Title:
HIGH SPEED ANALOG-TO-DIGITAL CONVERTER USING A UNIQUE GRAY CODE HAVING MINIMAL BIT TRANSITIONS
Document Type and Number:
WIPO Patent Application WO2003077423
Kind Code:
A3
Abstract:
A method for high speed communications uses an inventive Q-Gray code. The Q-Gray code simplifies the hardware needed to convert analog Q-Gray code signals to digital signals. An analog-to-digital converter (100) can use a plurality of comparators (105) for receiving the multilevel signal and a plurality of decoder blocks (120A, 120B, 120C, 120D) coupled to the comparators (105) for decoding the multi-level signal. Each decoder block (120) can include an equal number of inputs. Each decoder also include a parity detector (110A, 110B, 110C, 110D) with an equal number of inputs. Each decoder block can also employs a bank of identical parity detectors (110) relative to another decoder block (120). Each comparator of the analog-to-digital converter (100) can have an individually or externally adjustable (or both) threshold level.
Inventors:
HIETALA VINCENT MARK
KIM ANDREW JOO
KIM ANDREW JOO
Application Number:
PCT/US2003/006774
Publication Date:
July 22, 2004
Filing Date:
March 07, 2003
Export Citation:
Assignee:
QUELLAN INC (US)
International Classes:
H03M1/06; H03M7/16; H04B14/02; H03M1/08; H03M1/36; (IPC1-7): H03M1/36; H03M7/16
Foreign References:
| US2632058A | 1953-03-17 | |||
| US5300930A | 1994-04-05 | |||
| US5382955A | 1995-01-17 |
Other References:
KAESS ET AL.: "New encoding scheme for high-speed ADC's", IEEE INTERNATIONAL SYMPOSIUM ON CIRCUITS AND SYSTEMS, 9 June 1997 (1997-06-09) - 12 June 1997 (1997-06-12), pages 5 - 8, XP000805329
WAKIMOTO ET AL.: "Si bipolar 2-GHz 6-bit flash A/D conversion LSI", IEEE JOURNAL OF SOLID-STATE CIRCUITS, vol. 23, no. 6, December 1998 (1998-12-01), pages 1345 - 1350, XP000031172
WAKIMOTO ET AL.: "Si bipolar 2-GHz 6-bit flash A/D conversion LSI", IEEE JOURNAL OF SOLID-STATE CIRCUITS, vol. 23, no. 6, December 1998 (1998-12-01), pages 1345 - 1350, XP000031172
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