Title:
DELTA-SIGMA MODULATOR FOR FRACTIONAL-N FREQUENCY SYNTHESIS
Document Type and Number:
WIPO Patent Application WO2001050611
Kind Code:
A3
Abstract:
A delta sigma modulator which uses at least one quantizer having a dead zone. The dead zone quantizer outputs a zero when its input is within the dead zone range. It outputs a predetermined value if the input is above the dead zone range. If the input is below the dead zone range, the quantizer outputs another predetermined value. Ideally, the quantizer dead zone thresholds are complimentary in that the upper threshold for an input is the positive value of the lower threshold. Also, to save on accumulator bits, the delta sigma modulator selects a predetermined number of most significant bits at different stages.
Inventors:
RILEY THOMAS A D
KWASNIEWSKI TADEUSE A
LEPLEY THIERRY
KWASNIEWSKI TADEUSE A
LEPLEY THIERRY
Application Number:
PCT/CA2001/000019
Publication Date:
November 29, 2001
Filing Date:
January 05, 2001
Export Citation:
Assignee:
CONEXANT SYSTEMS INC (CA)
International Classes:
H03M7/00; H03M3/02; H03M7/32; (IPC1-7): H03M7/00
Domestic Patent References:
| WO2000069074A1 | 2000-11-16 |
Foreign References:
| US5654711A | 1997-08-05 | |||
| US5055802A | 1991-10-08 | |||
| EP0429217A2 | 1991-05-29 |
Download PDF:
Previous Patent: PLL FREQUENCY SYNTHESIZER USING CONTROLLED DIVIDER PULSE WIDTHS
Next Patent: MULTI-RATE, CHANNEL-OPTIMIZED TRELLIS-CODED QUANTIZATION
Next Patent: MULTI-RATE, CHANNEL-OPTIMIZED TRELLIS-CODED QUANTIZATION