September 2008
You are currently browsing the articles from circuitmaniac.com written in the month of September 2008.
This type of power MOSFET is widely used in digital computers. The construction of enhancement type power MOSFET is shown in figure above .This is an n-channel device.However as seen in the figure,the p-substrate extends right up to the silicon dioxide layer.Thus there is no n-channel between drain and source. The above figure shows the [...]
Written by John on September 30th, 2008 with 1 comment.
Read more articles on Enhancement type MOSFET and MOSFET and Power Electronics.
Drain characteristics of an n-channel MOSFET is shown in figure below. VGS can be positive and negative.The characteristics for p-channel are similar to the above figure excepts signs of current and voltage are reversed. The transconductance curve(transfer characteristics)of depletion type MOSFET is shown in figure below. This characteristcs shows the variation of ID with VGS.IDSS [...]
Written by John on September 30th, 2008 with no comments.
Read more articles on Depletion type MOSFET and MOSFET.
i) Negative Gate Operation In the figure given below a negative bias is applied to the gate The negative voltage depletes the conducting channel of majority carriers electrons and controls their flow. The gate and channel forms a parallel plate capacitor with silicon dioxide layer as dielectric.The negative gate bias causes concentration of electrons on [...]
Written by John on September 29th, 2008 with 1 comment.
Read more articles on Depletion type MOSFET and Power Electronics.
Power MOSFET is a voltage controlled device and it requires only small input current.It has extremely high input impedance and is widely used in switching devices.The switching is high and the switching time is in the order of nanoseconds.They are used in low power high frequency converters.MOSFETs are of two types. i) Depletion Type MOSFET [...]
Written by John on September 29th, 2008 with 1 comment.
Read more articles on Depletion type MOSFET and MOSFET.
A generating station in which nuclear energy is converted into electrical energy is known as a nuclear power station In nuclear power station, heavy elements such as Uranium (U235) or Thorium (Th232) are subjected to nuclear fission in a special apparatus known as a reactor. The heat energy thus released is utilised in raising steam [...]
Written by John on September 28th, 2008 with 1 comment.
Read more articles on Nuclear power plant and Power Plant.
Power transistors are finding increasing popularity in low to medium power applications.A power transistor has low current gain and requires continuous base drive during on-state conditions but doesn’t require forced commutations.Circuitry power transistors can be used in high switching frequency,permitting size reduction of electromagnetic components and can provide current limit protection by base drive circuit.Power [...]
Written by John on September 28th, 2008 with no comments.
Read more articles on Power Electronics and Power transistor.
A power diode is a two terminal p-n junction device and a p-n junction normally formed by allowing diffusion and epitaxial growth structure of a power diode and symbol are shown in figure below. High power diodes are silicon-rectifiers that can operate at high junction temperatures.Power diodes have larger Power,Voltage and Current handling capabilities than [...]
Written by John on September 28th, 2008 with 3 comments.
Read more articles on Power diode and Power Electronics.
The electronics power conversion circuit that convert and control electrical power, use Power Semiconductor devices. These devices operate in the switching mode, which causes the losses to be reduced and therefore the conversion efficiency is to be improved. However the disadvantages of switching mode operation are the generation of harmonics and the fact that the [...]
Written by John on September 27th, 2008 with no comments.
Read more articles on Power Electronics.
We have treated the gain of the op-amp as a constant.However it is a complex number that is a function of frequency.Therefore at a given frequency the gain will have a specific magnitude as well as phase angle.The manner in which the gain of the op-amp response to different frequencies is called the frequency response.A [...]
Written by John on September 27th, 2008 with no comments.
Read more articles on Linear Integrated Circuits and op-amp.
In the inverting amplifier,only one input is applied and that is to the inverting input terminal.The non-inverting input terminal is grounded since V1=0V and V2=Vin. Therefore Vo = -A(Vin) The negative sign indicates the output voltage is out of phase with respect to input by 180 degree or is of opposite polarity.Thus in the inverting [...]
Written by John on September 27th, 2008 with no comments.
Read more articles on Linear Integrated Circuits and op-amp and op-amp applications.
The figure shows the open loop configuration of differential amplifier in which the input signals Vin1 and Vin2 are applied to the positive and negative input terminals since the op-amp amplifies the difference between the two input signals,this configuration is called differential amplifier.Vin1 and Vin2 could be either ac or dc voltages.The source resistances Rin1 [...]
Written by John on September 26th, 2008 with no comments.
Read more articles on Linear Integrated Circuits and op-amp and op-amp applications.
The function of the last stage in an op-amp is to supply the load current and provide a low impedance output.a simple output stage is an emitter follower with complementary transistors.When Vi is positive,transistor Q1 is on and supplies current to load RL .If Vi is negative,Q1 is cutoff and Q2 acts as a sink [...]
Written by John on September 26th, 2008 with no comments.
Read more articles on Linear Integrated Circuits and op-amp and Stages of op-amp.
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