DC and AC analyses of a fixed-bias BJT amplifier with a temperature stabilizing resistor 30 October 2013

Perform DC analysis of the fixed-bias BJT amplifier with a temperature stabilizing resistor below to find the operating point of BJT. Calculate all related voltages and currents in the circuit. Used information obtained from DC analysis to further perform AC analysis to find the small signal voltage gain, input and output impedances of this circuit at mid-band frequency.

Solution

Design of a fixed-bias BJT amplifier with a temperature stabilizing resistor at BJT's emitter.

Design a fixed-bias BJT amplifier having a temperature stabilizing resistor R_E so that its operating point is as shown in the IV graph. If only [commercially availble resistors] were used, how much would the Q-point deviate from the desired specification.

Solution:

Base-Emitter input impedance of the simple fixed-bias BJT amplifier seen by small signal input.

Show derivation of the AC resistance of the Base-Emitter junction (r_e) of the BJT circuit below in terms of emitter current. Proof that the input impedance Z_b at the Base seen by the input small signal I_b is βr_e.

Solution

Use of KVL to solve a diode circuit 30 October 2013 problem 2

Use KVL principle to find the current I and voltage V_o in the diode circuit below.

Solution:

Use of KVL to solve a diode circuit 30 October 2013 problem 1

Use KVL principle to find the current I_D and voltage V_o in the diode circuit below.

Solution:

Design of a fixed-bias BJT amplifer 29 October 2013

Design a fixed-bias BJT amplifier so that it operates as in the IV graph shown. If only [commercially available resistors] were used, how much would the Q-point deviate from desired specifications.

Solution

DC and AC analyses of a fixed-bias BJT amplifier 29 October 2013

Perform DC analysis of the fixed-bias BJT amplifier below to find the operating point of BJT. Calculate all related voltages and currents in the circuit. Use information obtained from DC analysis to further perform AC analysis to find the small signal voltage gain, input and output impedances of this circuit at mid-band frequency.

Solution

Finding a Q-point in I-V graph of a resistor with KVL October 2, 2013 problem 11

Use KVL to determine the Q-point of the 5 kOhm resistor in this circuit.

Solution:

Finding a Q-point in I-V graph of a resistor with KVL October 2, 2013 problem 12

Use KVL to determine the Q-point of the 10 kOhm resistor in this circuit.

Solution:

Solving a basic resistor circuit with KVL October 2, 2013 problem 10

Use KVL to determine the voltage at A and show the balance of powers in this circuit.

Solution:

Solving a basic resistor circuit with KVL October 2, 2013 problem 9

Use KVL to determine the voltage at A and show the balance of powers in this circuit.

Solution:

Finding a Q-point in I-V graph of a resistor with KVL October 2, 2013 problem 8

Use KVL to determine the Q-point of the 10 kOhm resistor in this circuit.

Solution:

Finding a Q-point in I-V graph of a resistor with KVL October 2, 2013 problem 7

Use KVL to determine the Q-point of the 5 kOhm resistor in this circuit.

Solution:



Solving a basic resistor circuit with KVL October 2, 2013 problem 6

Use KVL to determine the voltage at B and show the balance of powers in this circuit.

Solution:

Solving a basic resistor circuit with KVL October 2, 2013 problem 5

Use KVL to determine the voltage at B and show the balance of powers in this circuit.

Solution:

Finding a Q-point in I-V graph of a resistor with KVL October 2, 2013 problem 4

Use KVL to determine the Q-point of the 5 kOhm resistor in this circuit.


Solution:

Finding a Q-point in I-V graph of a resistor with KVL October 2, 2013 problem 3

Use KVL to determine the Q-point of the 10 kOhm resistor in this circuit.


Solution:



Solving a basic resistor circuit with KVL October 2, 2013 problem 2

Use KVL to determine the voltage at B and show the balance of powers in this circuit.

Solution:

Solving a basic resistor circuit with KVL October 2, 2013 problem 1

Use KVL to determine the voltage at A and show the balance of powers in this circuit.


Solution:

 

Voltage transfer characteristics of a resistor-transistor "NOR" gate circuit.

Draw a voltage transfer characteristics (VTC) Vout v.s. Vin of a resistor-transistor "NOR" gate circuit in the figure for  Vin in a range from 0 V to 5 V, given the voltage across forward-biased diode and transistor current gain being 0.7 V and 30, respectively.

 



 

Solution:

 



 

 

Voltage transfer characteristics of a diode-transistor "NAND" gate circuit.

Draw a voltage transfer characteristics (VTC) Vout v.s. Vin of a diode-transistor "NAND" gate circuit in the figure for  Vin in a range from 0 V to 5 V, given the voltage across forward-biased diode and transistor current gain being 0.7 V and 30, respectively.

 

Solution: