Area integrator servo demodulator with on-chip CMOS analog-to-di

Coded data generation or conversion – Analog to or from digital conversion – Analog to digital conversion

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

341163, 341156, H03M 138

Patent

active

056614837

ABSTRACT:
An integrated circuit for a disk drive that includes a sucessive-approximation analog-to-digital converter (ADC) with a two-stage digital-to-analog converter (DAC) and may also include a servo demodulator. The circuit may be implemented in a basic or pure-digital CMOS chip because the ADC includes no precision analog elements such as resistors and capacitors. The first DAC stage operates on the most significant group of bits, and the second DAC stage operates on the least significant group of bits. The DAC includes a reference current source. The first DAC stage is a multiplying DAC that multiplies the reference current in response to its digital input, and the second stage is a dividing DAC that divides the reference current in response to its input. The DAC also includes a current summer, such as a resistor, that receives the output current of each stage and provides the voltage that corresponds to the sum of the currents to a comparator. The comparator output controls a successive-approximation register. The circuit of this invention is suitable for use in implementing an Area Integrating Servo Demodulator (AISD) for detecting head position information in a disk drive servo signal without precision analog components.

REFERENCES:
patent: 4311988 (1982-01-01), Kelley et al.
patent: 4598269 (1986-07-01), Penney
patent: 4649371 (1987-03-01), Kolluri
patent: 5489904 (1996-02-01), Hadidi

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Area integrator servo demodulator with on-chip CMOS analog-to-di does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Area integrator servo demodulator with on-chip CMOS analog-to-di, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Area integrator servo demodulator with on-chip CMOS analog-to-di will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-1991207

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.