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FET
Circuits, Page 4
FET Circuits: #'sAB-DE-HI-LMN-ST-Z Last Updated on:
Saturday, June 27, 2009 04:43 PM
Circuits Designed by Dave Johnson, P.E. :
FET INPUT HIGH SPEED LIGHT DETECTOR
This circuit is yet another design that converts current from a PIN photo diode to a
voltage. It has a bandwidth that extends beyond 50MHz.
FINGER TOUCH ACTIVATED SWITCH
It does not get any easier if you want a solid-state switch that is activated by the
touch of a finger. Two small metal pins route voltage through the finger skin to a
MOSFET switch. The circuit is great for situations where a membrane type mechanical
switch is not desired.
High Impedance JFET Buffers I have used these circuits many
times. They are great when you need a low gain AC signal amplifier with a very
high input impedance. It is good to beyond 50MHz. (added
12/04)
Links to electronic circuits, electronic schematics, designs for engineers,
hobbyists, students & inventors:
Gate Drive Method Extends Supply's Input Range: 06/26/03 EDN-Design
Ideas / (schematic / circuit added 11/03) Industrial and telecom applications often
require a nonisolated, low-voltage supply from a high-voltage input. IC manufacturers
have responded to that need with the application of high-voltage processes and offer
control ICs that work to 50V and higher. That voltage is sometimes insufficient, and
you need further design techniques to extend the input voltage...
High impedance FET probe extends RF Spectrum analyzer's usable range: 02/05/2004
EDN-Design Ideas In low-noise analog circuits, a high-gain amplifier serves at
the input to increase the SNR. The input signal level determines the input-stage gain;
low-level signals require the highest gain. It is also standard practice in low-noise
analog-signal processing to make the circuit's bandwidth as narrow as possible to pass
only the useful input-signal spectrum. (added 6/06)
High Voltage, High Efficiency MOSFET RF Amplifiers: Application Note
Microsemi-formerly Advanced Power Technology APT0001 ( app note added 2/07)
