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A Dynamic Slew Correction Circuit for Low Noise Silicon Detector Pre-amplifiers

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5 Author(s)
Ip, H.M.D. ; Imperial Coll. London, London, UK ; Thomas, S. ; Hart, M. ; Prydderch, M.
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This manuscript introduces a transistor level technique that results in simultaneous improved slew rate and noise performance for applications where only the final settled output voltage over a predefined time frame is important - such as silicon detector read out charge-to-voltage reset amplifiers. For large signal swings, slew limitation is detected and compensated dynamically. For non-slew limiting situations the amplifier operates normally in a low noise mode. To verify correct operation of the dynamic slew correction circuit, a single-ended, pulse-reset charge amplifier was fabricated in IBM 130 nm 6M/2P technology. The test amplifier achieved a slew rate of 1V/120 ns with a 50 pF load and a total of ~ 23μVrms noise over 100 kHz-20 MHz. The reported amplifier also serves as the basis for the high performance front-end amplifier in the LPD detector system for the European XFEL.

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Nuclear Science, IEEE Transactions on  (Volume:59 ,  Issue: 3 )