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PHASE & AMPLITUDE STABILITY STUDY OF 200MHz T0 800MHz LNA FOR GMRT. by ARNAB MANDAL [email protected] UNDER GUIDENCE OF Mr. A.Praveen Kumar. OUTLINE OF THE TALK. Introduction Basics of amplifier Noise measurement Theoretical calculation

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Phase amplitude stability study of 200mhz t0 800mhz lna for gmrt

PHASE & AMPLITUDE STABILITY STUDY OF 200MHz T0 800MHz LNA FOR GMRT

by

ARNAB MANDAL

[email protected]

UNDER GUIDENCE OF

Mr. A.Praveen Kumar


Outline of the talk
OUTLINE OF THE TALK FOR GMRT

  • Introduction

  • Basics of amplifier

  • Noise measurement

  • Theoretical calculation

  • Data acquisition

  • Plot by MATLAB

  • Analysis of graph

  • Further improvement


Introduction
INTRODUCTION FOR GMRT

  • Determination of imbalance of the two LNA's

    • Study of gain ratio

    • Study of phase change


Basics of amplifier
BASICS OF AMPLIFIER FOR GMRT

  • Gain

    G (dB) =10log (Pout/Pin)

    =20log (Vout/Vin)


Basics of amplifier1
BASICS OF AMPLIFIER FOR GMRT

  • Noise

    Noise figure:

    F= SNRin/SNRout

    =PNout/PNin

    Noise figure:

    F=10log(NF)


Basics of amplifier2
BASICS OF AMPLIFIER FOR GMRT

Friis' formula

Noise temperature

Friis formula for noise temperature


Noise measurement
NOISE MEASUREMENT FOR GMRT

  • By Noise figure analyzer



Noise measurement2
NOISE MEASUREMENT FOR GMRT

  • Optimization of gain

    Gain approximately 26db

    Noise temperature below 40 Kelvin


Theoretical calculation
THEORETICAL CALCULATION FOR GMRT

  • Block diagram with LNA

SIGNAL GENAR-ATOR

VECTOR

VOLT-

METRE

LAPTOP

3DB SPLITTER

LNA1

LNA2


Theoretical calculation1
THEORETICAL CALCULATION FOR GMRT

  • After 3db splitter

    X1=X *A1 *ej1

    X2=X*A2 *ej2

  • After LNAs

    X3 =X1 *G1 *ej1

    X4=X2 *G2 *ej2

    |B/A|=[G2 *ACABLE 2 *A CHANNEL 2]/[G1*ACABLE 1 *A CHANNEL 1]

    Phase part:

    B-A= (Phase change) LNA+ (Phase change) SPLITTER

    +(Phase change) CABLE


Theoretical calculation2

SIGNAL GENAR-ATOR FOR GMRT

VECTOR

VOLT-

METRE

LAPTOP

3DB SPLITTER

THEORETICAL CALCULATION

  • Block diagram without LNA


Theoretical calculation3
THEORETICAL CALCULATION FOR GMRT

  • Experiment without LNAs gives the

    (B’/A’ )WITHOUT LNA

    &

    B’-A’=(Phase change)SPLITTER+ (Phase change)CABLE


Data acquisition
DATA ACQUISITION FOR GMRT

  • Done by LABVIEW program

    Total time taken=15*900*13 seconds

    =175500 seconds

    =48.75 hours.

    Data was taken for 48.75 hours


Plot by matlab
PLOT BY MATLAB FOR GMRT

  • Figure 1


Plot by matlab1
PLOT BY MATLAB FOR GMRT

  • Figure 2


Plot by matlab2
PLOT BY MATLAB FOR GMRT

  • Figure 3


Plot by matlab3
PLOT BY MATLAB FOR GMRT

  • Figure 4


Plot by matlab4
PLOT BY MATLAB FOR GMRT

  • Figure 5


Plot by matlab5
PLOT BY MATLAB FOR GMRT

  • Figure 6


2 nd experiment
2 FOR GMRTnd EXPERIMENT

Experiment: 1 Experiment: 2


2 nd experiment1
2 FOR GMRTnd EXPERIMENT

Experiment: 1 Experiment: 2


Further improvement
FURTHER IMPROVEMENT FOR GMRT

  • Reduction of cable losses

  • Cause of gain difference

  • Measurement error


Thank You FOR GMRT


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