F5DQK July 2009 LNA Harris Telatemp 3101

LNA Telatemp model 310

F5DQK July 2009 LNA Harris Telatemp 3102

Abstract

- External view- Internal view – zoom on passive and active component s- Scalar broadband measurements- Noise/gain measures- Conclusion

F5DQK July 2009 LNA Harris Telatemp 3103

External view

+12V DC

RF out RF in

F5DQK July 2009 LNA Harris Telatemp 3104

Internal view

1st stage 2nd stage 3rd stage

F5DQK July 2009 LNA Harris Telatemp 3105

Internal view : zoom on 1st and 2nd stage

Aluminasthickness 250 µµµµ

Source NiCr resistors with 22 µµµµ Au wedge straps for

best compromise

50 µµµµ Au ribbon straps (DC inputs)

SMA RF input

2nd self polarised GaAs

FET

Isolation cap between stages

1st self polarised GaAs

FET

10 nF decoupling cap 1st DC pin

Drain NiCr (low value) resistors with 22 µµµµ Au wedge straps for best compromise

Grid to GND

F5DQK July 2009 LNA Harris Telatemp 3106

Internal view : zoom on 3rd stage

Aluminasthickness 250 µµµµ

3rd self polarised GaAs

FET

Separation wall for best isolation between stages

SMA RF output

2nd DC pin

Bonding pads with Au wedge

F5DQK July 2009 LNA Harris Telatemp 3107

Internal view : stubing technique with bonding pads on Al2O3

Gate 10kΩΩΩΩNiCr resistor

Au wedge diam 25 µµµµ

Self polarised GaAs FET

47 pF ATC cap

47 pF ATC cap

Bonding pad

50 ΩΩΩΩ line w=250 µµµµ

F5DQK July 2009 LNA Harris Telatemp 3108

Internal view : zoom on NiCr drain resistor

22 µµµµ Au wedge straps for best compromise

F5DQK July 2009 LNA Harris Telatemp 3109

Scalar mesurement setup

F5DQK July 2009 LNA Harris Telatemp 31010

Scalar linear broadband curve

Linear mode if Pin<-35 dBmS11 not marvelous !

F5DQK July 2009 LNA Harris Telatemp 31011

Gain/Nf measurement setup

HP 8350b sweep + HP 83590a plugin

HP 8971b NF test-set

HP 8970b NF noise/gain analyser

F5DQK July 2009 LNA Harris Telatemp 31012

LNA TELATEMP model 310

0

5

10

15

20

25

30

35

5000 6000 7000 8000 9000 10000 11000 12000 13000 14000 15000

Frequency (GHz)

Ga

in (

dB

)

2

3

4

5

6

7

8

9

No

ise

(d

B)

Gain (dB)

Nf (dB)

Gain/Noise figure measurement

Nf min = 2.35 dB

F5DQK July 2009 LNA Harris Telatemp 31013

Conclusion

Broadband LNA usable from :- 7.8 to 8.8 GHz : gain > 25 dB and Nf < 3.5 dB- 10.2 to 12.2 GHz : gain > 25 dB and Nf < 3 dB

A 10.360 GHz : gain 26.8 dB, Nf = 2.85 dB