SOI pixel detector based on CMOS time-compression charge-injection
Concept and experimental results obtained from a pixel detector based on CMOS time-compression charge- injection-devices (TC-CID) with a huge internal photocurrent amplification (-104), fabricated in CMOS silicon-on-insulator (SOI) technology are presented. Here, the readout circuitry is fabricated on highly-doped, 200 nm thick SOI film, while the photogate (PG) detector is fabricated on higher-resistivity handle wafer. The latter, together with the 30 V biasing possibilities enhances the quantum efficiency, especially for irradiations with wavelengths in the near-infra-red (NIR) part of the spectra.
Analog CMOS peak detect and hold circuits. Part 2. The two-phase offset-free and derandomizing configuration
An analog CMOS peak detect and hold (PDH) circuit, which combines high speed and accuracy, rail-to-rail sensing and driving, low power, and buffering is presented. It is based on a configuration that cancels the major error sources of the classical CMOS PDH, including offset and common mode gain, by re-using the same amplifier for tracking, peak sensing, and output buffering. By virtue of its high absolute accuracy, two or more PDHs can be used in parallel to serve as a data-driven analog memory for derandomization. The first experimental results on the new peak detector and derandomizer (PDD) circuit, fabricated in 0.35mm CMOS technology, include a 0.2% absolute accuracy for pulses with 500 ns peaking time, 2.7 V linear input range, 3.3 mW power dissipation, 250 mV/s droop rate, and negligible dead time. The use of such a high performance analog PDD can greatly relax the requirements on the digitization in multi-channel systems. r 2002 Elsevier Science B.V. All rights reserved.
Three-dimensional elasticity problems for the prismatic bar
A general solution is given to the three-dimensional linear elastic problem of a prismatic bar subjected to arbitrary tractions on its lateral surfaces, subject only to the restriction that they can be expanded as finite power series in the axial coordinate z. The solution is obtained by repeated differentiation of the tractions with respect to z, establishing a set of sub-problems . A recursive procedure is then developed for generating the solution to from that for . This procedure involves three steps: integration of the stress and displacement fields with respect to z, using an appropriate Papkovich–Neuber (P–N) representation; solution of two-dimensional in-plane and antiplane corrective problems for the tractions in that are independent of z; and expression of these corrective solutions in P–N form. The method is illustrated by an example.