Title:
FILTERING APPLICABLE TO DIGITAL TO ANALOG CONVERTER SYSTEMS
Document Type and Number:
WIPO Patent Application WO2004004120
Kind Code:
A3
Abstract:
Switched-capacitor filter for filtering the output signal of a digital-to-analog converter augmented with Direct Charge Transfer (DCT) techniques. A digital-to-analog converter augmented with DCT and correlated double sampling (CDS) techniques. A digital to analog converter augmented with Postfilter Droop Compensation. In one embodiment, an electronic system includes a digital-to-analog converter (DAC) having a DAC output (Vin); and an analog postfilter having a postfilter input coupled to the DAC output; said analog postfilter (300) including a first direct charge transfer coupled filter said postfilter employing the CDS technique.
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Inventors:
KEEHR EDWARD
WANG SEAN
BAZARJANI SEYFOLLAH
WANG SEAN
BAZARJANI SEYFOLLAH
Application Number:
PCT/US2003/020403
Publication Date:
September 23, 2004
Filing Date:
June 26, 2003
Export Citation:
Assignee:
QUALCOMM INC (US)
International Classes:
H03H19/00; H03M3/00; (IPC1-7): H03H19/00
Foreign References:
| EP0967719A1 | 1999-12-29 | |||
| US6011501A | 2000-01-04 | |||
| US4599573A | 1986-07-08 |
Other References:
NAGARAJ K ET AL: "Switched-capacitor circuits with reduced sensitivity to amplifier gain", IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS, MAY 1987, USA, vol. CAS-34, no. 5, pages 571 - 574, XP002258353, ISSN: 0098-4094
DESSOUKY M ET AL: "Very low-voltage fully differential amplifier for switched-capacitor applications", 2000 IEEE INTERNATIONAL SYMPOSIUM ON CIRCUITS AND SYSTEMS. EMERGING TECHNOLOGIES FOR THE 21ST CENTURY. PROCEEDINGS (IEEE CAT NO.00CH36353), ISCAS 2000 GENEVA. 2000 IEEE INTERNATIONAL SYMPOSIUM ON CIRCUITS AND SYSTEMS. EMERGING TECHNOLOGIES FOR THE 21, 2000, Lausanne, Switzerland, Presses Polytech. Univ. Romandes, Switzerland, pages 441 - 444 vol.5, XP002282739, ISBN: 0-7803-5482-6
DESSOUKY M ET AL: "Very low-voltage fully differential amplifier for switched-capacitor applications", 2000 IEEE INTERNATIONAL SYMPOSIUM ON CIRCUITS AND SYSTEMS. EMERGING TECHNOLOGIES FOR THE 21ST CENTURY. PROCEEDINGS (IEEE CAT NO.00CH36353), ISCAS 2000 GENEVA. 2000 IEEE INTERNATIONAL SYMPOSIUM ON CIRCUITS AND SYSTEMS. EMERGING TECHNOLOGIES FOR THE 21, 2000, Lausanne, Switzerland, Presses Polytech. Univ. Romandes, Switzerland, pages 441 - 444 vol.5, XP002282739, ISBN: 0-7803-5482-6
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