A 5 4mw gps cmos quadrature front end based on a single stage lna mixer vco
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A 5.4mW GPS CMOS Quadrature Front End based on a single-stage LNA-Mixer-VCO PowerPoint PPT Presentation


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A 5.4mW GPS CMOS Quadrature Front End based on a single-stage LNA-Mixer-VCO. Antonio Liscidini (1) , Andrea Mazzanti (2) , Riccardo Tonietto (3) , Luca Vandi (4) , Pietro Andreani (4) , and Rinaldo Castello (1) (1) Universit à degli Studi di Pavia, Pavia, Italy

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A 5.4mW GPS CMOS Quadrature Front End based on a single-stage LNA-Mixer-VCO

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A 5 4mw gps cmos quadrature front end based on a single stage lna mixer vco

A 5.4mW GPS CMOS Quadrature Front End based on a single-stage LNA-Mixer-VCO

Antonio Liscidini (1), Andrea Mazzanti (2), Riccardo Tonietto (3), Luca Vandi (4), Pietro Andreani (4), and Rinaldo Castello (1)

(1) Università degli Studi di Pavia, Pavia, Italy

(2) Università di Modena and Reggio Emilia, Modena, Italy

(3) STMicroelectronics, Pavia, Italy

(4) Technical University of Denmark, Kgs. Lyngby, Denmark


Mixer inside lc oscillator

Mixer inside LC Oscillator

  • Any RF signal in the VCO bias current is naturally down-converted at IF

  • LC tank dramatically attenuates the low frequency components of Vout

Problem: how to sense the down-converted current signal preserving oscillation

How sensing the down- converted current signal without perturbing the oscillator ?


Double switching pairs self oscillating mixer som

Double Switching Pairs Self Oscillating Mixer (SOM)

  • All RF signal current is down converted leading:

Semi-period with M2 and M4 on


Lna mixer vco lmv cell

LNA, Mixer and VCO share bias and devices

LNA-Mixer-VCO (LMV) Cell

  • LNA is implemented re-using M1 in a inductive degenerated topology.

  • Three transistor stacked but minimum VDD is 1 VTH plus 3 VOV


Lmv cells in quadrature

LMV Cells in Quadrature

Traditional cross-coupling topology for quadrature generation


Gps low if quadrature receiver

GPS Low IF Quadrature Receiver

GPS quadrature Front-End: Low IF architecture at 4MHz


Conclusions

Conclusions

  • The functionalities of RF amplification, mixing and LO generator were successfully merged in a single stage.

  • The LMV cell represents a competitive solution to reduce power consumption, compatible with low voltage supply.

  • The LMV cell was advantageously used in a very low power GPS quadrature front-end.


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