Revision of the ADC/DAC Board for NIJ Public Safety Radio S.M. Shajedul Hasan * and S.W. Ellingson July 22, 2008 Contents 1 Introduction 2 2 Revised Design 2 3 Summary 3 A Bill of Materials 7 B Schematic 11 C Layout 16 * Bradley Dept. of Electrical & Computer Engineering, 432 Durham Hall, Virginia Polytechnic Institute & State University, Blacksburg, VA 24061 USA. E-mail: [email protected]1
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Revision of the ADC/DAC Board for NIJ Public Safety Radio · Revision of the ADC/DAC Board for NIJ Public Safety Radio S.M. Shajedul Hasan∗ and S.W. Ellingson July 22, 2008 Contents
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Revision of the ADC/DAC Board for NIJ Public
Safety Radio
S.M. Shajedul Hasan∗ and S.W. Ellingson
July 22, 2008
Contents
1 Introduction 2
2 Revised Design 2
3 Summary 3
A Bill of Materials 7
B Schematic 11
C Layout 16
∗Bradley Dept. of Electrical & Computer Engineering, 432 Durham Hall, Virginia Polytechnic Institute& State University, Blacksburg, VA 24061 USA. E-mail: [email protected]
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1 Introduction
In [1], we presented the design and development of an ADC/DAC evaluation board for NIJpublic safety radio. This board was developed under multi-band/multi-mode radio (MMR)project in Virginia Tech sponsored by the U.S. Department of Justice [2]. A prototype radiowas built using this ADC/DAC board to demonstrate the basic functionality of our desiredMMR [3]. After the successful integration of the first prototype we planned to build a an-other prototype MMR, which will be more compact and will have less cable connections.Hence, we revised our first version of ADC/DAC board. This report presents the overalldescription of the revised ADC/DAC board. The image of this board is shown in Figure 1.
Figure 1: Image of ADC/DAC board.
This report is organized as follows. Section 2 presents the summary of the changes wemade from the previous version of RFIC. Section 3 concludes the report presenting the totalcost. Finally, three appendices present the bill of materials, complete schematic and layoutimages.
2 Revised Design
The following changes have been made in this revised RFIC board:
• Removed all the power jumpers
• Added MMCX ganged connectors
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• Revised power supply circuits
• Added synthesizer circuits
Table 1 present all the input/output ports of the revised RFIC board.
Function Port Name Conn. Name CharacteristicsDAC Output IB J8-A Differential Output
IA J8-B of I-ChannelQB J8-C Differential OutputQA J8-D of Q-Channel
ADC Input IA J24-A Differential InputIB J24-B of I-ChannelQB J24-C Differential InputQA J24-D of Q-Channel
A summary of the cost for one ADC/DAC board is given in Table 2. Since we prepared justtwo boards for the present study using the quickest manufacturing time, the PCB fabricationand assembly cost is not representative of the cost to build the same device in large quantities.
Table 2: Summary of the cost for one ADC/DAC board.
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References
[1] S.M. Hasan and S.W. Ellingson, “Design and Development of an ADC/DAC Evalua-tion Board for NIJ Public Safety Radio,” Virginia Tech, VA, Tech. Rep. 24, Nov. 2007.[Online]. Available: http://www.ece.vt.edu/swe/chamrad/.
[2] NIJ project web site, http://www.ece.vt.edu/swe/chamrad/.
[3] S.W. Ellingson and S.M. Hasan, “Multiband/Multimode Radio” (presentation slides),NIJ CommTech PI Meeting, Arlington, VA, October 24, 2007
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Appendices
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A Bill of Materials
This section presents the bill of materials.
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Bill of Materials
NIJ ADC_DAC Board, Ver. 2.0
MPRG/Virginia Tech
Prepared By: S.M. Hasan, Date: FEB 20, 2008
Item Qty Reference Part Name Package Manufacturer Manufacturer Part# Distributor Distributor Part# Description