Thomas B. Cho, UC Berkeley 1 A Multi-Standard Monolithic CMOS RF Transceiver Thomas Cho, Jacques Rudell, Jeff Ou, Todd Weigandt, Sekhar Narayanaswami, Srenik Mehta, George Chien, Carrol Barrett, Francesco Brianti*, and Prof. Paul Gray. University of California, Berkeley *SGS Thomson
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
Thomas B. Cho, UC Berkeley 1
A Multi-Standard MonolithicCMOS RF Transceiver
Thomas Cho, Jacques Rudell, Jeff Ou,Todd Weigandt, Sekhar Narayanaswami,
Srenik Mehta, George Chien,Carrol Barrett, Francesco Brianti*,
and Prof. Paul Gray.
University of California, Berkeley*SGS Thomson
Thomas B. Cho, UC Berkeley 2
. Background/Motivation. A monolithic CMOS RF transceiver. Design considerations. Key building blocks. Future plan
Outline
Thomas B. Cho, UC Berkeley 3
Next Step:Multi-Standard, Adaptive Modes of Communication
Low Power Terminal Design
• Architecture Optimization
• Low-Power RF Design
• Low-Power ADC/DAC
• Low-Power Digital and DSP
• Power-Optimized Display
• Etc
BATTERY(40+ lbs)
Thomas B. Cho, UC Berkeley 4
Overall Objective
Single RF Modem with interface capability to:. Public Cellular Network. Cordless Phones/PBXs. Wireless LANs. Other emerging PCS Systems
Focus of this research:.What are the important technical problemsfrom the perspective of the RF modemdesign?
Thomas B. Cho, UC Berkeley 5
BATTERY(40+ lbs)
Adaptive, Multistandard RF Modems
Thomas B. Cho, UC Berkeley 6
Motivation
Design Goal:. Radio transceiver for personalcommunications.
Design Objectives:. Low power consumption. Low cost implementation. Multi-Standard capability
Thomas B. Cho, UC Berkeley 7
Research Goals
. Single-chip implementation
Integrate both RF & Baseband circuits on the samechip
Eliminate off-chip high frequency signal paths toreduce off-chip components for low power, lowcost & smaller form factors(ext. LC-tank, ext. IF BPF, ..)
Baseband digital signal processing for programma-ble multistandard capability. CMOS technology
High integration and low cost
Thomas B. Cho, UC Berkeley 8
Conventional Approach
90
ADC
ADC
VCOVCO
RF LNA/Mixer65 mW
IF AGC60 mW
IF Mixer45 mW
40 mW
50mW
250mW per ADC
I
Q
DAC
DAC
90
VCO
40 mWModulator165 mW
I
Q
20 mW per DAC
Transmitter
Receiver
A typical exampleof RF Transceiver
Thomas B. Cho, UC Berkeley 9
Our Approach
.Using DECT standard as a vehicle tostudy various problems/issues
Thomas B. Cho, UC Berkeley 10
A Quasi-Direct Conversion Approach
Jeff OuJacques Rudell
Todd WeigandtSrenik MehtaCarol Barrett
Thomas ChoGeorge Chien
Thomas Cho
I
Q
Francesco Brianti
DSPADC
Sekhar Narayanaswami
LPF DAC
FrequencySynthesizer
Data
Jacques Rudell
Thomas B. Cho, UC Berkeley 11
Receiver Path (DECT)
1.88 - 1.9G
280M
1.6G1.30 - 1.32G
BPF
BPF
LO 1
LO 2LO 1
LO 2
Single RC
Image
300M
1.728M
f
f
f
f
f
LPF1
LPF2
1.728M
ADC
Desired Signal
Thomas B. Cho, UC Berkeley 12
Transmitter Path (DECT)
Data
PowerAmplifier
BPF &Antenna
To
FrequencySynthesizer
LPF DAC
.Power Amplifier(PA) design is near completion..Transmitter architecture still in early research phase
Under Research
Thomas B. Cho, UC Berkeley 13
What’s different?
A Quasi-Direct Conversion Receiver. No external IF BPF => Little or No IF Filtering => Selective filtering at Baseband. Two Local Osc. freq’s.
LO1 : a fixed freq. osc LO2 : a tuned osc to the desired channel
=> Elimination of carrier feedthroughcompared to direct conversion arch.
=> Relaxed phase noise requirement on LO 2(tuned osc).
Thomas B. Cho, UC Berkeley 14
Design Challenges. System:
- Data recovery in the presence of strong interferersand noise w/o ext. IF filters!
. A two-stage differential-mode amplifier. On-chip spiral inductors for tuning out gatecapacitance and output impedance matching. Require power control