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FET Circuits, Page 4
FET Circuits: #'sAB-DE-HI-LM
N-ST-Z Last Updated on:
Monday, August 18, 2008 04:17 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)
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