Measurement of capacitance between strip and GND plane

Measurements performed by Alex Chilingarov at Lancaster University

Introduction

The impedance between the bias rail and the ground plane was measured with an LCR meter in RsCs mode for a range of frequencies. For reasonably low frequencies, the measured Rs is all the bias resistances in parallel. And the measured Cs is all the strip to ground plane couplings in parallel. The measurements were done with the sensor biased for at least one sensor of each ground plane type.

Results for w14, 6 um BCB under the GND plane

Capacitive coupling between bias rail and GND plane versus bias voltage

CsG vs bias voltage w14

Series resistance versus bias voltage

Rs vs. voltage

Capacitive coupling between bias rail and GND plane versus time

Cs vs time

Series resistance versus time

Rs vs time

Summary plot of all measured sensors on w14 and all measured frequencies

Cs for all sensors and all frequencies

Table with calculated strip to GND plane capacitance for w14 at 10 kHz

GND plane type
# strip covered
Cs total
Cs/strip
Rs total
Rs/strip
Solid 129 237.8 pF
1.84 pF 17 kOhm
2.2MOhm
Mesh 50%/30um
128.5 166.8 pF
1.30 pF
18 kOhm
2.4 MOhm
Mesh 50%/80um 126 144 pF
1.14 pF
19 kOhm
2.5 MOhm
Mesh 25%/30um 126.5 95.5 pF
0.76 pF
19 kOhm 2.6 MOhm

Results for w09, 12 um BCB under the GND plane

Capacitive coupling between bias rail and GND plane versus bias voltage

CsG vs bias voltage w09

Series resistance versus bias voltage

Rs vs. voltage

Capacitive coupling between bias rail and GND plane versus time

Cs vs time

Series resistance versus time

Rs vs time

Summary plot of all measured sensors on w14 and all measured frequencies

Cs for all sensors and all frequencies

Table with calculated strip to GND plane capacitance for w09 at 10 kHz

GND plane type
# strip covered
Cs total
Cs/strip
Rs total
Rs/strip
Solid 129133.5 pF
1.03 pF19 kOhm
2.5 MOhm
Mesh 50%/30um
128.5 105.2 pF
0.82pF
22 kOhm
2.9 Mohm
Mesh 50%/80um 126 85.1 pF
0.68pF
21 kOhm
2.8 MOhm
Mesh 25%/30um 126.5 60.9 pF
0.48 pF
24 kOhm
3.1 Mohm

-- LarsEklund - 02 Apr 2009

Topic attachments
I Attachment History Action Size Date Who Comment
GIFgif w09CsG10kHzHold.gif r1 manage 7.6 K 2009-04-08 - 15:19 LarsEklund  
GIFgif w09CsG10kHzUp.gif r1 manage 8.5 K 2009-04-08 - 15:19 LarsEklund  
GIFgif w09CsGvsFreq.gif r1 manage 7.9 K 2009-04-08 - 15:19 LarsEklund  
GIFgif w09RsG10kHzHold.gif r1 manage 8.2 K 2009-04-08 - 15:20 LarsEklund  
GIFgif w09RsG10kHzUp.gif r1 manage 9.9 K 2009-04-08 - 15:20 LarsEklund  
GIFgif w14CsG10kHzHold.gif r2 r1 manage 8.3 K 2009-04-08 - 15:17 LarsEklund  
GIFgif w14CsG10kHzUp.gif r2 r1 manage 9.9 K 2009-04-08 - 15:18 LarsEklund  
GIFgif w14CsGvsFreq.gif r2 r1 manage 9.9 K 2009-04-08 - 15:18 LarsEklund  
GIFgif w14RsG10kHzHold.gif r1 manage 9.5 K 2009-04-08 - 15:18 LarsEklund  
GIFgif w14RsG10kHzUp.gif r1 manage 12.5 K 2009-04-08 - 15:19 LarsEklund  
Topic revision: r4 - 2009-04-08 - LarsEklund
 
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