transistor is biased
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
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- For the circuit in Figure 1, the transistor is biased so that ICQ is 10 mA and VCEQ is 8 V. As a starting point, let VRE be 20% of VCC. Calculate the values needed for RE and RC.Assume β is 100. Select the nearest standard values for the two
Calculate the values of R1 and R2
![12:55
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You will recall from your study of BJT amplifiers that each transistor must be biased so that
they will be operating in the active (linear) region. If this step is omitted, the output signal will
be distorted. In this experiment, you will see how the selection of the bias network components
directly affects the accuracy and stability of the bias point against component tolerances and
transistor parameter variations.
PRELIMARY
For the circuit in Figure 1, the transistor is biased so that Ica is 10 mA and VCEQ is 8 V. As
a starting point, let Vre be 20% of Vcc. Calculate the values needed for Re and Rc.
Assume B is 100. Select the nearest standard values for the two resistors.
1.
VRc=
Rc =
VRe=
le =
Re=
Vcc=20V
KVL
Ice
Rc
Ico
R1
Saturation point
VCEQ
Quiescent point
2N3904
· RE
VCEO
R2
Load line
Cut off point
Figure 1: The basic biasing circuit for the BJT amplifier.
2. Referring to Figure 2, set Rih to
(B+1)
Rp and calculate the values of R1 and R2.
10
Figure 2: The equivalent circuit of the input bias circuit.
Rth =
Ith or Ib=
Vth =
R1 =
R2 =
3. Repeat the above procedure, except design for VRE = 40% Vcc. This will be design#2.
3-1:
Vcc=20V](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F701a4ba7-13d2-4542-a766-9dabc637ee0e%2Fe2302b87-5f92-4e80-8278-2b013f5abde6%2Fsyr6lbk_processed.png&w=3840&q=75)
Transcribed Image Text:12:55
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You will recall from your study of BJT amplifiers that each transistor must be biased so that
they will be operating in the active (linear) region. If this step is omitted, the output signal will
be distorted. In this experiment, you will see how the selection of the bias network components
directly affects the accuracy and stability of the bias point against component tolerances and
transistor parameter variations.
PRELIMARY
For the circuit in Figure 1, the transistor is biased so that Ica is 10 mA and VCEQ is 8 V. As
a starting point, let Vre be 20% of Vcc. Calculate the values needed for Re and Rc.
Assume B is 100. Select the nearest standard values for the two resistors.
1.
VRc=
Rc =
VRe=
le =
Re=
Vcc=20V
KVL
Ice
Rc
Ico
R1
Saturation point
VCEQ
Quiescent point
2N3904
· RE
VCEO
R2
Load line
Cut off point
Figure 1: The basic biasing circuit for the BJT amplifier.
2. Referring to Figure 2, set Rih to
(B+1)
Rp and calculate the values of R1 and R2.
10
Figure 2: The equivalent circuit of the input bias circuit.
Rth =
Ith or Ib=
Vth =
R1 =
R2 =
3. Repeat the above procedure, except design for VRE = 40% Vcc. This will be design#2.
3-1:
Vcc=20V
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