Inter-strip capacitance measurments

Measurements performed by Alex Chilingarov, University of Lancaster and analysis is done by Lars Eklund, University of Glasgow.

Reverse current vs. voltage for w14 (6 um BCB), w09 (12 um BCB) and bare sensors

For an explanation of the plot legend, see below

Reverse current vs. time for w14 (6 um BCB), w09 (12 um BCB) and bare sensors

For an explanation of the plot legend, see below

Inter-strip capacitance measurements, w14 (6 um BCB)

Capacitance was measured between one strip and its two nearest neighbours at 100 kHz and 1 MHz.

The measurement consists of a bias voltage ramp, then the sensor is kept at maximal voltage.

See below for plot legend

Plot legend description: XNYM-KK-A/B/C/D-GNDPlaneType

Coordinates on the wafer are given by N and M and the number of the measured strip is given by KK

The measurements were done in four different configurations of the bias rail connection:

The GND plane types are:

Inter-strip capacitance measurements, w09 (12 um BCB)

Capacitance was measured between one strip and its two nearest neighbours at 100 kHz and 1 MHz.

The measurement consists of a bias voltage ramp, then the sensor is kept at maximal voltage.

See below for plot legend

Plot legend description: XNYM-KK-A/B/C/D-GNDPlaneType

Coordinates on the wafer are given by N and M and the number of the measured strip is given by KK

The measurements were done in four different configurations of the bias rail connection:

The GND plane types are:

Comparison of GND scheme D only, w14 (6 um BCB)

Comparison of sensors without GND plane, w14 (6 um BCB) and bare sensor

Comparison tables and plots

Summary histogram of Cis for sensors covered by only BCB, BCB plus solid GND plane or nothing (bare). Sensors with ground planes are measurend in two different configurations, A and D at 100 kHz.

Summary histgram of all different types of ground planes, all measured in configuration D at 100 kHz.

Summary histogram of Cis for sensors covered by only BCB, BCB plus solid GND plane or nothing (bare). Sensors with ground planes are measurend in two different configurations, A and D at 1 MHz.

Summary histgram of all different types of ground planes, all measured in configuration D at 1 MHz.

Summary of the final interstrip capacitance values at 100 kHz for both thicknesses, mean values extracted from the histogram above. The Cis for bare sensors is an upper limit since the value has not yet reached it's plateau value.

-- LarsEklund - 16 Dec 2008