Radio Design, Final Project 2005
Due: TBD (12:00 Tues May 10) in class.
We will use the final class time to resolve any last-minute problems.
This project is to be done in groups of 2 or 3, or independently,
without collaboration between groups. If you wish to be assigned to a group,
let me know at the beginning of the first class when the project is assigned.
Design a full duplex (FDD, Freq. Division Duplex)
(see cell phone standards at
radio system in the PCS 1900 band with the folowing
specifications. Where a specification cannot be met, provide
justification. Design objectives: 1) low cost, 2) meet specs,
3) low power, 4) small size. Where a price is not given on a vendor
web-page, assume $5 each (use the lowest prices, i.e., the prices
for largest quantity -- note all minicircuits parts have prices).
- Frequency band:
Transmit: 1850-1910 MHz, Receive: 1930-1990 MHz
Set the LO's for 1880 transmit, 1960 receive
- Channel Bandwidth: 1.25 MHz
Adjacent channel rejection (at Fc +/- 1.25 MHz): 60 dB
- Receiver noise figure: 10 dB
- Receiver sensitivity: TBD dBm at 10 dB S/N
- Receiver gain control: 30 dB
- Receiver output level: 1 V RMS at minimum input signal power
(i.e., at receiver sensitivity). This output is
at the final IF frequency. A demodulator is NOT
- Transmitter power: +24 dBm 1 dB compression
- Transmitter/receiver isolation
(at first receiver amplifier input at TX frequency): 60 dB
- Transmitter output noise floor
(at at receive frequency): 10 dB below receiver input noise floor
- receiver LO radiation: -80 dBm
- Receiver front end spur free dyn range: 70 dB
- Transmitter power control: 30 dB
- The transmitter and receiver share a single antenna through duplexer
- Transmitter/receiver physical size: TBD, X by Y centimeters
- Cost: $25
- High frequency filters:
Murata filters and duplexers
- Final IF filters :
Use ONLY: Sawtek SAW filters with appropriate bandwidth
Note: for filters, if the compression and OIP3 are not stated then set
P1dB=max power for the filter, and OIP3 12 dB above max power
- Transmit power amplifier:
Use ONLY: RF microdevices RF 2146
- Transmit modulator:
Use ONLY: RF microdevices RF 2422
This is a direct modulation system; you may assume that
the modulation signals on I and Q are the full 2.0
volts peak-peak as specified on the spec sheet.
Use ONLY: Minicircuits level 7 surface mount mixers
Make sure that the RF, IF, and LO frequency ranges
are correct in whatever model you choose.
- Amplifiers (except as above):
Use ONLY: Minicircuits surface mount amplifiers
- Oscillators :
Use ONLY: Minicircuits surface mount oscillators
You may use voltage-controlled oscillators, and assume
a suitable external synthesizer loop sets the frequency.
- Variable attenuator for power/gain control:
Use ONLY: M/A-COM part number AT-110
or try here:
Project Final Report
- All reports must be submitted in
MSword and pdf format electronically,
NO PAPER/HARDCOPY REPORTS WILL BE ACCEPTED.
- Maximum length: 15 pages single-spaced as outlined below
DO NOT EXCEED THIS LIMIT
YOU MUST FOLLOW THIS FORMAT EXACTLY
- Page 1: Cover Page
- Page 2: Abstract (1/2 page) Introduction (1/2 page)
- Page 3: System block diagram description:
Describe the transmitter and receiver block diagrams,
make sure to describe what each block is, and IF frequencies, etc.
- System block diagram 2 pages:
Page 4: transmitter block diagram
Page 5: receiver block diagram
- Page 6: Cascade analysis description:
1/2 page: describe the receiver cascade spreadsheet
1/2 page: describe the transmitter cascade spreadsheet
- Cascade analysis spreadsheets:
VENDOR NAME AND VENDOR
PART NUMBERS MUST BE ON THE SPREADSHEET
Page 7: receiver cascade analysis spreadsheet
Page 8: transmitter cascade analysis spreadsheet
- Page 9: Frequency plan :
1/3 page: description of frequency plan figures
1/3 page: transmitter frequency plan figures
1/3 page: receiver frequency plan figures
- Perform a sweep of the receiver as in the Agilent ADS example given in
project 3. For this, approximate the Duplexer, RF, and IF filters
by elliptic filters that resemble the transfer characteristics of
the filters you have chosen (set the stopband to approximate the filters).
Turn in the schematic and the frequency response sweep of your receiver.
(2 pages: 1 for schematic, 1 for freq response).
Page 10: ADS receiver schematic
Page 11: plots of both the passband
and image rejection (as 2 separate frequency sweeps as in the ADS example).
Make the sweep approximately 5 times as wide as the passband,
and sufficient to show selectivity of the radio.
- Page 12: Other calculations:
Make a 3-column table,
with the name of each spec in
column 1, the formula in column 2, and the answer in column 3.
Put the above results in one table !!!
- Page 13: Supporting calculations for the table
- Page 14: Rough physical layout of transmitter and receiver showing
location of all parts at 1:1 scale
- Page 15: Parts list icluding vendor, part number, quantity, and cost.
Hyperlink specs for all parts used !!!
- Do not forget to include the LO frequencies on the
system block diagrams
Problem resolution. If you have difficulties with your group,
follow these guidelines.