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

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

UNDER GUIDENCE OF

Mr. A.Praveen Kumar

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 FOR GMRT

- Determination of imbalance of the two LNA's
- Study of gain ratio
- Study of phase change

BASICS OF AMPLIFIER FOR GMRT

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

=20log (Vout/Vin)

BASICS OF AMPLIFIER FOR GMRT

- Noise
Noise figure:

F= SNRin/SNRout

=PNout/PNin

Noise figure:

F=10log(NF)

NOISE MEASUREMENT FOR GMRT

- By Noise figure analyzer

NOISE MEASUREMENT FOR GMRT

NOISE MEASUREMENT FOR GMRT

- Optimization of gain
Gain approximately 26db

Noise temperature below 40 Kelvin

THEORETICAL CALCULATION FOR GMRT

- Block diagram with LNA

SIGNAL GENAR-ATOR

VECTOR

VOLT-

METRE

LAPTOP

3DB SPLITTER

LNA1

LNA2

THEORETICAL CALCULATION FOR GMRT

- After 3db splitter
X1=X *A1 *ej1

X2=X*A2 *ej2

- After LNAs
X3 =X1 *G1 *ej1

X4=X2 *G2 *ej2

|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

SIGNAL GENAR-ATOR FOR GMRT

VECTOR

VOLT-

METRE

LAPTOP

3DB SPLITTER

THEORETICAL CALCULATION- Block diagram without LNA

THEORETICAL CALCULATION FOR GMRT

- Experiment without LNAs gives the
(B’/A’ )WITHOUT LNA

&

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

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 FOR GMRT

- Figure 1

PLOT BY MATLAB FOR GMRT

- Figure 2

PLOT BY MATLAB FOR GMRT

- Figure 3

PLOT BY MATLAB FOR GMRT

- Figure 4

PLOT BY MATLAB FOR GMRT

- Figure 5

PLOT BY MATLAB FOR GMRT

- Figure 6

2 FOR GMRTnd EXPERIMENT

Experiment: 1 Experiment: 2

2 FOR GMRTnd EXPERIMENT

Experiment: 1 Experiment: 2

FURTHER IMPROVEMENT FOR GMRT

- Reduction of cable losses
- Cause of gain difference
- Measurement error

Thank You FOR GMRT

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