN
A charge-pump IC's ability to produce both VIN and -VIN outputs allows the
circuit in Figure 1 to generate separate positive and negative outputs from a
single input voltage, regardless of the input-voltage polarity. For example, the
circuit allows an RS-232C interface.... [Design Idea by Ioan Ciasci, Rei Data,
Cluj-Napoca, Romania] |
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Charge Pump Doubles Negative Voltage - Maxim App Note #782 (app note
added 5/08) |
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Charge Pump Efficiently Divides Supply Voltage - This circuit uses a
few FETs and logic devices to down convert a DC voltage to about one half its
value …. [Designed by David A. Johnson] |
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Charge Pump Generates Positive Bias - 03/02/95 EDN-Design Ideas
Placing the averaging filter inductor in the output return leg of an isolated
forward-converter power supply can significantly reduce the common-mode noise the
supply generates. This technique can eliminate some of the high-frequency
spikes present on the output voltage.... [Design Idea by Steve Mowry, Siemens
Industrial Automation, Johnson City, TN] |
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Charge Pump Voltage Quadrupler - Simple circuit that will quadruple an
input voltage. Useful for bias supplies and programming voltages. (Circuit design
added 10/06) |
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Charge-pump circuit divides by two - 02/18/99 Issue of EDN Small
size and efficiency approaching 100% make switched-capacitor charge pumps popular
for voltage doubling and inverting in miniature dc-dc applications. Few are aware,
however, that most charge pumps can halve as well as double or invert an input
voltage. The increasing adoption of low-voltage logic makes this ÷2 capability
useful for generating low-voltage supplies in portable....Page includes several
designs. Scroll to find this one.... [Design Idea by Budge Ing, Maxim
Integrated Products, Sunnyvale, CA] |
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Choosing the Right Power Supply IC for Your Application - Maxim
Application Note #737 (app note added 5/08) |
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Circuit Provides +5 Volt Gate Bias From 48 Volt Input - Maxim
Application Note #1803 (app note added 5/08) |
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Circuit Provides 5V Gate Bias From48V - 09/19/02 EDN-Design Ideas
A small and simple circuit derives 5V from the -48V rail that telecomm
applications typically use (Figure 1]. Useful for gate bias and other purposes,
the 5V supply delivers as much as 5-mA output current. A shunt
reference....[Design Idea added 1/05] EDN is migrating links. This link is not
verified. Search the "title" + "EDN" for new link. |
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CMOS Inverters Form 125kHz Oscillator - This circuit is similar to
schematic CMOS INVERTER 125KHz LC OSCILLATOR but inverts the LC components so the
inductor is grounded. Two inverters are needed to produce the needed
oscillation. Again, the values shown set the frequency at 125KHz but can be
changed to produce other frequencies.... [Designed by David A. Johnson] |
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CMOS Nand Gate Forms Gated 125kHz Oscillator - This circuit is similar
to schematic CMOS INVERTER 125KHz LC OSCILLATOR but uses a NAND gate as an
inverter. The gate allows the oscillator to be gated on and off.
Again, the values shown set the frequency at 125KHz but can be changed to produce
other frequencies.... [Designed by David A. Johnson] |
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Compact Inductorless Boost Circuit Regulates White LED Bias Current -
Maxim Application Note #1116 (app note added 5/08) |
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Controlling a Variable Voltage Power Supply using the DS1809 Pushbutton Control
- Maxim Application Note #1035 (app note added 5/08) |
