Source: http://www.google.com/patents/US5537113?ie=ISO-8859-1&dq=5708422
Timestamp: 2014-08-31 07:25:28
Document Index: 449398609

Matched Legal Cases: ['art 10', 'art 10', 'arts 151', 'art 10', 'arts 151', 'arts 151', 'art 10', 'arts 151', 'arts 151']

Patent US5537113 - A/D or D/A conversion using distribution of differential waveforms to ... - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign in<nobr>Advanced Patent Search</nobr>PatentsTo implement a high-speed, high-resolution A/D (or D/A) converter, a differential waveform of an analog (or digital) waveform signal is generated by a differential waveform generating part 10, the differential waveform is distributed to N integrators 141 through 14N in a repeating cyclic order at the...http://www.google.com/patents/US5537113?utm_source=gb-gplus-sharePatent US5537113 - A/D or D/A conversion using distribution of differential waveforms to interleaved convertersAdvanced Patent SearchPublication numberUS5537113 APublication typeGrantApplication numberUS 08/196,071Publication dateJul 16, 1996Filing dateJun 15, 1993Priority dateJun 17, 1992Fee statusLapsedAlso published asDE69326528D1, DE69326528T2, EP0601201A1, EP0601201A4, EP0601201B1, WO1993026093A1Publication number08196071, 196071, US 5537113 A, US 5537113A, US-A-5537113, US5537113 A, US5537113AInventorsMasayuki KawabataOriginal AssigneeAdvantest Corp.Export CitationBiBTeX, EndNote, RefManPatent Citations (10), Referenced by (41), Classifications (9), Legal Events (6) External Links: USPTO, USPTO Assignment, EspacenetA/D or D/A conversion using distribution of differential waveforms to interleaved convertersUS 5537113 AAbstract To implement a high-speed, high-resolution A/D (or D/A) converter, a differential waveform of an analog (or digital) waveform signal is generated by a differential waveform generating part 10, the differential waveform is distributed to N integrators 141 through 14N in a repeating cyclic order at the timing of a clock CK0, N being an integer equal to or greater than 2, and the integrator outputs are converted by converting parts 151 through 15N to digital (or analog) signals. These converted outputs are added together by an adder 16, whose output is provided as a digital (or analog) waveform signal.
I claim: 1. An A/D converter for waveform conversion, comprising:differential waveform generating means for generating a differential Waveform of an analog waveform; distributing means for distributing said differential waveform to N sequences of signals one after another, said N being an integer equal to or greater than 2; N converting part means, each composed of a cascade connection of integrating means and A/D converting means, which are respectively supplied with said N sequences of signals and output integrated waveforms of said signals in digital form at the timing displaced in steps of a 1/N period of the distribution cycle; and adding means which adds together the outputs from said N converting part means and provides the added output as a digital waveform. 2. The converter for waveform conversion according to claim 1, wherein timing signal generating means is provided for generating N timing signals which are displaced apart in steps of a 1/N period of the distribution cycle of said distributing means.
TECHNICAL FIELD The present invention relates to an A/D converter and a D/A converter for converting an analog or digital waveform signal to digital or analog waveform signal and, more particularly, to an A/D converter and a D/A converter which implement high-speed, high-resolution waveform conversion through use of a plurality of A/D or D/A conversion parts.
DISCLOSURE OF THE INVENTION The A/D (or D/A) converter for waveform conversion according to the present invention is constructed by: differential waveform generating means for generating a differential waveform of a waveform signal; distributing means for distributing the differential waveform to N converting means in a repeating cyclic order, N being an integer equal to or greater than 2; N converting means each composed of a cascade connection of integrating means and A/D (or D/A) converting means, for outputting a digital integrated waveform (or analog integrated waveform) of the distributed differential waveform; and adding means for adding together the outputs from the N converting means to output a digital converted waveform (or analog converted waveform).
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1A is a block diagram showing an example of a conventional A/D converter adapted for high-speed operation through use of a plurality of A/D converting parts.
BEST MODE FOR CARRYING OUT THE INVENTION FIG. 3 is a theoretical block diagram showing either of the A/D converter and the D/A converter according to the present invention. That is, in the case where a differential waveform ΔS that is output from a differential waveform generating part 10 is an analog signal, converting parts 151 through 15N are all A/D converting parts, and when the differential waveform ΔS is a digital signal, the converting parts 151 through 15N are D/A converting parts. In the present invention the differential value ΔS of the waveform is fed from the differential waveform generating part 10 to a distributor 13. The distributor 13 repeats distributing the differential value ΔS to the N (where N is an integer equal to or greater than 2) integrators 141 through 14N one after another in synchronization with a clock signal CK0 from a timing signal generator 17. The integrators 141 through 14N integrate the differential values distributed thereto and the integrated outputs are A/D or D/A converted by the converting parts 151 through 15N at the timing of clock signals CK1 through CKN. Converted outputs A1 '(t) through AN '(t) from the converting parts 151 through 15N are provided to and added together by an adder 16, and a converted output waveform S' is obtained at a terminal 18. t represents, by integers 0, 1, 2, . . . , discrete points in time every period Δt of the clock signal CK0 that is fed to the distributor 13. Letting the distribution period in the distributor 13 be represented by T, then T=ΔtN.
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2008LAPSLapse for failure to pay maintenance feesJan 21, 2008REMIMaintenance fee reminder mailedDec 22, 2003FPAYFee paymentYear of fee payment: 8Jan 18, 2000FPAYFee paymentYear of fee payment: 4Feb 14, 1994ASAssignmentOwner name: ADVANTEST CORPORATION, JAPANFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:KAWABATA, MASAYUKI;REEL/FRAME:007083/0710Effective date: 19940125RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services©2012 Google