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FET Circuits, Page 3
FET Circuits:  #'s     A      B-D      E-H      I-L      M       N-S    
T-Z
Last Updated on:
Tuesday, April 01, 2014 04:29 AM


Circuits Designed by Dave Johnson, P.E. :
  • CHARGE COUPLED BI-DIRECTIONAL POWER MOSFET RELAY
    The circuit uses an inexpensive C-MOS inverter package and a few small capacitors to drive two power MOS transistors from a 12v to 15v supply. Since the coupling capacitor values used to drive the FETs are small, the leakage current from the power line into the control circuit is a tiny 4uA. Only about 1.5mA of DC is needed to turn on and off 400 watts of AC or DC power to a load.

  • Charge Coupled MOSFET Relay
    This circuit acts as an AC/DC relay with a rating up to 50 volts peak and up to 10 amps of current.  The differential oscillator supplies voltage to the gates of the two FETs with good isolation will drawing only 1.5ma of current.
  • CIRCUIT PROTECTS FROM BATTERY POLARITY REVERSAL
    This simple circuit can protect a sensitive electronic circuit from an accidental connection of a battery with a reversed polarity.  The N-channel FET connects the electronic device to the battery only when the polarity is correct.  The circuit shown was designed for a device powered from a single 1.5 volts button cell battery.  However, the circuit will operate with higher voltages as well.


Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:
Basic EPAD MOSFET Connection with Current Source Drive -  Circuit Ideas for Designers Application Notes Advanced Linear Devices, Inc.....[App Note]
Basic MOSFET/ EPAD MOSFET Inverter Circuit -  Circuit Ideas for Designers Application Notes Advanced Linear Devices, Inc.....[App Note]
Basic MOSFET/EPAD MOSFET Diode-Connected Circuit  -  Circuit Ideas for Designers Application Notes Advanced Linear Devices, Inc.....[App Note]
Better MOSFET H Bridge -  (schematic / circuit added 6/07)
Bit reverser scrambles data for FFT -  03/02/95 EDN-Design Ideas..... EDN is migrating links. This link is not verified.  Search the "title" + "EDN" for new link.
Capabilities Of Low-Cost High Voltage RF Power MOSFETs At Hf & Vhf -  Application Note Microsemi-formerly Advanced Power Technology APTB981  ( app note added 2/07)
Cascode MOSFET increases boost regulator's input  and output voltage ranges -  1-Sep-05 Issue of EDN  Simple enhancement extends range of both sides of regulator..... [Design Idea by Scot Lester, Texas Instruments, Dallas, TX; Edited by Brad Thompson and Fran Granville]
Charge Coupled Bi-Directional Power Mosfet Relay -  The circuit uses an inexpensive C-MOS inverter package and a few small capacitors to drive two power MOS transistors from a 12v to 15v supply. Since the coupling capacitor values used to drive the FETs are small, the leakage current from the power line into the control circuit is a tiny 4uA. Only about 1.5mA of DC is needed to turn on and off 400 watts of AC or DC power to a load. Published in Electronic Design, Nov. 8, 1990. . [Designed by David A. Johnson]
Charge Coupled MOSFET Relay #2 -  This circuit acts as an AC/DC relay with a rating up to 50 volts peak and up to 10 amps of current.  The differential oscillator supplies voltage to the gates of the two FETs with good isolation will drawing only 1.5ma of current. . [Designed by David A. Johnson]
Charge Pump Efficiently Divides Supply Voltage  -  This circuit uses a few FETs and logic devices to down convert a DC voltage to about one half its value . [Designed by David A. Johnson]
Circuit Detects Current Pulses -  01/06/94 EDN-Design Ideas.....The pulse detector provides a visible indication of positive and negative current pulses. The pulses amplitudes can vary from20 to150 mA. The pulses durations can range from10 to40 msec, and their repetition rate can span40 to180 pulses/minute..... [Design Idea by Richard McGillivray, Grey Bruce Regional Health Centre, Owen Sound, Ontario, Canada]
Circuit improves on bias for GaAs FETs -  6-Dec-01 Issue of EDN  It's important to properly sequence the bias applied to an RF/microwave GaAs FET or a MMIC (monolithic-microwave-IC] amplifier. These devices are extremely sensitive to drain and gate voltage levels as well as to the order in which these biases turn on and off. A GaAs-FET amplifier that uses two bias voltages-a negative supply, VGG, on its gate and a positive supply, VDD, on its dra..... [Design Idea by Tom Roberts, Anritsu Co, Morgan Hill, CA]
Circuit Protects from Battery Polarity Reversal -  This simple circuit can protect a sensitive electronic circuit from an accidental connection of a battery with a reversed polarity.  The N-channel FET connects the electronic device to the battery only when the polarity is correct.  The circuit shown was designed for a device powered from a single 1.5 volts button cell battery.  However, the circuit will operate with higher voltages as well. . [Designed by David A. Johnson]
Circuit reduces negative voltage stresses on control IC -  18-Apr-02 Issue of EDN  In a synchronous, buck switching power supply, the two FETS and the output inductor meet at the phase node (Figure 1]. The phase node often connects directly to the control IC. The voltage on this node swings from the input voltage to some voltage lower than ground. If the voltage goes too far below ground, the ESD structures or other circuitry within the control IC can become forward-bia..... [Design Idea by Michael Day, Texas Instruments Inc, Dallas, TX]
Considerations for Driving Power MOSFETs in High-Current, Switch Mode Regulators -  Microchip Application Note Published 12-Nov-02  (app note added 2/06)
Converting GaAs FET Models for Diffrent Nonlinear Simulators 10/26/97  -  Application Note California Eastern Laboratories Doc #905.....[App Note]
Defining Diode Data Sheet Parameters -  This application note will take the reader on a tour of parameters used by Advanced Power Technology in their diode data sheets. In most cases the intent will be to define and explain. In a few cases more discussion will be provided to clarify the usage of data sheet information. The note will be divided into sections corresponding to the sections of the data sheets.  Application Note Microsemi APT0301 (app note added 4/08)
Designing High Power GaAs FET Amplifies Using Single Cell FET Parameters 1/17/98  -  Application Note California Eastern Laboratories Doc #912.....[App Note]
Determining MOSFET Driver Needs for Motor Drive Applications -  Microchip Application Note Published 31-Dec-03  (app note added 2/06)
Differential EPAD MOSFET  Matched-Pair Circuit with Buffered & Summed Outputs -  Circuit Ideas for Designers Application Notes Advanced Linear Devices, Inc.....[App Note]
Differential EPAD MOSFET  Matched-Pair Circuit with Summing Output -  Circuit Ideas for Designers Application Notes Advanced Linear Devices, Inc.....[App Note]
Diode-Connected EPAD MOSFET with Buffer Amplifier Output -  Circuit Ideas for Designers Application Notes Advanced Linear Devices, Inc.....[App Note]
Driving a N Channel FET from TTL -  Meant as a quick n easy example of how to switch high current12V dc from TTL.   (added 4/02)

FET Circuits:  #'s     A      B-D      E-H      I-L      M       N-S     T-Z


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