Darmstadt 2008 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 47: Instrumentation und Anwendungen II

HK 47.4: Talk

Friday, March 14, 2008, 14:45–15:00, 2D

A multipurpose programmable read-out chip — •Massimiliano De Gaspari, Hans-Kristian Soltveit, and Johanna Stachel — Physikalisches Institut, Heidelberg

A mixed-signal integrated chip in IBM 130nm technology suitable to a variety of detectors with different requirements is under development. The CBM experiment at FAIR could be a good candidate for the use of this chip.

The chip can read out 128 channels, which can be masked in groups of 16, 32 or 64. The multichannel ASIC includes a low noise PreAmplifier and Shaping Amplifier (PASA), a Peak Detector (PD), a Time-to-Amplitude Converter (TAC) and fast arbitration and sequencing logic to concentrate the data before it is sent to a pipelined Analog-to-Digital Converter (ADC).

The chip is self-triggered, which is essential for applications where the detector pulses arrive randomly in time.

The PASA is programmable for different detector capacitances (from 1pF to 50pF), input pulse polarity, preamplifier gain, peaking time (from 20 to 200ns) and conversion gain in order to suit a wide range of application requirements.

The ADC is programmable to support either 8, 10 or 12 bit resolution with a conversion rate from 1MHz to 100MHz; the switched-capacitor bias network provides bias currents proportional to the operating frequency.

Simulations of the ADC will be shown together with plots of the expected performance.