Circuit improves on bias for GaAs FETs: 12/06/2001 EDN -
Design Ideas / 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... . |
Circuit reduces negative voltage stresses on control IC:
04/18/2002 EDN - Design Ideas / 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... . |
CMOS Linear Applications: National Semiconductor AppNote #88
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FET Dip Meter: Circuits uses the Lambda Negative Resistance
Circuit |
FET Preamp Cable: |
Forward Converters Drive Power MOSFETs At up to 500kHz:
06/09/94 EDN-Design Ideas |
Gate drive method extends supply's input range: 06/26/03
EDN-Design Ideas / 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... |
IC maintains uniform bias for GaAs MESFETs: 08/22/2002 EDN
- Design Ideas / The gate-turn-on threshold voltage for GaAs
MESFETs (gallium-arsenide metal-semiconductor field-effect
transistors) varies considerably from part to part, even within
a given lot. That behavior makes biasing difficult, especially
if you want to design the device into a high-volume product. To
overcome this drawback, you can introduce a current sensor that
monitors the bias current and provides .... |
Improve FET based gain control: 12/06/2001 EDN - Design
Ideas / One problemwith standard FET gain-control circuits is
increased noise when you use the FET as a part of a resistive
attenuator in series with an op amp. This configuration
attenuates the signal before amplification; hence, it requires
much higher gain bandwidth and better noise performance from the
op amp. . |
Low Cost MOSFET Quashes Power Resistor: 06/09/94 EDN-Design
Ideas |
Micro Spy With FETs: |
MOSFET Beats Murphy's Law: 12/22/94 EDN-Design Ideas
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MOSFET Circuit UPS Regulator's Output Current: 02/01/96 EDN-Design
Ideas / Use a current mirror and a power MOSFET to increase the
output-current capability of an IC-voltage regulator
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MOSFET Current Sensing: Method of mirror current sensing a
MOSFET |
MOSFET Power Amplifiers: A discussion of the benefits of the
lateral MOSFET output devices used in today’s High Power audio
amplifiers |
MOSFET PowerAmp: DIY high power MOSFET amplifier200 Wrms 8
ohms -350 Wrms4 ohms |
MOSFET Replaces Switch #1: 01/20/94 EDN-Design Ideas / By
using a cheap, readily available MOSFET, you can use a
single-pole switch to turn a bipolar power supply on and off
without consuming extra power. In Fig1, the switch simply
controls the MOSFET gate, which switches on the negative supply.
Resistor R, which can be several megohms, is not necessary if
the ±6V rails are permanently connected to a load, such as an
op-amp circuit. Because the MOSFETs RDS(ON) is a fraction of an
ohm, power loss is minimal, and the circuit suits
moderate-consumption, battery-operated circuitry
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MOSFET Replaces Switch #2: 02/03/94 EDN-Design Ideas / You
can use a single-pole switch to turn a bipolar power supply on
and off without consuming extra power
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MOSFET serves as ultrafast plate driver: 10/03/2002 EDN -
Design Ideas / The circuit in Figure 1 provides a 20-MHz square
wave across a set of highly capacitive ion-deflection plates in
an experimental instrument. To get the required deflection, the
plate voltage must be 20 to 30V, much higher voltage than
conventional logic or driver families can provide. To minimize
artifacts, the rise and fall times must be very fast, with a
minimum of overshoot and ringing.. |
MOSFET switch provides efficient AC / DC conversion:
02/17/00 EDN-Design Ideas |
Simple 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.
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Simple Isolated Supply Design Suits FixedDCVoltage Systems :
12/23/02 Electronic Design - Ideas for Design / Most
high-voltage systems that include low-voltage ICs must inject
isolated supplies into their setups. The design and
implementation of these supplies is usually quite involved.
However, a simple approach is possible for systems in which
the... |
Single FET Controls LED Array: 04/12/01 EDN-Design Ideas /
PDF contains multiple circuits - scroll to find this circuit. |
Static Electricity / Negative Ion Detector: This circuit
relies upon the extra high input impedance of a FET, and also
demonstrates the gate terminals sensitivity to changes in
voltage. |