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Does reverse biasing an LED for a period of time reduce its forward biased threshold voltage?
yes
Which biasing is known to as universal biasing?
voltage divider biasing
What is the effect on threshold voltage of a mos capacitor on increasing substrate doping concentration?
The threshold voltage will be increased (in case of an N-Mos), because the charge in the depletion region formed under the channel will be more (high density) and hence gate voltage has to overcome this charge for strong inversion. Vt = (work function difference of gate and substrate) + 2*(substrate Fermi voltage) + (Qd/Cox) Where, Qd = charge in Depletion region in Coulomb Cox = Oxide capacitance
Why substrate in nmos connected to ground and pmos connected to vdd?
In CMOS technology, the NMOS transistor's substrate is connected to ground to prevent parasitic effects and ensure proper operation, as it helps maintain a lower threshold voltage for the NMOS. Conversely, the PMOS substrate is connected to VDD to keep its threshold voltage stable and ensure that the PMOS operates correctly in the enhancement mode. This arrangement minimizes unwanted channel formation and enhances performance by reducing leakage currents in both types of transistors.
What is the Purpose of dc biasing in transistors?
in order to establish the Q-point of transistor
What the threshold voltage depends on?
The threshold voltage of a device, such as a transistor, depends on its physical structure and material properties, such as channel length, channel doping concentration, oxide thickness, and gate material. It is also affected by external factors like temperature and supply voltage. In digital circuits, the threshold voltage is a critical parameter that determines the device's switching behavior.
Does reverse biasing an LED for a period of time reduce its forward biased threshold voltage?
yes
Which biasing is known to as universal biasing?
voltage divider biasing
How biasing of FET differs from biasing of BJT?
in BJT forwardbiasing & reverse biasing are carried out but in FET voltage divider biasing &self biasing are carried out.
What is the effect on threshold voltage of a mos capacitor on increasing substrate doping concentration?
The threshold voltage will be increased (in case of an N-Mos), because the charge in the depletion region formed under the channel will be more (high density) and hence gate voltage has to overcome this charge for strong inversion. Vt = (work function difference of gate and substrate) + 2*(substrate Fermi voltage) + (Qd/Cox) Where, Qd = charge in Depletion region in Coulomb Cox = Oxide capacitance
What is the function of Substrate in MOSFET?
it will control the flow of electrons between the source and drain,the controlling will be depends upon the input voltage to the substrate.
Why is a Schmitt trigger called a regenerative comparator?
A Schmitt Trigger is a comparator, because it compares its input voltage to a "threshold" voltage, but it has _two_ threshold voltages (the upper and lower trigger voltages), and which threshold voltage is used depends on the output state. If the input voltage is higher than the upper trigger voltage, the output will be high (for a non-inverting Schmitt trigger). In this state, the input is compared to the lower threshold voltage, so the input now has to go below the lower threshold voltage before the output will go low. The threshold voltage depends on the output state, such that a high output selects the lower threshold voltage, and a low output selects the upper threshold voltage. This can be visualised as using a fixed threshold but adding a small voltage (the difference between the upper and lower threshold voltages, also called the hysteresis voltage) to the input voltage before it is compared. This small added voltage is high when the output is high, and low when the output is low. A small amount of the output voltage is effectively being added to the input voltage before it is compared to a fixed threshold. This is positive feedback, also called regenerative feedback. So a Schmitt trigger operates as a voltage comparator, and a small amount of the output is added to the input, so it uses positive or regenerative feedback.
Why substrate in nmos connected to ground and pmos connected to vdd?
In CMOS technology, the NMOS transistor's substrate is connected to ground to prevent parasitic effects and ensure proper operation, as it helps maintain a lower threshold voltage for the NMOS. Conversely, the PMOS substrate is connected to VDD to keep its threshold voltage stable and ensure that the PMOS operates correctly in the enhancement mode. This arrangement minimizes unwanted channel formation and enhances performance by reducing leakage currents in both types of transistors.
What is the Purpose of dc biasing in transistors?
in order to establish the Q-point of transistor
What is the special properties of a diode?
in the negative biasing it gives the constant voltage irrespective of limited current.......the voltage it provides in the negative biasing is known as 'zener voltage' due to this property zener voltage is used as voltage regulator........voltage regulator is a circuit which gives constant output even the input is changing.
What is the special property of a zener diode?
in the negative biasing it gives the constant voltage irrespective of limited current.......the voltage it provides in the negative biasing is known as 'zener voltage' due to this property zener voltage is used as voltage regulator........voltage regulator is a circuit which gives constant output even the input is changing.
Why fixed bias is called so?
because we are not varying the biasing voltage
