1. 3-Stage Low Noise Amplifier Design at 12Ghz
이 준 희
1 4 조
Kwangwoon University

2. Agenda Design Procedure Considerations for Low Noise Amplifier
Specification for Low Noise Amplifier
1-Stage LNA (FET_ATF-36077)
- Characteristics of FET
- Operating point
- Bias Feed Line
- DC Block Line
- Gain, Noise, Stability Circle
- 1-Stage LNA (Schematic and Simulation)
3-Stage LNA
- 3-Stage LNA (Schematic and Simulation)
- HB1 Tone Test
- HB2 Tone Test
- Layout for 3-Stage LNA
Conclusion and Future Work

3. Decision for Active Device
Design Procedure
Time Table for Designing
9.20
9.21
10.2
10.3
10.6
10.7
10.14
10.15
10.20
10.21
11.5
11.6
11.20
11.21
~11.28
Decision for Active Device
Studying Basic
Theory
Design DC
Bias Circuit
Input Matching
Output Matching
EM Simulation
Connect 3 LNAs
And Matching
Documentation
Presentation

4. Considerations for LNA
The most important consideration for LNA
- Noise Figure
- Stability (Conditionally and Unconditionally)
- Gain
LNA is to reduce noise significantly and enhance signal power
Figure. 1 Low Noise Block

5. Specification for 3-Stage LNA
Parameter
Required Specification
Frequency (GHz)
12 Ghz
Band Width (MHz)
400
Noise Figure (dB)
< 1.2
Gain (dB)
≥ 33
Input Return Loss (dB)
< -10
Output Return Loss (dB)
< -15
Gain Flatness (dB)
± 0.5
Stability
Unconditionally stable

6. Design 1-Stage LNA (1)
Characteristics for FET (ATF-36077)

7. Design 1-Stage LNA (2)
Characteristics for FET (ATF-36077)

8. Design 1-Stage LNA (3)
Bias Feed Line

9. Design 1-Stage LNA (4)
DC Block Line

10. Design 1-Stage LNA (5)
Gain Circle, Noise Circle and Stability Circle

11. Design 1-Stage LNA (6)
1-Stage Low Noise Amplifier at 12GHz

12. Design 1-Stage LNA (7)
Simulation for 1-Stage LNA

13. Design 3-Stage LNA (1)
Schematic and Simulation for 3-Stage LNA

14. Design 3-Stage LNA (2)
HB 1-Tone Test for 3-Stage LNA

15. Design 1-Stage LNA (5)
HB 2-Tone Test for 3-Stage LNA

16. Design 3-Stage LNA (4)
Layout of 3-Stage LNA
67.5mm

17. Conclusion and Future Work
- Obtain unconditionally stable
- Noise Figure = 0.89 < 1dB
- S11 = -13dB, S22 = -28dB
- 2dB gain reduction for each LNA (Total =25.5dB)
Future Work
- Fabricate 3-Stage Low Noise Amplifier
- Artwork to reduce size (Up to 60mm)
- Gain Improvement (Up to 27dB)