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ME3000 Analog Electronics
RF Class A Tuned Amplifiers
This courseware product contains scholarly and technical information and is protected by copyright
laws and international treaties. No part of this publication may be reproduced by any means, be it
transmitted, transcribed, photocopied, stored in a retrieval system, or translated into any language in
any form, without the prior written permission of Acehub Vista Sdn. Bhd.
The use of the courseware product and all other products developed and/or distributed by Acehub
Vista Sdn. Bhd. are subject to the applicable License Agreement.
For further information, see the Courseware Product License Agreement.
Objectives
i)
To demonstrate the practical issues of designing an RF tuned amplifier
ii)
To demonstrate AC measurements on a Class A amplifier
Equipment Required
i)
ME3000-M2 Analog Electronics Training Kit
ii)
Digital Multimeter, recommendation : Agilent 34405A or U2741A
iii)
50 MHz Oscilloscope or equivalent, recommendation : Agilent DSO1002A 60 MHz or
U2701A
iv)
10 MHz Function Generator or equivalent, recommendation : Agilent 33220A or U2761A
v)
Dual Output (+/- 12V, 0.5A) DC Power Supply, recommendation : Agilent E3631A
Accessories Required
i)
1 x 4-way power supply cable
ii)
1 x BNC(m)-to-grabber clips coaxial cable
iii)
6 x jumper cables terminated with grabber clips at both ends
iv)
1 x antistatic wrist strap
Caution:
An electrostatic discharge generated by a person or an object coming in contact with electrical
components may damage or destroy the training kit. To avoid the risk of electrostatic discharge,
please wear the antistatic wrist strap and observe the handling precautions and recommendations
contained in the EN100015-1 standard. Do not connect or disconnect the device while it is being
energized.
ME3000 Analog Electronics
Lab 6
http://dreamcatcher.asia/cw
Lab 6 - 1/19
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Summary of Contents for Dream Catcher ME3000 Analog Electronics Lab 6
- Page 1 http://dreamcatcher.asia/cw ______________________________________________________________________ ME3000 Analog Electronics Lab 6 RF Class A Tuned Amplifiers This courseware product contains scholarly and technical information and is protected by copyright laws and international treaties. No part of this publication may be reproduced by any means, be it transmitted, transcribed, photocopied, stored in a retrieval system, or translated into any language in any form, without the prior written permission of Acehub Vista Sdn.
- Page 2 http://dreamcatcher.asia/cw ______________________________________________________________________ Introduction A Class A transistor amplifier is biased so that the transistor conducts continuously. The transistor of the Class A amplifier is biased in the active region during the whole duration of operation. The Class A amplifier is a linear amplifier since the transistor operation in the active region is almost linear. Two types of amplifiers can be designed –...
- Page 3 http://dreamcatcher.asia/cw ______________________________________________________________________ Output Input Figure 3 – Typical Class A Tuned Amplifier Schematic Diagram A radio frequency (RF) amplifier is designed to operate in the RF region which normally refers to frequencies between 1 MHz to 300 MHz. Great care must be taken in designing an RF amplifier as most of the components will not portray ideal characteristics at radio frequencies.
- Page 4 http://dreamcatcher.asia/cw ______________________________________________________________________ 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.
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Page 5: Frequency Response
http://dreamcatcher.asia/cw ______________________________________________________________________ Frequency Response 11. Set the function generator output to 40 mVpp. 12. Connect the function generator output to TP1 and reference to GND using the BNC-to- grabber clips coaxial cable. 13. Connect the oscilloscope CH1 probe to TP1 and GND. 14. - Page 6 http://dreamcatcher.asia/cw ______________________________________________________________________ Voltage Gain Estimation 21. Unplug the jumpers from J28 and J29. = 470 by connecting jumpers to J30 and J31. 22. Set R 23. Set the function generator output to 40 mVpp and the output frequency to the resonance frequency value measured earlier.
- Page 7 http://dreamcatcher.asia/cw ______________________________________________________________________ Appendix: Tips on Using Agilent E3631A Triple Output DC Power Supply Supplying +5 V, +15 V, and 15 V to the ME3000-M1 training kit: Press Power to turn on the E3631A. The E3631A has three adjustable output supplies namely +6 V, +25 V, and 25 V. By default, all outputs are disabled (the OFF annunciator is turned on), the +6 V supply is selected, and the knob is ready for voltage control.
