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LC-Ladder and Capacitive Shunt-Shunt Feedback LNA Modelling for Wideband HBT Receivers Marnus Weststrate Supervisor: Prof Saurabh Sinha Microelectronics & Electronics Group University of Pretoria, South Africa Wednesday, 15 October 2014.

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LC-Ladder and Capacitive Shunt-Shunt Feedback LNA Modelling for Wideband HBT Receivers

Marnus Weststrate

Supervisor: Prof Saurabh Sinha

Microelectronics & Electronics GroupUniversity of Pretoria, South Africa

Wednesday, 15 October 2014

Departement Elektriese, Elektroniese & Rekenaar-Ingenieurswese

Department of Electrical, Electronic & Computer Engineering

Kgoro ya Merero ya Mohlagase, Elektroniki & Bointšinere bja Khomphutha

agenda
Agenda
  • Background to the research
  • Mathematical modelling
    • Input matching
    • Noise figure & its optimization
    • Gain
    • Design equations
  • Simulated results
  • Measured results

Departement Elektriese, Elektroniese & Rekenaar-Ingenieurswese

Department of Electrical, Electronic & Computer Engineering

Kgoro ya Merero ya Mohlagase, Elektroniki & Bointšinere bja Khomphutha

sige processes and lna specs
SiGe processes and LNA specs
  • IBM 8HP process
  • 0.13 µm
  • fT = 200 GHz
  • Simulated
  • IBM 7WL process
  • 0.18 µm
  • fT = 60 GHz
  • Prototyped
current matching techniques
Current Matching Techniques

Resistive termination

1/gm termination

Resistive feedback

Inductive degeneration

Capacitive shunt-shuntfeedback

LC-ladder and inductive degeneration

noise figure optimization
Noise Figure Optimization

L2↓ L1↑ Zs↑

→ L1↑ C1↓

CF↓ ↔ C2↓

gm↑ → Ic↑

rb↓ → le↑

gain derivation
Gain Derivation

IMN:

Stage 1:

Stage 2:

increasing the gain
Increasing the Gain

L2↓ L2↓ Zs↑

→ L1↑ C1↓

CF↓ ↔ C2↓

AV1↑

→ CF↓ nA2↓

→ gm↑ → nVce↓

final lna specs
Final LNA specs

8HP process

7WL process (prototyped)

packaging
Packaging

10 mm

64 pin QFN package

measured results
Measured results

Calibration path

measured results1
Measured results

Gain de-embedding

measured results2
Measured results

Input return loss

measured results3
Measured results

Compared to simulations

P1dB = -22 dBm

Varies between -24 dBm and -21 dBm

conclusion
Conclusion
  • LC-ladder and capacitive feedback topology is feasible for very wideband applications
  • Mathematical model describes the performance and leads to design equations
  • Simulations support the accuracy of the model
  • Initial measured results shows some promise
thank you
Thank you

Acknowledgement

The authors would like to thank ARMSCOR, the Armaments Corporation of South Africa Ltd, (Act 51 of 2003) for sponsoring this study.

DPSS and the CSIR as well as Grintek Ewation are thanked for availing their laboratories for the measurements of the prototyped devices.

Marnus Weststrate

Carl & Emily Fuchs Institute for Microelectronics

Dept.: Electrical, Electronic & Computer Eng.

University of Pretoria

Cnr. Lynnwood and University Rd.

Pretoria 0002

South Africa

E-mail: marnusw@ieee.org