[특허]Sigma-delta digital-to-analog converter with reduced noise

Sigma-delta digital-to-analog converter with reduced noise 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H03M-003/02
출원번호	US-0004816 (1993-01-15)
발명자 / 주소	Ledzius Robert C. (Austin TX) Irwin James S. (Paige TX)
출원인 / 주소	Motorola, Inc. (Schaumburg IL 02)
인용정보	피인용 횟수 : 150 인용 특허 : 0

초록 ▼

A sigma-delta digital-to-analog converter (DAC) (40) receives oversampled input data representative of an analog signal. The data may be optionally interpolated to a higher rate in a interpolator (41). A noise-shaping sigma-delta modulator (42) is connected to the output of the interpolator (41). The output of the modulator (42) is provided to a finite impulse response (FIR) filter (43). The FIR filter (43) has a frequency response characteristic which reduces the shaped noise and aliased components. This noise has a tendency to intermodulate back into the DAC\s passband. The FIR filter (43) uses a series of flip-flops (81, 82, 83) functioning as delay elements with well-controlled timing edges. The outputs of the flip-flops (81, 82, 83) control current sources (91, 92, 93) weighted according to corresponding filter coefficients. The outputs of the current sources (91, 92, 93) are then summed in a summing device such as an amplifier (101).

대표청구항 ▼

A sigma-delta digital-to-analog converter with reduced noise comprising: a sigma-delta modulator having n input for sequentially receiving first digital data words, a clock input terminal for receiving a modulator clock signal, and an output terminal for providing a modulator output signal having a value in a passband of the digital-to-analog-converter corresponding to said first digital data words; and a finite impulse response (FIR) filter having an input coupled to said output terminal of said sigma-delta modulator, and an output for providing an analog signal; said FIR filter shaping said second analog signal according to a predetermined transfer function, thereby decreasing intermodulated noise in said passband of the sigma-delta digital-to-analog converter, wherein said FIR filter comprises: a plurality of delay elements ordered from a first delay element to a last delay element, said first delay element having an input for receiving said modulator output signal, each delay element besides said first delay element having an input coupled to an output of a preceding delay element, each delay element delaying an input thereof by one period of said modulator clock to provide a delayed signal at an output thereof; a plurality of amplifier means corresponding to each of said plurality of delay elements, each amplifier means having an input coupled to an output of a corresponding one of said plurality of delay elements, and an output, said plurality of delay elements having gains to implement said predetermined transfer function, wherein each of said amplifier means comprises a controlled current source; and a summing device having inputs coupled to each of said output terminals of said plurality of delay elements, and an output terminal for providing said analog signal.

이 특허를 인용한 특허 (150)

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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

내보내기 구분	파일저장 인쇄 메일전송
구성항목	기본정보 상세정보 관리번호, 국가코드, 자료구분, 상태, 출원번호, 출원일자, 공개번호, 공개일자, 등록번호, 등록일자, 발명명칭(한글), 발명명칭(영문), 출원인(한글), 출원인(영문), 출원인코드, 대표IPC 관리번호, 국가코드, 자료구분, 상태, 출원번호, 출원일자, 공개번호, 공개일자, 공고번호, 공고일자, 등록번호, 등록일자, 발명명칭(한글), 발명명칭(영문), 출원인(한글), 출원인(영문), 출원인코드, 대표출원인, 출원인국적, 출원인주소, 발명자, 발명자E, 발명자코드, 발명자주소, 발명자 우편번호, 발명자국적, 대표IPC, IPC코드, 요약, 미국특허분류, 대리인주소, 대리인코드, 대리인(한글), 대리인(영문), 국제공개일자, 국제공개번호, 국제출원일자, 국제출원번호, 우선권, 우선권주장일, 우선권국가, 우선권출원번호, 원출원일자, 원출원번호, 지정국, Citing Patents, Cited Patents
저장형식	Text(ASCII format) Excel format PIAS분석(.xls)
메일정보	받는사람 (필수) @ 보내는사람 (선택) @ 제목 내용 KISTI 검색결과 이메일 서비스
안내	총 건의 자료가 검색되었습니다. 다운받으실 자료의 인덱스를 입력하세요. (1-10,000) 검색결과의 순서대로 최대 10,000건 까지 다운로드가 가능합니다. 데이타가 많을 경우 속도가 느려질 수 있습니다.(최대 2~3분 소요) 다운로드 파일은 UTF-8 형태로 저장됩니다. 파일의 내용이 제대로 보이지 않을실 때는 웹브라우저 상단의 보기 -> 인코딩 -> 자동선택 여부를 확인하십시오. ~ Text(ASCII format) Excel format

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Sigma-delta digital-to-analog converter with reduced noise 원문보기

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연합인증

Sigma-delta digital-to-analog converter with reduced noise 원문보기

초록 ▼

대표청구항 ▼

연구과제 타임라인

전체(0) 논문(0) 특허(0) 보고서(0)

전체(0) 논문(0) 특허(0) 보고서(0)

이 특허를 인용한 특허 (150)

관련 콘텐츠

특허 원문 보기

IPC 상위 출원인

AI-Helper ※ AI-Helper는 오픈소스 모델을 사용합니다.

선택된 텍스트