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アンプ Dream Catcher ME3000 Analog Electronics Lab 6のPDF マニュアルをオンラインで閲覧またはダウンロードできます。Dream Catcher ME3000 Analog Electronics Lab 6 19 ページ。 Rf class a tuned amplifiers
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2.
DC Biasing
1. Locate the Class A Tuned Amplifier section on the ME3000-M1 training kit.
2. Disconnect all the jumpers located in the Class A Tuned Amplifier section.
3. Construct an RF Class A amplifier circuit shown in Figure 4 by connecting jumpers to J28 and
J29.
4. Connect the power supply to the training kit using the 4-way power supply cable. Set the
power supply voltage to +15 V. Turn on the power supply. Refer to Appendix for details.
5. Use the multimeter to measure V
GND). Calculate the voltage at the transistor base using the resistive voltage divider formula,
R
17
V
B
R
R
16
17
transistor emitter, V
6. Measure V
(at TP2 and GND), V
C
transistor C, B, E pins.
7. Verify that V
– V
B
8. Check if the calculated V
9. Estimate I
using
C
10. Determine the transconductance, gm of the transistor at T = 25 using
Input
Figure 4 – Schematic Diagram of DC Biasing on an RF Class A Amplifier
ME3000 Analog Electronics
applied to the transistor (between terminals TP4 and
CC
V
, where R17 = 4.7k and R16 = 10k. Then, calculate the voltage at the
CC
using V
= V
– 0.7.
E
E
B
(at TP3 and GND), and V
B
≈ 0.7 V.
E
and V
values agree with the measured values.
B
E
V
I
I
E
, where R
C
E
R
E
R16
C6
R17
(at TP5 and GND) on the
E
= R18 = 150 .
E
Vcc
C7
L1
C8
Q3
C10
R18
http://dreamcatcher.asia/cw
I
(mA
)
g
C
.
m
26
Output
R19
Lab 6 - 4/19