Interpolated timing recovery for hard drive read channels

Engineering Information Abstracts (Part II) pates 11 mWrchannel from a 5 V supply. ŽAuthor abstract . 4 Refs. In English EI Order Number: EIP97113912789 Keywords: Readout systems; Solid state devices; Analog to digital conversion; CMOS integrated circuits; Integrated circuit manufacture; Mathematical models; Medical imaging Title: INTERPOLATED TIMING RECOVERY FOR HARD DRIVE READ CHANNELS Author(s): Spurbeck, Mark; Behrens, Richard T. Corporate Source: Cirrus Logic, Colorado, Broomfield, CO, USA Conference Title: Proceedings of the 1997 IEEE International Conference on Communications, ICC. Part 3 Žof 3. Conference Location: Montreal, Can Conference Date: 1997060819970612 Source: IEEE International Conference on Communications v 3 1997. IEEE, Piscataway, NJ, USA,97CB36067. p 1618-1624 CODEN: 002115 Publication Year: 1997 Abstract: We propose an architecture for hard disk drive read channels in which the signal from the read head is asynchronously sampled at a frequency slightly higher than the channel bit rate. Synchronous samples are subsequently computed by interpolation, and used by a conventional sequence detector such as a Viterbi detector for partial response. This architecture allows design of a fully digital PLL, including a digital ZPR function. In addition, the latencies of the ADC and FIR equalization filter do not contribute to loop delay. A cost effective, well performing implementation is described. ŽAuthor abstract . 6 Refs. In English EI Order Number: EIP97103858300 Keywords: Computer architecture; Computer system recovery; Interpolation; Phase locked loops; Digital filters; Cost effectiveness Title: PLANAR-ASSEMBLY TRIAXIAL MICROAC CELEROMETER WITH ELECTROMECHANICAL SIGMADELTA ADCS Author(s): Wuestling, S.; Fromhein, O.; Gemmeke, H.; Tschuch, M.; Wollersheim, O. Corporate Source: Forschungszentrum Karlsruhe, Karlsruhe, Ger Conference Title: Proceedings of the 1996 10th EUROSENSORS Conference. Part 2 Žof Conference Location: Leuven, Belg Conference Date: 19960908-19960911 Source: Sensors and Actuators, A: Physical v 61 n 1-3 June 1997. p 436-440 CODEN: SAAPEB ISSN: 0924-4247 Publication Year: 1997 Abstract: By combination of two LIGA-fabricated micromechanical acceleration sensors with a Z-axis sensitive acceleration sensor element, a planar assembly of a triaxial microaccelerometer can be put into practice. In our readout system, each channel consists of a dedicated full-custom ASIC electromechanical sigma-delta modulator and a digital sincŽf. decimation filter. The output data interface is intended for readout by microcontrollers and digital signal processors ŽDSPs.. Software-programmable reference voltages facilitate self-test and software-controlled range and offset adjustment.

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Temperature compensation can be performed by reading the output of a temperature-sensing circuit on the sensor head. The measured noise level is 5 mu g Hzminus at a measuring range of plus or minus 1.5 g. Simulations with a dedicated high-level simulator have shown that the sensitivity can be increased by at least one order of magnitude by optimizing the sigma-delta modulators. As an example for application, an acceleration data logger will be described. Finally, we present the design of an improved accelerometer chipset which consists of a single sensor head chip and an enhanced decimation filter interface. ŽAuthor abstract . 3 Refs. In English EI Order Number: EIP97103863036 Keywords: Microelectromechanical devices; Accelerometers; Sensors; Analog to digital conversion; Application specific integrated circuits; Digital signal processing; Delta modulation; Modulators; Readout systems; Digital filters Title: ADAPTIVE CALIBRATION TECHNIQUE FOR MICROMACHINED PRESSURE SENSORS Author(s): Lloyd, Jennifer A.; Lee, Hae-Seung; Parameswaran, Lalitha; Schmidt, Martin A.; Sodini, Charles G. Corporate Source: Massachusetts Inst of Technology, Cambridge, MA, USA Conference Title: Proceedings of the 1997 International Conference on Solid-State Sensors and Actuators. Part 1 Žof 2. Conference Location: Chicago, IL, USA Conference Date: 19970616-19970619 Source: International Conference on Solid-State Sensors and Actuators, Proceedings v 1 1997. IEEE, Piscataway, NJ, USA,97TH8267. p 295-298 CODEN: 002336 Publication Year: 1997 Abstract: An adaptive calibration technique which continuously calibrates the linearity of capacitive microsensors is described. The sensing system utilizes two sense capacitors of different size and two sigma-delta Ž Sigma Delta . analog-todigital converters ŽADCs.. A small, linear sensor is used to calibrate the linearity of a larger, higher-resolution sensor. The integrated circuit containing the ADCs is built in a 0.6 mu m, double-poly CMOS technology and uses 150 mW from a 5 V supply. ŽAuthor abstract . 2 Refs. In English EI Order Number: EIP97103873604 Keywords: Pressure transducers; Calibration; Analog to digital conversion; Capacitance; CMOS integrated circuits Title: IMAGE CAPTURE CIRCUITS IN CMOS Author(s): Fossum, Eric R. Corporate Source: Photobit, La Crescenta, CA, USA Conference Title: Proceedings of the 1997 International Symposium on VLSI Technology, Systems, and Applications Conference Location: Taipei, China Conference Date: 1997060319970605 Source: International Symposium on VLSI Technology, Systems, and Applications, Proceedings 1997. IEEE, Piscataway, NJ, USA. p 52-57 CODEN: 002207 Publication Year: 1997 Abstract: CMOS image sensors are a second-generation solid-state imaging technology. CMOS active pixel sensors have performance competitive with CCD technology, and offer