- Page 8 http://dreamcatcher.asia/cw ______________________________________________________________________ Appendix: Tips on How to Use the Agilent U2741A USB Modular Digital Multimeter Front Panel of the Agilent U2741A USB Modular Digital Multimeter Figure B-1 – Front Panel of the Digital Multimeter Setting Up the Connection 1. Connect the digital multimeter to the PC using a USB cable. 2.
- Page 9 http://dreamcatcher.asia/cw ______________________________________________________________________ 2. Make the connection as shown in Figure B-2 in order to measure DC voltage. You can control the U2741A via the Agilent Measurement Manager (AMM) software for U2741A or via SCPI commands sent through the USB interface from your own application programs. Figure B-2 –...
- Page 10 http://dreamcatcher.asia/cw ______________________________________________________________________ Appendix: Tips on How to Use the Agilent U2761A USB Modular Function Generator Front Panel of the Agilent U2761A USB Modular Function Generator Figure A-1 – Front Panel of the U2761A Setup Connection 9. Connect the function generator to the PC using a USB cable. 10.
- Page 11 http://dreamcatcher.asia/cw ______________________________________________________________________ Agilent Measurement Manager Soft Front Panel (Function Generator) Figure A-2 – Graphic User Interface of the Agilent Measurement Manager (Function Generator) Figure A-2 shows the graphic user interface of the Agilent Modular Function Generator under the Agilent Measurement Manager (AMM). Table A- shows the features of each panel of the interface. Table A-2 –...
- Page 12 http://dreamcatcher.asia/cw ______________________________________________________________________ Function Limitation If you change to a function where the maximum frequency is less than the current function, the frequency will be adjusted to the maximum value for the new function. For example, if you are currently outputting a 20 MHz sine wave and then change to the Ramp function, the U2761A will automatically adjust the output frequency to 200 kHz (the upper limit for Ramp).
- Page 13 http://dreamcatcher.asia/cw ______________________________________________________________________ value will double to 10 V . If you change from high impedance to 50 Ω, the displayed amplitude value will drop to half. You cannot specify the output amplitude in dBm if the output termination is currently set to high impedance.
- Page 14 http://dreamcatcher.asia/cw ______________________________________________________________________ Appendix: Tips on How to Use the Agilent U2701A USB Modular Oscilloscope Front Panel of the Agilent U2701A USB Modular Oscilloscope Figure B-1 – Front Panel of the U2701A Setup Connection 1. Connect the oscilloscope to the PC using a USB cable. 2.
- Page 15 http://dreamcatcher.asia/cw ______________________________________________________________________ Agilent Measurement Manager Soft Front Panel (Oscilloscope) Figure B-35 – Soft Front Panel of the Oscilloscope Figure B-35B-3 shows the graphic user interface of Agilent Modular Oscilloscope under Agilent Measurement Manager together with the label of each panel. Table B-1B-1 shows the features of each panel of the interface.
- Page 16 http://dreamcatcher.asia/cw ______________________________________________________________________ The analog control panel of the interface consists of a vertical control and a horizontal control that are used to control and set the waveform of the graph display. The vertical control is used to change the vertical scale and position of the waveform. The soft front panel of the vertical system control is shown in Figure .
- Page 17 http://dreamcatcher.asia/cw ______________________________________________________________________ 6. You can also configure the offset of the oscilloscope by using the offset control as shown in Figure . The offset is used to configure the position of the ground relative to the center of the display. Figure B-7 –...
- Page 18 http://dreamcatcher.asia/cw ______________________________________________________________________ Figure B-10 – Soft Front Panel of the Delay Control and Trigger Point 13. You may click to increase or decrease the delay time. 14. The oscilloscope offers three types of horizontal mode functions, which are Main Mode, Roll Mode, and XY Mode.
- Page 19 http://dreamcatcher.asia/cw ______________________________________________________________________ Figure B-12 – Cursor Controls 8. X Cursors places two cursors on the X-Axis of the waveforms to measure the time difference between the two cursors (X2 minus X1). Delta X denotes the time difference. 9. Y Cursors places two cursors on the Y-Axis of the waveforms to measure the voltage difference between the two cursors (Y2 minus Y1).
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