Developments in Readout for Silicon Microstrip Sensors at a Linear Collider Detector

The principle of resistive charge division for position measurement was laid out by Radeka in 1974 [1] but, to date, has not been explored for estimating the longitudinal coordinate for silicon microstrip detectors. To exploit resistive charge division, the impedance of the readout structure must be large relative to the dynamic impedance of the amplifier circuitry. Somewhat counter-intuitively, [1] suggests that, at this level and above, the longitudinal resolution is independent of resistance. Thus, we have explored the use of the implant (60 k/cm) as a readout structure for resistive charge division.