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Charge Pump Circuits
Page 3 Charge Pumps:
#-CD-NO-Z
Last Updated on:
Thursday, October 29, 2009 10:05 AM
Circuits Designed by Dave Johnson, P.E. :
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.
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%.
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.
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.
Links to electronic circuits, electronic schematics, designs for engineers, hobbyists,
students & inventors:
Simple 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.... .....(design idea added 1/05)
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. .(designed by David
A. Johnson)
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
added 1/06)
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....
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)
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)
