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

Design a fixed-bias BJT amplifier having a temperature stabilizing resistor R_E and a negative power supply 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:

DC and AC analysis of a fixed base-voltage BJT amplifier with a temperature stabilizing resistor at BJT's emitter.

Find the Q-point of a fixed base-voltage BJT amplifier having a temperature stabilizing resistor R_E. Also find related currents and voltages.

Solution

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

Design a fixed base-voltage 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 specifications.

Solution

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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

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