1. Development of an UWB CMOS Transmitter-Antenna Module
Meng Miao and Cam Nguyen
Department of Electrical and Computer Engineering
Texas A&M University
College Station, Texas
Applicable Notes

2. Outline Introduction UWB tunable CMOS RFIC transmitter UWB antenna
Integrated CMOS transmitter-antenna
Summary
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3. Introduction
UWB techniques promising for wireless communications, sensor and radar
- Extremely low-power spectral densities across an ultra- wide band spectrum
- Extremely small interference to other radio signals with excellent immunity to interference from these signals
- Less multi-path problems
- Fine resolution and locating precision
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4. Introduction
 UWB impulse (or carrier-less) radar and communication systems
- UWB impulse transmitters (impulse, monocycle)
- UWB antennas
 Compact, low-cost, simple UWB transmitters
 Seamless integration with antennas
 CMOS RFICs for low cost, low power consumption, and easy integration with digital ICs for commercial UWB systems
Outline the high points of the presentation you are giving. Don’t include the title or conclusion in your outline. You should state the purpose of the work described in your paper. Describe the big picture of why you did the work, not the detailed technical objectives your work accomplished.
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5. UWB Tunable CMOS RFIC Transmitter
pulse generator is essential component in both transmitters and receivers of UWB impulse systems
- Impulse pulse (large DC and low-frequency components)
- Monocycle pulse (no DC components, facilitating transmission through antennas)
 Tunable TX transmits both narrow and wide pulses
- enhanced range and resolution
- flexibility in operations and applications
- enhanced ability in communications, sensing and radar
- optimization for circuit, system and environment variations for different applications
Outline the high points of the presentation you are giving. Don’t include the title or conclusion in your outline. You should state the purpose of the work described in your paper. Describe the big picture of why you did the work, not the detailed technical objectives your work accomplished.
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6. UWB Tunable CMOS RFIC Transmitter
 impulse and monocycle pulse waveforms
monocycle pulse attractive due to its band-limit 1 2 3 4 5 6 7 8 -1
-0.8
-0.6
-0.4
-0.2
0.2
0.4
0.6
0.8
Time (ns)
Voltage (V)
Impulse
Monocycle pulse 1 2 3 4 5 6 7
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
Frequency (GHz)
Normalized magnitude
Impulse
Monocycle pulse
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7. UWB Tunable CMOS RFIC Transmitter
Integrated tunable pulse generator components:
Tuning delay circuit
- Shunt-capacitor delay element
Square wave generator
- Inverter series
Impulse-forming circuit
- NOR block
Pulse-shaping circuit
- High pass filter
Outline the high points of the presentation you are giving. Don’t include the title or conclusion in your outline. You should state the purpose of the work described in your paper. Describe the big picture of why you did the work, not the detailed technical objectives your work accomplished.
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8. UWB Tunable CMOS RFIC Transmitter
Block Diagram
NOR
impulse
forming
Tunable
delay cell
Reference
cell
square wave
generation A B
tuning
delay
pulse
shaping C D
output
out in M1 M2 V
ctrl dd
tunable delay cell reference cell
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9. UWB Tunable CMOS RFIC Transmitter
NOR
Tunable
delay cell
Reference
cell A B C D
waveform generated at each node
A: square with tunable delay time.
B: square with fixed delay time.
C: narrow impulse-like signal with tunable pulse duration and fixed falling edge.
D: monocycle pulse signal with tunable pulse duration A B C D
tunable
delay
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10. UWB Tunable CMOS RFIC Transmitter
CMOS chip
TSMC 0.25-µm
process.
die size: 300 µm X
250 µm.
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11. UWB Tunable CMOS RFIC Transmitter
Impulse Generation (50- load)
1500
2000
2500
3000
3500
-0.2
0.2
0.4
0.6
0.8 1
1.2
1.4
Time (ps)
Output Voltage (V)
measured
simulation
10 MHz input clock signal.
peak-to-peak voltage: 0.5 – 1.3 V.
tunable pulse duration: 100 – 300 ps.
gate control voltage (tunable delay cell): – Vdd.
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12. UWB Tunable CMOS RFIC Transmitter
Monocycle Pulse Generation (50- load)
1000
1500
2000
2500
3000
-0.5
-0.4
-0.3
-0.2
-0.1
0.1
0.2
0.3
0.4
0.5
Time (ps)
Output Voltage (V) 2 4 6 8 10 12
-80
-75
-70
-65
-60
-55
-50
-45
-40
Freq. (GHz)
Power (dBm)
140-ps pulse
peak-to-peak voltage: 0.3 – 0.6 V
tunable pulse duration: 140 – 350 ps
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13. UWB Antenna
Dictate the transmitted and received pulse shape and amplitude
Should have good impulse response with minimal distortion
Compact uniplanar structure to facilitate integration with the designed CMOS chip
Outline the high points of the presentation you are giving. Don’t include the title or conclusion in your outline. You should state the purpose of the work described in your paper. Describe the big picture of why you did the work, not the detailed technical objectives your work accomplished.
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14. UWB Antenna 0.025 in. RT/duroid 6010 substrate antenna aperture size:4 6 8 10 12
-40
-35
-30
-25
-20
-15
-10 -5
Freq. (GHz)
Return Loss (dB)
Measured
Simulation
0.025 in. RT/duroid 6010
substrate
antenna aperture size:
1.2 in. X 1.4 in.
measured return loss < -12 dB (3.1–10.6 GHz)
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15. UWB Antenna TDR response 50-ps input impulse
0.5 1
1.5 2
2.5
0.2
0.4
0.6
0.8
Time (ns)
TDR Response
Measured
Simulation
50-ps input impulse
0–0.5 ns response corresponding SMA connector and CPW feed
0.5 ns+ response of antenna.
18-dB measured return loss
input impulse
SMA response
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16. Integrated CMOS Transmitter-Antenna
10-MHz clock signal
CMOS chip- antenna
integration
antenna
quasi-microstrip
power divider
digitizing
oscilloscope In
Trig
CMOS
transmitter chip
UWB transmit module
pulse transmission
tests
10-MHz clock signal
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17. Integrated CMOS Transmitter-Antenna
Pulse Transmission Tests
500
1000
1500
2000
2500
3000
-25
-20
-15
-10 -5 5 10 15 20 25
Time (ps)
Voltage (mV)
transmitted tunable impulses by TX
received mono-
cycle pulses with tunable pulse duration from
160–350 ps
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18. Integrated CMOS Transmitter-Antenna
Pulse Transmission Tests
500
1000
1500
2000
2500
3000
-15
-10 -5 5 10 15
Time (ps)
Voltage (mV)
transmitted
monocycle
pulses by TX
received mono-
cycle pulse’s
first derivatives
with tunable
duration.
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19. Summary
CMOS-based tunable transmitter-antenna module for UWB impulse systems
Low cost, low power
Fully integration
Tunable impulse and monocycle pulse
Fine resolution and locating precision
Applications in UWB communication systems, sensors, and radars
Outline the high points of the presentation you are giving. Don’t include the title or conclusion in your outline. You should state the purpose of the work described in your paper. Describe the big picture of why you did the work, not the detailed technical objectives your work accomplished.
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20. Acknowledgement
This work was supported in part by the National Science Foundation.
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