Search arXiv⌕ Search
Home/Archive/arXiv

arXiv · physics/0008233

Fast and Flexible CCD Driver System Using Fast DAC and FPGA

Emi Miyata·Chikara Natsukari·Daisuke Akutsu·Tomoyuki Kamazuka·Masaharu Nomachi·Masaharu Ozaki
View original source ↗Read source document ↗Export metadata ↓

Abstract

We have developed a completely new type of general-purpose CCD data acquisition system which enables one to drive any type of CCD using any type of clocking mode. A CCD driver system widely used before consisted of an analog multiplexer (MPX), a digital-to-analog converter (DAC), and an operational amplifier. A DAC is used to determine high and low voltage levels and the MPX selects each voltage level using a TTL clock. In this kind of driver board, it is difficult to reduce the noise caused by a short of high and low level in MPX and also to select many kinds of different voltage levels. Recent developments in semiconductor IC enable us to use a very fast sampling ($\sim$ 10MHz) DAC with low cost. We thus develop the new driver system using a fast DAC in order to determine both the voltage level of the clock and the clocking timing. We use FPGA (Field Programmable Gate Array) to control the DAC. We have constructed the data acquisition system and found that the CCD functions well with our new system. The energy resolution of Mn K$α$ has a full-width at half-maximum of $\simeq$ 150 eV and the readout noise of our system is $\simeq$ 8 e$^-$.

Explore related subjects

physics.ins-det

Keep this discovery

Explore connections, maps & timelines

BibTeXRIS

Emi Miyata, Chikara Natsukari, Daisuke Akutsu, Tomoyuki Kamazuka, Masaharu Nomachi, Masaharu Ozaki. 2000-08-29. Fast and Flexible CCD Driver System Using Fast DAC and FPGA. https://doi.org/10.1016/s0168-9002(00)01015-9

Cite the original work for its findings. Save a collection to share your selection of sources.

KEEP EXPLORING

Related papers

arXiv2026

Small but Tubby: A Magnetic Loop Antenna Made from 100 mm Copper Tubing

This paper presents the electrical model, key equations, and practical construction of a small transmitting magnetic loop antenna built from unusually large 100 mm diameter copper tubing. The large conductor surface area and wide-area transitions to the vacuum capacitors were designed to minimize resistive losses. The frequency range from 1.8 MHz to 31 MHz is unusually wide. Frequency, impedance matching, and azimuth are all adjusted automatically by servo motors. Indoor losses originate predominantly from near-field coupling to the environment rather than from the antenna itself. Temperature-rise measurements confirm that the bulk of the dissipated power is absorbed by the environment, not by the antenna components. The conducted H-field measurements demonstrate good agreement between the measured H-field and the theoretical free-space H-field calculated from the antenna geometry and an estimated loop current. The loop current was estimated from the measured antenna bandwidth and the applied transmit power. The antenna was developed for indoor operation where outdoor installation is not possible.

physics.ins-det↗
arXiv2026

Triaxial $μ$-PIC for resolving Multi-Hit Ambiguity

The micro pixel chamber ($μ$-PIC), a type of micro-pattern gaseous detectors (MPGD), features pixel electrodes structured similarly to a sliced proportional counter. Conventionally, $μ$-PIC electrodes are connected to orthogonal strip electrodes to reduce the number of readout circuits; however, this configuration introduces multi-hit ambiguity when tracing winding tracks or during high-rate operations. A well-known solution to this problem is the adoption of an additional readout axis. To this end, we designed a new electrode structure using Garfield++ simulations and fabricated a triaxial $μ$-PIC based on through-glass-via (TGV) technology. This triaxial $μ$-PIC achieved a high gas gain of $1.1\times 10^4$ and the energy resolution of 22\% (FWHM) at 5.9~keV, Furthermore, the false-hit probability was less than 0.78\% at a 95\% confidence level for two clusters separated by a distance of over 3 mm, consistent with Garfield++ predictions. With this triaxial $μ$-PIC, single avalanche signals are collected from three independent readout strip electrodes (the anode and two cathodes). The charge ratio among these electrodes remains nearly constant at anode:U-cathode:V-cathode=3:2:1. In addition, we successfully achieved an enhanced gain of $3.2\times 10^4$ without increasing the discharge risk by employing an alternative operation mode.

physics.ins-det↗
arXiv2026

Experimental Characterization of Bulk Micromegas for Development of Active Target Time Projection Chamber for Nuclear Astrophysics Studies

A Micromegas-based active target Time Projection Chamber, namely Saha Active Target TPC (SAT-TPC), is under development at Saha Institute of Nuclear Physics for its application in nuclear astrophysics experiment to measure the branching ratio of the direct and sequential decay of the Hoyle state of $^{12}$C. A bulk Micromegas was characterized to optimize its operating parameters and its performance for $α$-particle tracking was investigated using gas mixtures Ar + CO$_{2}$ (90:10) and Ar + i-C$_4$H$_{10}$ (95:5) at atmospheric pressure using 5.9~keV X-ray and 5.48~MeV $α$-particles from radioactive sources. A hydrodynamic transport model was used to simulate the charge-deposit profile of the $α$-particle track on the Micromegas readout and compared to the experimental data to complement the experimental measurement as well as validate the numerical model. A good agreement was observed that confirmed the suitability of the choice of the bulk Micromegas in the development of the SAT-TPC prototype and the hydrodynamic modelling of the detector dynamics

physics.ins-det↗