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Paper presentation Ultra-Portable Devices Paper: Wang S.B.T, - - PowerPoint PPT Presentation

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Paper presentation Ultra-Portable Devices Paper: Wang S.B.T, Nikejad A.M, et al. Design of a Sub-mW 960-MHz UWB CMOS LNA. Journal of Solid-State Circuits, vol.41, no.11, pp.2449- 2456, Nov. 2006. Presented by: Carl Bryant 2009-11-30

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SLIDE 1

Paper presentation – Ultra-Portable Devices

Paper: Presented by:

Wang S.B.T, Nikejad A.M, et al. Design of a Sub-mW 960-MHz UWB CMOS LNA. Journal of Solid-State Circuits, vol.41, no.11, pp.2449- 2456, Nov. 2006.

Carl Bryant

2009-11-30 1 Paper Presentation - Ultra Portable Devices

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SLIDE 2

Outline

  • Introduction
  • UWB circuits
  • Hybrid LNA
  • Results
  • Summary

2009-11-30 2 Paper Presentation - Ultra Portable Devices

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SLIDE 3

Introduction

  • UWB LNA
  • Low power
  • Differential
  • UWB → Inductorless
  • Intended for UWB (pulsed) radio

2009-11-30 Paper Presentation - Ultra Portable Devices 3

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SLIDE 4

Introduction

  • In UWB system most noise is from interference
  • Very low LNA noise figure not important
  • Most interference power is already in-band
  • Thus folding interferance into band not a great concern
  • i.e. IIP3 spec not very important either
  • Goal is instead to minimize power consumption for moderate

NF and linearity

2009-11-30 Paper Presentation - Ultra Portable Devices 4

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SLIDE 5

UWB circuits

2009-12-01 Paper Presentation - Ultra Portable Devices 5

  • (a) Resistor terminated CS (R-CS)
  • (b) Shunt feedback (SFB)
  • (c) Common gate (CG)
  • Inductorless matching
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SLIDE 6

UWB circuits

  • Resistor terminated

– Lowest possible power consumption – High noise figure – NF<6dB → gm > 25mA/V

  • CG and SFB

– NF<6dB → gm > 5mA/V – Zin=50Ω → gm > 20mA/V

  • Differential amplifier

– Input voltage halved on each side – Same Zin → Double power consumption

2009-11-30 Paper Presentation - Ultra Portable Devices 6

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SLIDE 7

UWB circuits

2009-12-01 Paper Presentation - Ultra Portable Devices 7

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SLIDE 8

UWB circuits

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  • Complementary SFB and CG amplifier stages
  • More gm for the same current (but slower)
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SLIDE 9

Hybrid LNA

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  • Cross coupled stages act as both SFB and CG amplifier stages
  • SFB is inverting, CG is non-inverting
  • Effectively doubles Vgs swing
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SLIDE 10

Hybrid LNA

2009-11-30 Paper Presentation - Ultra Portable Devices 10

  • Small signal analysis
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SLIDE 11

2009-11-30 Paper Presentation - Ultra Portable Devices 11

1 4

,

 

f m DC V

R g A

m in

g Z 4 1 

 

f S S P m N m

R R R g g F 8 2 1 1

, ,

             1 4 1

, ,

F R g g

S P m N m

  • Both NMOS and PMOS contribute gain
  • Noise figure much like CG or SFB amplifier

 

 

gs gd f dB

C C r R f  

3

2 1 

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SLIDE 12

Hybrid LNA

2009-11-30 Paper Presentation - Ultra Portable Devices 12

  • LNA with output buffer
  • Additional cross coupling of bulks for extra gain (5-15%)
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SLIDE 13

Results

2009-11-30 Paper Presentation - Ultra Portable Devices 13

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SLIDE 14

Results

2009-11-30 Paper Presentation - Ultra Portable Devices 14

Technology 0.13μm CMOS BW 100-930 MHz Gain 13 dB NF 4 dB IIP3

  • 10.2 dB

CP1dB

  • 18 dBm

Power 0.7 mA @ 1.2V

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SLIDE 15

Summary

  • Design of differential inductorless LNA
  • Low power consumption makes gain and matching difficult
  • Use complementary devices and cross couplings
  • 0.7mA with Zin=50Ω

2009-11-30 15 Paper Presentation - Ultra Portable Devices

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SLIDE 16

Chip photo

2009-11-30 Paper Presentation - Ultra Portable Devices 16