GB2266017B - Analogue-to-digital converters - Google Patents

Analogue-to-digital converters

Info

Publication number
GB2266017B
GB2266017B GB9207926A GB9207926A GB2266017B GB 2266017 B GB2266017 B GB 2266017B GB 9207926 A GB9207926 A GB 9207926A GB 9207926 A GB9207926 A GB 9207926A GB 2266017 B GB2266017 B GB 2266017B
Authority
GB
United Kingdom
Prior art keywords
analogue
quantising
noise
converter
digital
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
GB9207926A
Other versions
GB2266017A (en
GB9207926D0 (en
Inventor
Francis Neil Adams
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BAE Systems Electronics Ltd
Original Assignee
GEC Marconi Ltd
Marconi Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by GEC Marconi Ltd, Marconi Co Ltd filed Critical GEC Marconi Ltd
Priority to GB9207926A priority Critical patent/GB2266017B/en
Publication of GB9207926D0 publication Critical patent/GB9207926D0/en
Publication of GB2266017A publication Critical patent/GB2266017A/en
Application granted granted Critical
Publication of GB2266017B publication Critical patent/GB2266017B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M3/00—Conversion of analogue values to or from differential modulation
    • H03M3/30—Delta-sigma modulation
    • H03M3/39—Structural details of delta-sigma modulators, e.g. incremental delta-sigma modulators
    • H03M3/412—Structural details of delta-sigma modulators, e.g. incremental delta-sigma modulators characterised by the number of quantisers and their type and resolution
    • H03M3/422—Structural details of delta-sigma modulators, e.g. incremental delta-sigma modulators characterised by the number of quantisers and their type and resolution having one quantiser only
    • H03M3/424—Structural details of delta-sigma modulators, e.g. incremental delta-sigma modulators characterised by the number of quantisers and their type and resolution having one quantiser only the quantiser being a multiple bit one
    • H03M3/428—Structural details of delta-sigma modulators, e.g. incremental delta-sigma modulators characterised by the number of quantisers and their type and resolution having one quantiser only the quantiser being a multiple bit one with lower resolution, e.g. single bit, feedback

Abstract

In a sigma-delta converter, the digital output converted to analogue form is subtracted, 1, from the analogue input and the differences are integrated in a filter 2 before being passed to the quantising element 3. The quantising noise of the analogue-to-digital converter 3 is thus shaped to produce a minimum in the signal passband. The depth of the minimum can be increased by adding extra filter stages 2, but instability results unless the analogue-to-digital converter 3 is multi-bit. Linearity of reconversion to analogue form requires that the digital to analogue converter 5 must be single bit, which necessitates a second quantising means 6 at which truncation takes place. In accordance with the invention, the quantisation noise of the latter is suppressed by a noise cancellation path 8 at which the quantisation noise of the truncation quantising means 6, is subtracted digitally in the forward path e.g. at the node 9 to allow the benefit of higher order filters to be used without instability i.e. allowing a greater proportion of the sampling bandwidth to be usable for signals. <IMAGE>
GB9207926A 1992-04-10 1992-04-10 Analogue-to-digital converters Expired - Fee Related GB2266017B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9207926A GB2266017B (en) 1992-04-10 1992-04-10 Analogue-to-digital converters

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9207926A GB2266017B (en) 1992-04-10 1992-04-10 Analogue-to-digital converters

Publications (3)

Publication Number Publication Date
GB9207926D0 GB9207926D0 (en) 1992-05-27
GB2266017A GB2266017A (en) 1993-10-13
GB2266017B true GB2266017B (en) 1995-04-19

Family

ID=10713828

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9207926A Expired - Fee Related GB2266017B (en) 1992-04-10 1992-04-10 Analogue-to-digital converters

Country Status (1)

Country Link
GB (1) GB2266017B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6441759B1 (en) * 2000-08-30 2002-08-27 Hrl Laboratories, Llc Multi-bit ΔΣ modulator having linear output
EP1583245A3 (en) * 2004-03-10 2006-09-13 Matsushita Electric Industrial Co., Ltd. Data converter device and data conversion method, and transmitter circuit, communications device and electronic device using the same

Also Published As

Publication number Publication date
GB2266017A (en) 1993-10-13
GB9207926D0 (en) 1992-05-27

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Legal Events

Date Code Title Description
732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20020410