wide-band spice model of the high-speed and high-voltage transformers for the ccd220 jorge romero...
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Wide-Band Spice Model of the High-Speed and High-Voltage Transformers for the CCD220
Jorge RomeroUniversity of Málaga (http://www.uma.es)
Javier Reyes (Presenter), Mark DowningEuropean Southern Observatory, ESO (http://www.eso.org)
Scientific Detector Workshop 2013. 7-11 October 2013. Florence, Italy10 October 2013 1Spice Model of the High-Voltage Transformers for the CCD220
10 October 2013 2Scientific Detector Workshop 2013. 7-11 October 2013. Florence, Italy
ESO Adaptive Optics Camera• CCD220 is and EMCCD• High-Voltage clock key element for electron multiplication• At the core of the high-voltage clock there is a high-speed transformer
Spice Model of the High-Voltage Transformers for the CCD220
99,0
1T
snarT
1S
DNG
Fp001
31CpaC
DNG
1DreifitcerFR
3
26
74
8,5,12U
3
26
74
8,5,1
6U
f
f
~~~//
~~~//
tesIH_V
tesOL_V
hctiws
Fp001
21C
VH2ihpRDCC
DNG
Peak Detector
Peak Detector
High-Voltage PID controller• MOSFET switching at the primary of the transformer• PID controller
10 October 2013 3Scientific Detector Workshop 2013. 7-11 October 2013. Florence, Italy
Measurement and Vector Fitting• The S-Parameter measurements have the interesting
property that it is not necessary to perform neither shorts nor opens on the network during the measurement process (unlike other kind of representations, say Z or Y parameters)
• One can translate S parameter to Z or Y parameters
Spice Model of the High-Voltage Transformers for the CCD220
TWO-PORTNETWORK
[S]
a1 a2
b1b2
V1 V2I1I2
10 October 2013 4Scientific Detector Workshop 2013. 7-11 October 2013. Florence, Italy
Spice Model of the High-Voltage Transformers for the CCD220
99,0
1T
snarT
1S
DNG
Fp001
31CpaC
DNG
1DreifitcerFR
3
26
74
8,5,12U
3
26
74
8,5,1
6U
f
f
~~~//
~~~//
tesIH_V
tesOL_V
hctiws
Fp001
21C
VH2ihpRDCC
DNG
Peak Detector
Peak DetectorVi_n
H12
-4.31265392e9/(s+3.9507498e9)-1.09143570e8/(s+1.0735469e9)+7.92278561e7/(s+1.0212672e8)-1.56746016e5/(s+1.6547306e7)-6.54319475e2/(s+8.5316223e4)+0.426917671Hb2 14.142136
50
R1
HI2 3.5355339
EV2 70.710678m
2.37189911e9/(s+3.9507498e9)-2.11755009e8/(s+1.0735469e9)-1.65850558e8/(s+1.0212672e8)-4.09919783e5/(s+1.6547306e7)+6.63947824e2/(s+8.5316223e4)+245.48159e-3
G_22 G21
1
G12
1
-3.35252967e9/(s+3.9507498e9)-5.94329189e8/(s+1.0735469e9)-3.64233892e7/(s+1.0212672e8)+1.56094954e5/(s+1.6547306e7)+1.19158183e2/(s+8.5316223e4)+7.5844235e-1
G_11
EV1 70.710678m
HI1 3.5355339
50
R2
Hb1 14.1421356
H21
-4.31265392e9/(s+3.9507498e9)-1.09143570e8/(s+1.0735469e9)+7.92278561e7/(s+1.0212672e8)-1.56746016e5/(s+1.6547306e7)-6.54319475e2/(s+8.5316223e4)+0.426917671
Vo_p
Vo_n
Vi_p
Very accurate modellingThe extracted model includes:• The effect of the magnetic coupling between the transformer
windings• The conductor losses• The interwinding parasitic capacitances• The stray capacitances of the PCB footprint and metal tracks
Model of the transformer
Frequency-response of the resonant circuit.
Fine tuning of the PID parameters possible
The Spice model
• The transformer’s behaviour was accurately modeled as a linear circuit in the Laplace Domain by a network of controlled current and voltage sources. Time-domain
simulation around the resonance frequency
10 October 2013 5Scientific Detector Workshop 2013. 7-11 October 2013. Florence, Italy
Unoptimized HV-clock step response
Optimized HV-clock step response
RTD cut on the unoptimized CCD RTD cut on the optimized CCD
Experimental Results
The oscilloscope shows that the HV-clock of the CC220 varies during the frame readout and variation is proportional to illumination level. This sensitivity to disturbances can be minimized with the proper tuning of the PID controller. Thanks to the accurate model of the transformer the value of the components in the PID have been optimized by simulation to respond quickest to disturbances.
All the simulations have been confirmed by measurements and both agree extremely well. The excellent results speak by themselves.
Spice Model of the High-Voltage Transformers for the CCD220