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Charge Pump Circuits Page 3 Charge Pumps: #-CD-NO-Z Last Updated on:
Friday, July 18, 2008 11:32 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 / (added 1/05) 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 ....
Tripler Converts 5 to 15V: 08/17/00 EDN-Design Ideas / (added 1/06) 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....
Tripler Converts 5 Volt to 15V: Maxim Application Note #297 (app note added 7/03) 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 3VIN -2VD, ....
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