duisburgessenuniversity! faculty!of!engineering ......duisburgessenuniversity!...

Duisburg-­‐Essen  University  Faculty  of  Engineering  

Department  of  Electrical  Engineering    and  Informa;on  Technology  

Ins;tute  of  Microwave  and  RF  Technology      

 300  MHz  IQ-­‐Demodulator  for  7-­‐Tesla  MRI  Smart  Amplifier  

 Presendted  by:  Khalid  Zain  Elabdin  

Supervised  by:  Prof.  Dr.-­‐Ing.  Klaus  Solbach      

1  

IntroducLon      

l  Task  assignment  

l  7-­‐Tesla  MRI    

l  I/Q-­‐demodulator  

l  Circuit  design  

l  Test  and  results  

l  Conclusion  

2  

Assignment  

to  design  a  printed  circuit  for  the  I/Q-­‐demodulator  using  the  ICs  and  other  surface-­‐mount  device  (SMD)  components  and  using  microstrip  line  on  a  dielectric  laminate  as  the  printed  circuit  technology  and  using  SubMiniature  version  A  SMA  coaxial  connectors  for  

signal  input  and  output.    

3  

7-­‐Tesla  MRI    

4  

The  System    

5  

I  Q  Demodulator    

§ HMC597LP4  Ø HIGH  LINEARITY  Ø Low  noise  figure    

6  

AD8132    

§ AD8132  DifferenLal  amplifier  Ø Low  cost  –  High  speed    Ø Internal  common-­‐mode  feedback    

7  

Final  SchemaLc  Design  

8  

Layout  Design  

9  

Printed  Circuit  Board    

10  

 Test    

 Measurement              and  Results    

11  

Input  Matching  

12  

Measurment  Setup  

13  

Common  Mode  RejecLon  RaLo  

14  

Output  Power  RF    

15  

RF  Gain  Measurment    

16  

Output  Power  LO    

17  

LO  Gain  measurment  

18  

Quadrature  Accuracy  

                                         ∆ø=86.4°                              

19  

Baseband  Bandwidth    

20  

Conclusion      

Ø  An I Q Demodulator was designed for the 7 tesla Ø  The layout was designed by eagle Ø  The RF gain -11.3 dBm Ø  The baseband bandwidth 17 MHz Ø  The 1 dB compression point 12.3 dBm

21