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Charge Pump Circuits
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Charge Pumps:
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Last Updated on:
Monday, October 03, 2011 06:07 PM |
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Circuits Designed by Dave Johnson, P.E. : |
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SQUARE WAVE DRIVER HAS FLEXIBLE OUTPUTS
This circuit can produce an output signal ranging from DC to 100KHz. It can source a
voltage ranging from 1v to 30v. It can sink a voltage ranging from zero volts to
30v. It can drive up to 200ma of current and can even be switched to a floating
tristate output.
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ULTRA PURE 125KHz SINE WAVE SIGNAL SOURCE
For some RFID systems operating at 125KHz, a very low distortion signal source
reference is needed. The circuit shown on this page produces a 10 volt peak to
peak signal into a 50 ohm load, with a distortion of only 0.01%.
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VERY LOW POWER GATED CRYSTAL OSCILLATOR
The circuit gates the output of a continuously operating 32KHz crystal oscillator to
the input of a C-MOS buffer when clock pulses are needed. The technique gets around
the problem of a slow starting crystal oscillator by keeping the oscillator going
and switching on a transistor power stage only as needed. The method keeps the
standby power consumption to a very low 1uA when used with a 3v supply.
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WHITE LED NIGHT LIGHT
This simple circuit is designed to plug into a standard AC electrical outlet.
It uses four super bright white light emitting diodes (LED) in conjunction with a
capacitor coupled full wave rectifier circuit. The LEDs are mounted in a box and are
angled slightly to bounce the light off of a nearby wall. The light should
last about 10 years. The circuit draws less than one half of one watt of power
and can therefore run continuously. In spite of the low power, the LEDs
provide sufficient illumination for most night light applications. Circuit
component values for both 120vac and 240vac are shown.
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Links to electronic circuits, electronic schematics, designs for engineers, hobbyists,
students & inventors:
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Simple circuit provides 5V gate bias from 48V - 19-Sep-02 Issue of EDN
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, IC1,
defines -5V as ground reference for a charge pump, IC2. The charge pump doubles
this 5V difference between system ground and charge-pump ground to produce 5V with
res.... [Design Idea by Will Hadden, Maxim Integrated Products, Sunnyvale, CA] |
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Simple Methods Reduce Input Ripple for All Charge Pumps - Maxim App Note
#2027 (app note added 5/08) |
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Square Wave Driver Has Flexible Outputs - This circuit can produce an
output signal ranging from DC to 100KHz. It can source a voltage ranging from 1v
to 30v. It can sink a voltage ranging from zero volts to 30v. It can drive up to
200ma of current and can even be switched to a floating tristate output.
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[Designed by David A. Johnson] |
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Supplying Power via the1 Wire Bus - Maxim Application Note #949 (app
note added 5/08) |
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Tiny Charge Pump Provides Highly Reliable Low Cost Solution to Negative Reference
Voltage - Maxim App Note #348 (app note added 5/08) |
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Trading Performance for Cost in Portable Power Supplies - Maxim App Note
#269 (app note added 5/08) |
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Triple Capacitive Voltage Inverter with the Max871 - Maxim App Note
#1875 (app note added 5/08) |
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Tripler Converts 5 to 15V - 08/17/00 EDN-Design Ideas By
configuring a charge-pump voltage doubler as a tripler, you can readily derive 15V
from 5V (Figure 1]. A 15V rail is useful for powering op amps, LCD-bias circuits
and other low-current applications. The connections shown configure the IC1
voltage doubler as a tripler. The no-load output voltage of the circuit is
approximately 3VIN2VD,.... [Design Idea by Ken Yang, Maxim Integrated Products,
Sunnyvale, CA] |
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Tripler Converts 5 Volt to 15V - Maxim Application Note #297 (app note
added 5/08) By configuring a charge-pump voltage doubler as a tripler, you can
readily derive 15V from 5V (Figure 1). A 15V rail is useful for powering op amps,
LCD-bias circuits, and other low-current applications. The connections shown
configure the IC1 voltage doubler as a tripler. The no-load output....
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Ultra Pure 125kHz Sine Wave Signal Source - For some RFID systems
operating at 125KHz, a very low distortion signal source reference is needed.
The circuit shown on this page produces a 10 volt peak to peak signal into a 50
ohm load, with a distortion of only 0.01%.... [Designed by David A. Johnson] |
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Very Low Power Astable Multivibrator - This classic circuit draws only
200 nanoamps from a 1.5v supply.... [Designed by David A. Johnson] |
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Very Low Power Gated Crystal Oscillator - The circuit gates the output
of a continuously operating 32KHz crystal oscillator to the input of a C-MOS
buffer when clock pulses are needed. The technique gets around the problem of a
slow starting crystal oscillator by keeping the oscillator going and switching on
a transistor power stage only as needed. The method keeps the standby power
consumption to a very low 1uA when used with a 3v supply.
. [Designed by David A.
Johnson] |
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Charge Pumps: #-C
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