Global Patent Index - EP 1095458 A1

EP 1095458 A1 2001-05-02 - SYSTEM FOR GENERATING AN ACCURATE LOW-NOISE PERIODIC SIGNAL

Title (en)

SYSTEM FOR GENERATING AN ACCURATE LOW-NOISE PERIODIC SIGNAL

Title (de)

SYSTEM ZUR ERZEUGUNG EINES GENAUEN RAUSCHARMEN PERIODISCHEN SIGNALS

Title (fr)

SYSTEME DE PRODUCTION D'UN SIGNAL PERIODIQUE PRECIS A FAIBLE BRUIT

Publication

EP 1095458 A1 (EN)

Application

EP 99930808 A

Priority

  • US 9914655 W
  • US 10786898 A

Abstract (en)

[origin: WO0001072A1] In the illustrative embodiment, the inventive system includes a low-bit digital-to-analog converter (68) for converting a first signal at a reference frequency to a digital signal. A delta-sigma converter is included for suppressing noise in the digital signal within the predetermined range of the reference frequency and providing a noise-shaped signal in response thereto. A bandpass filter (72) filters out the out-of-band noise and provides an accurate periodic signal which lacks glitch noise. In a particular embodiment, the inventive system further includes a direct digital synthesizer (42) for providing the first signal at the first frequency and the accurate reference periodic signal is supplied as reference signal to a phase-locked loop (50).

IPC 1-7 (main, further and additional classification)

H03L 7/18; G06F 1/02

IPC 8 full level (invention and additional information)

H03M 3/02 (2006.01); H03L 7/08 (2006.01); H03L 7/18 (2006.01); H03L 7/197 (2006.01); H04B 14/06 (2006.01)

CPC (invention and additional information)

H03L 7/1806 (2013.01)

Citation (search report)

See references of WO 0001072A1

Designated contracting state (EPC)

DE FI FR GB SE

EPO simple patent family

WO 0001072 A1 20000106; AU 4726099 A 20000117; BR 9911733 A 20010403; CA 2336383 A1 20000106; CN 1308789 A 20010815; EP 1095458 A1 20010502; JP 2002519924 A 20020702

INPADOC legal status


2003-07-02 [18D] DEEMED TO BE WITHDRAWN

- Effective date: 20030101

2003-01-15 [RAP1] TRANSFER OF RIGHTS OF AN EP PUBLISHED APPLICATION

- Owner name: QUALCOMM INCORPORATED

2001-07-11 [RIN1] INVENTOR (CORRECTION)

- Inventor name: BUTTERFIELD, DANIEL, KEYES

2001-07-11 [RIN1] INVENTOR (CORRECTION)

- Inventor name: GILMORE, ROBERT, P.

2001-05-02 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 20010115

2001-05-02 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

- Designated State(s): DE FI FR GB SE