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Scanners for Visualizing Activity of Analog VLSI Circuitry
| Content Provider | Semantic Scholar |
|---|---|
| Author | Mead, Carver A. Delbrock, Tobias |
| Copyright Year | 1991 |
| Abstract | This paper tutorially describes mixed digital-analog serial multiplexers (scanners) that we use to visualize the activity of oneand two-dimensional arrays of analog VLSI elements. These scanners range from simple onedimensional devices designed to scan a one-dimensional array onto an oscilloscope, to complete video scanners with integrated sync and blank computation and on-chip video amplifiers. We discuss practical details of design and performance, and we give a source for example scanner layout. 1. Using Scanners in Analog VLSI Design We use scanners as a diagnostic tool, to observe the behavior of large analog VLSI chips, when the chips have far more nodes than the pins available to us, or when the chip has a topography that maps well onto a display device. This paper is a tutorial description of the distilled knowledge gained from over 100 chip designs using scanners. We describe how our scanners work and how we use them to multiplex outputs from oneand twodimensional arrays onto output devices such as oscilloscopes and monitors. In section 2, we discuss onedimensional scanners and their component parts as prototypical of two-dimensional scanners. In section 3, we discuss two-dimensional scanners and generation of video control signals. In section 4, we discuss the analog parts of the scanners: output representations, current-sense amplifiers, and video drivers. In section 5, we discuss performance of the digital and analog parts of the scanners. Finally, in section 6, we discuss practical design details. 2. A One-Dimensional Scanner Figure 1 shows a one-dimensional scanner. This scanner multiplexes the output from a one-dimensional array of pixels serially onto a single output line. The pixels generate analog currents that are to be scanned out and displayed. The pixel outputs are multiplexed by MOS switches onto the output line or onto the reference line. At a part icular point in the scan, one pixel sends its output into the output line, and all the other pixels feed Sync , ' p p |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://www.ini.unizh.ch/~tobi/anaprose/scanners/paper/scannermead91.pdf |
| Alternate Webpage(s) | http://www.ini.uzh.ch/~tobi/anaprose/scanners/paper/scannermead91.pdf |
| Language | English |
| Access Restriction | Open |
| Subject Keyword | Amplifier Analog Analog-to-digital converter Array data structure Computation Display device Electronic circuit Gain Image scanner Map Monitor (synchronization) Multiplexer Multiplexing Network switch Oscilloscopes Output device Pixel Scanner Device Component Scanning Switch Device Component Topography Very-large-scale integration |
| Content Type | Text |
| Resource Type | Article |
