How do you calculate input impedance of a transistor?
The generalised formula for the input impedance of any circuit is ZIN = VIN/IIN. The DC bias circuit sets the DC operating “Q” point of the transistor and as the input capacitor, C1 acts as an open circuit and blocks any DC voltage, at DC (0Hz) the input impedance (ZIN) of the circuit will be extremely high.
What is input impedance in BJT?
Input impedance is defined as the ratio of imput voltage to input current. The significance of input impedance is that it provides a measure of the loading effect of Page 2 ECGR 3155 Signals and Electronics Laboratory EXPERIMENT 7 – BJT AMPLIFIER CONFIGURATIONS & INPUT/OUTPUT IMPEDANCES 2 the amplifier.
How is transistor input voltage calculated?
This can be done using the formula: Vcc = Vrc + Vrb + Vbe + (Ic + Ib)Rc + IbRb + Vbe, where “Vrc” is the voltage across the collector resistor; “Vrb” is the voltage across the base resistor (connected across the base) and the junction between the collector resistor and the transistor collector; and “Vbe” is the voltage …
How to calculate the output impedance of an amplifier?
The Output Impedance of an amplifier can be thought of as being the impedance (or resistance) that the load sees “looking back” into the amplifier when the input is zero. Working on the same principle as we did for the input impedance, the generalised formula for the output impedance can be given as: ZOUT = VCE/IC.
How to calculate hard saturation of a transistor?
Example 1 Recognizing Hard Saturation I c (sat) When the transistor is in hard saturation, it is conducting fully, and there is no voltage drop across its emitter-collector junctions. 2 Using DC Gain h FE =10 To guarantee hard saturation we always use the value of 10 for the DC current gain (h FE ). 3 Calculating Base Resistor Value
How do you calculate the base resistance of a transistor?
Then, using a gain of 10, we use the gain formula to find the required saturating base current I b (sat). Finally, armed with the saturating base current, and the input switching voltage at the base, we use Ohm’s Law to calculate the base resistance value.
How to calculate the voltage gain of an amplifier?
The voltage gain of a common emitter circuit is given as Av = R OUT/R EMITTER where R OUT represents the output impedance as seen in the Collector leg and R EMITTER is equal the the equivalent resistance in the Emitter leg either with or without the bypass capacitor connected.