RF Transceiver Design Condensed course for 3TU students

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RF Transceiver DesignCondensed course for 3TU
students

• Peter Baltus
• Eindhoven University of Technology
• Department of Electrical Engineering
• 20070607 / 20070608

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Agenda Day 1 Thursday June 7th 2007

• 1000-1115 lecture 1
• Systems, specs
• Technologies FOMS
• Architectures finding subblock parameters
• 1115-1200 instruction 1
• 1200-1300 lunch
• 1300-1415 lecture 2
• Amplifiers Mixers
• 1415-1530 instruction 2
• 1530-1630 lecture 3
• Oscillators Filters
• 1630-1700 instruction 3

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Agenda Day 2 Friday June 8th 2007

• 900-1015 lecture 4
• Block interaction
• substrate xtalk
• coupling of inductors
• Packaging
• thermal effects
• multi-mode
• non-linear input/output impedance
• 1015-1100 instruction 4
• 1100-1200 lecture 5
• Multiple-antenna OFDM systems overview, system
  build-up, digital signal processing
• 1200-1300 lunch
• 1300-1400 lecture 6
• Influence and digital compensation of Phase Noise
  and Carrier frequency offset
• 1400-1430 instruction
• 1430-1530 lecture 7
• Influence and digital compensation of IQ
  imbalance and nonlinearities, generalized error
  model
• 1530-1600 instruction

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Lecture 1 RF Systems Specifications
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Instruction
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Question 1

• Design a simple mass-market WLAN system
• - f 5..6GHz - BW 20MHz
• - SNRmin 11dB
• - Range 100m LOS
• Find a consistent (but not unique) set of
  parameters
• - Transmit power
• - Receive noise figure
• - Receiver IP3
• - Receiver selectivity
• Make any reasonable assumption required

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Question

• Calculate required transmit power if
• Frequency 2.5GHz
• range 10m
• sensitivity -70dBm
• omnidirectional antennas
• LOS

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Solution

• PRX-70dBm
• GRX GTX0dB
• Wavelength0.12m
• PTX 0.11mW
• Low power!
• Cheap AA NiCd battery 1.5Wh gt 14000 hr!

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Question
-10 dBm
Pout
-40 dBm
frequency
2
What is IIP2 and OIP2 assuming a power gain of 7
dB
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Two signals at the input of a non-linear system
Yield a lot! of other frequency components
?1
?2
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A forest of frequencies
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Graphical overview of inter-modulation products
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Calculation of IP2
IIP2 input power where wanted power second
order power (extrapolated point).
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Formula for OIP2 (small signal extrapolation!)
Pfund,out
Pout
?P
frequency
2
(dBm)
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Answer
The input IIP2 is OIP2 divided by the power gain
(so -7 dB)
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Calculation of IP3
IIP3 input power where wanted power the third
order power(extrapolated point).
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Formula for OIP3 (when not in compression)
Pfund,out
Pout
?P
freq.
2
(dBm)
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RX NF

• Exercise
• Calculate RX minimum NF for
• Psensitivity -70dBm
• BW 20MHz
• SNRmin15dB

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RX NF

• Solution
• PRX-70dBm
• BW20MHz
• SNRmin 15dB
• Equivalent input noise -85dBm
• Equivalent input noise density-158dBm/Hz
• Thermal noise density (kT) -174dBm/Hz
• Total transceiver NF16dB
• Note need to include losses for antenna filter,
  switches, antenna loss (total e.g. 3dB) and
  baseband implementation loss to get RX IC NF

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RX ADC

• Exercise
• Bandwidth 1MHz
• max signal -20dBm
• min signal -70dBm
• SNRmin 11dB
• Calculate ADC minimum sampling rate minimum
  bits assuming perfect analog channel selectivity
  but no AGC, and ADC noise contribution less than
  1dB

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RX ADC

• Solution
• Bandwidth 1MHz, sample rate gt2Msps
• Resolution
• max signal -20dBm
• min signal -70dBm
• equivalent input noise -81dBm
• equivalent ADC input noise -91dBm
• Dyn range 71dB
• Effective resolution gt 12bit

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Lecture 2 Amplifiers Mixers
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Instruction
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Question 1

• For a simple mass-market WLAN system
• - select a (very simple) LNA topology
• - identify main performance parameters
• - choose typical/common sense values
• - set approximate values for components
• - draw an approximate layout of the IC
• - identify potentially relevant parasitic
  elements

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Question 2

• For a simple mass-market WLAN system
• - select a (very simple) Mixer topology
• - identify main performance parameters
• - choose typical/common sense values
• - set approximate values for components
• - draw an approximate layout of the IC
• - identify potentially relevant parasitic
  elements

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Lecture 3 VCOs and Filters
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Instruction
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Question 1

• For a simple mass-market WLAN system
• - select a (very simple) VCO topology
• - identify main performance parameters
• - choose typical/common sense values
• - set approximate values for components
• - draw an approximate layout of the IC
• - identify potentially relevant parasitic
  elements

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Question 2

• For a simple mass-market WLAN system
• - select a (very simple) IF filter topology
• - identify main performance parameters
• - choose typical/common sense values
• - set approximate values for components
• - draw an approximate layout of the IC
• - identify potentially relevant parasitic
  elements

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The End

• for today!
• Thanks for your attention !
• Tomorrow
• Block interaction
• or
• Why it still doesnt work ?

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Lecture 4 Why it still doesnt work ?
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Instruction
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Question

• Design
• Floorplan
• Pin-out
• For a 4x4 MIMO WLAN transceiver for the
  mass-market

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The End

• for my contribution today
• Thanks for your attention !