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// RF Transceiver Design Condensed 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 7 th 2007 10:00-11:15 lecture 1 Systems, specs Technologies & FOMS Architectures + finding subblock parameters 11:15-12:00 instruction 1 12:00-13:00 lunch 13:00-14:15 lecture 2 Amplifiers & Mixers 14:15-15:30 instruction 2 15:30-16:30 lecture 3 Oscillators & Filters 16:30-17:00 instruction 3

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// Agenda Day 2: Friday June 8 th 2007 9:00-10:15 lecture 4 Block interaction: –substrate xtalk –coupling of inductors –Packaging –thermal effects –multi-mode –non-linear input/output impedance 10:15-11:00 instruction 4 11:00-12:00 lecture 5 Multiple-antenna OFDM systems: overview, system build-up, digital signal processing 12:00-13:00 lunch 13:00-14:00 lecture 6 Influence and digital compensation of Phase Noise and Carrier frequency offset 14:00-14:30 instruction 14:30-15:30 lecture 7 Influence and digital compensation of IQ imbalance and nonlinearities, generalized error model 15:30-16:00 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= GTX=0dB Wavelength=0.12m PTX =0.11mW Low power! Cheap AA NiCd battery: 1.5Wh => 14000 hr!

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// Question: -10 dBm frequency 2 -40 dBm P out 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 ω1ω1 ω2ω2

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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!) P fund,out ΔP frequency P out (dBm) 2

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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) P fund,out ΔP freq. P out (dBm) 2

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// RX NF Exercise: Calculate RX minimum NF for: Psensitivity = -70dBm BW = 20MHz SNRmin=15dB

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// RX NF Solution: P RX =-70dBm BW=20MHz SNR min 15dB Equivalent input noise: -85dBm Equivalent input noise density: -158dBm/Hz Thermal noise density (kT) : -174dBm/Hz Total transceiver NF=16dB 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 >=2Msps Resolution: max signal = -20dBm min signal = -70dBm equivalent input noise = -81dBm equivalent ADC input noise = -91dBm Dyn range: 71dB Effective resolution: >= 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 doesn’t work

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// Lecture #4: Why it still doesn’t 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 !

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