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

Series resistance versus bias voltage

Capacitive coupling between bias rail and GND plane versus time

Series resistance versus time

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

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

Results for w09, 12 um BCB under the GND plane

Capacitive coupling between bias rail and GND plane versus bias voltage

Series resistance versus bias voltage

Capacitive coupling between bias rail and GND plane versus time

Series resistance versus time

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

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

-- LarsEklund - 02 Apr 2009