phase amplitude stability study of 200mhz t0 800mhz lna for gmrt
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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
  • Introduction
  • Basics of amplifier
  • Noise measurement
  • Theoretical calculation
  • Data acquisition
  • Plot by MATLAB
  • Analysis of graph
  • Further improvement
introduction
INTRODUCTION
  • Determination of imbalance of the two LNA\'s
    • Study of gain ratio
    • Study of phase change
basics of amplifier
BASICS OF AMPLIFIER
  • Gain

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

=20log (Vout/Vin)

basics of amplifier1
BASICS OF AMPLIFIER
  • Noise

Noise figure:

F= SNRin/SNRout

=PNout/PNin

Noise figure:

F=10log(NF)

basics of amplifier2
BASICS OF AMPLIFIER

Friis\' formula

Noise temperature

Friis formula for noise temperature

noise measurement
NOISE MEASUREMENT
  • By Noise figure analyzer
noise measurement2
NOISE MEASUREMENT
  • Optimization of gain

Gain approximately 26db

Noise temperature below 40 Kelvin

theoretical calculation
THEORETICAL CALCULATION
  • Block diagram with LNA

SIGNAL GENAR-ATOR

VECTOR

VOLT-

METRE

LAPTOP

3DB SPLITTER

LNA1

LNA2

theoretical calculation1
THEORETICAL CALCULATION
  • 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

VECTOR

VOLT-

METRE

LAPTOP

3DB SPLITTER

THEORETICAL CALCULATION
  • Block diagram without LNA
theoretical calculation3
THEORETICAL CALCULATION
  • Experiment without LNAs gives the

(B’/A’ )WITHOUT LNA

&

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

data acquisition
DATA ACQUISITION
  • Done by LABVIEW program

Total time taken=15*900*13 seconds

=175500 seconds

=48.75 hours.

Data was taken for 48.75 hours

2 nd experiment
2nd EXPERIMENT

Experiment: 1 Experiment: 2

2 nd experiment1
2nd EXPERIMENT

Experiment: 1 Experiment: 2

further improvement
FURTHER IMPROVEMENT
  • Reduction of cable losses
  • Cause of gain difference
  • Measurement error
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