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Reconfigurable Ultra Low Power LNA for 2.4GHz Wireless Sensor Networks. TarisT., Mabrouki A., Kraïmia H., Deval Y., Begueret J-B. Bordeaux, France . OUTLINE. Context RF Front End Specifications Circuit design Conclusion & Perspectives. OUTLINE. Context RF Front End Specifications

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slide1
Reconfigurable Ultra Low Power LNA for 2.4GHz Wireless Sensor Networks

TarisT., Mabrouki A., Kraïmia H., Deval Y., Begueret J-B.

Bordeaux, France

outline
OUTLINE
  • Context
  • RF Front End Specifications
  • Circuit design
  • Conclusion & Perspectives
outline1
OUTLINE
  • Context
  • RF Front End Specifications
  • Circuit design
  • Conclusion & Perspectives
context
Context

MicroElectronicMilestones

  • Computers in the seventies
    • Low cost Si technologies
    • Digital processing
  • The Cellular phone in the 90’s
        • Telecommunication network
        • RF circuits and systems
  • Wireless Sensor Network & RFID in the early 21th century
      • Gate reduction
      • Energy (scavenging, management…)
context1
Context

Wireless Sensor Network Configuration

  • Reduce the node power consumption…

Wireless Sensor Network

B

A

RF link 1

C

RF link 2

…by matching the RF link budget to the communication scenario

outline2
OUTLINE
  • Context
  • RF Front End Specifications
  • Circuit design
  • Conclusion & Perspectives
rf front end specifications
RF Front End Specifications

Node Top-down

  • Node at system level

Memory

RF Link Budget 2

µController

ADC

Sensor

RF Tx/Rx

  • Node Rx at system level

RF Link Budget 1

NFRx2

Power unit

PRx

RFFE

Demodulator

NFRx1

SNRdem

NFRx = PRx - SNRdem+(174-10 log BW)

rf front end specifications1
RF Front End Specifications

RF Link Parameters

BFSK modulation

Channel Characteristic

Attenuation L(R)

PTx

PRx

BER~10-3

distance R

node B

node A

SNRdem~10 dB

BW = 10MHz

NFRx= PRx– SNRdem+ (174-10 log BW)

PRx = PTx - Lpath(R)

2.4 GHz ISM Band

rf front end specifications2
RF Front End Specifications

RFFE and NF specification

  • Node Rx at system level

NFRx2

PRx

RFFE

Demodulator

NFRx1

SNRdem

  • RFFE and system specification

Mixer

LNA

NFRx2

LO

NFRx1

NFRxismainlysupported by the LNA !

rf front end specifications3
RF Front End Specifications

RFFE and NF specification

  • Node Rx at system level

NFRx2

PRx

RFFE

Demodulator

NFRx1

SNRdem

  • RFFE and system specification

Mixer

LNA

NFRx2

LO

NFRx1

NFRxismainlysupported by the LNA !

outline3
OUTLINE
  • Context
  • RF Front End Specifications
  • Circuit design
  • Conclusion & Perspectives
circuit design
Circuit Design

Low Power RF Metric

Optimized biasing!

  • Optimization of RF performances versus power consumption in the transistor…

RF skills

Current consumption

…by maximizing the FOMLP

Vth

~ Vth+ 100mV

circuit design1
Circuit Design

Amplifier Configurations

  • To compensate for the low gm in MI region…

Id

Id

Id

MP

MP

MP

bias

OR

?

RF

RF

RF

out

in

out

out

MN

MN

MN

in

in

Single Transistor Stage (STS)

Self Biased Inverter (SBI)

…active load configurations are preferred!

circuit design2
Circuit Design

Amplifier Configuration

  • Comparison of the Gain BandWidth (GBW) product…

30

Self Biased Inverter (SBI)

20

Gain (dB)

10

Single Transistor Stage (STS)

Frequency (Hz)

0

100G

1G

10G

GBWSTS

…the one of self biased inverter is the largest !

GBWSBI

circuit design3
Circuit Design

LNA topology

LNA 2.4GHz – CMOS 0.13µm

0.8V

VDD

Digital Control

3

VCC

DAC

Id

Cdec

Lpk

50 @ 2.4GHz

Off-chip

M2

Cm2

Rin/buffer

RF

out

50 @ 2.4GHz

M3

Cm3

Lg

Cl

Cm1

in

M1

Rpol2

Rpol1

Vpol2

Vpol1

Currentreuse

with feedback

buffer

LNA core

circuit design4
Circuit Design

Post Layout Performances

S21

NF

900µm

S11

700µm

outline4
OUTLINE
  • Context
  • RF Front End Specifications
  • Circuit design
  • Conclusion & Perspectives
conclusion perspectives
Conclusion & Perspectives

System Considerations

  • Match the radio performances with the RF link budget to reduce the power consumption of nodes in WSN
  • A matter of Noise Figure/Gain reconfiguration in the LNA

Requirement

Circuit analysis

  • Best tradeoff between RF skills and current consumption in MI region
  • Select the topology providing the largest GBW

Good

agreement

conclusion perspectives1
Conclusion & Perspectives

Done

Next step

NFRx2

NFRx1

Last step

  • A mixer to be designed in MI region
    • Gilbert Cell with current bleeding topology

Mixer

LNA

LO

  • A VCO with low power techniques
    • Negative resistance topology
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