What is Q point of Zener diode?
What is Q point of Zener diode?
The Q-point (operating point) of the Zener diode is the point of intersection of the load line curve and the characteristic curve of the Zener diode. The point of intersection gives the quiescent current and the corresponding quiescent voltage .
What is the operation of Zener diode?
A Zener diode operates just like a normal diode when it is forward-biased. However, a small leakage current flows through the diode when connected in reverse biased mode. As the reverse voltage increases to the predetermined breakdown voltage (Vz), current starts flowing through the diode.
How Q point is determined?
Generally, the Q-point of the amplifier is half-way along the load line so the Collector current will be given as half of 9.2mA. Therefore Q = 4.6mA. This DC load line produces a straight line equation whose slope is given as: -1/(RL + Re) and that it crosses the vertical Ic axis at a point equal to Vcc/(RL + Re).
What is the point of a diode?
A diode is a device that allows current to flow in one direction but not the other. This is achieved through a built-in electric field. A diode is a device that allows current to flow in one direction but not the other.
What are the factors affecting stability of Q point?
Factors affecting stability of Q point: Even if we have selected a proper Q point it tends to shift its positions due to following. All three variables β, IB and ICO are dependent on temperature. This causes Q point to shift, thus leading to distortion. Variation in transistor parameters of the same type of transistor.
What are the parameters that cause variation of Q point?
Q Point Instability due to Temperature: Due to increase in temperature the following parameters of a transistor will change: 1 VBE: The base to emitter voltage decreases at a rate of 2.5 mV/? with increase in temperature. The base current IB will therefore increase and it will force IC to change, and hence the Q point.
What is Q point and load line?
The DC load line is the load line of the DC equivalent circuit, defined by reducing the reactive components to zero (replacing capacitors by open circuits and inductors by short circuits). It is used to determine the correct DC operating point, often called the Q point.