Title:
MODIFIED PI-SIGMA-DELTA-MODULATOR BASED DIGITAL SIGNAL PROCESSING SYSTEM FOR WIDE-BAND APPLICATIONS
Document Type and Number:
WIPO Patent Application WO/2020/088619
Kind Code:
A1
Abstract:
An apparatus for a signal processor for Wide-Band Applications is provided. The signal processor includes a plurality of parallel branches. Each parallel branch includes a frequency shifter, a sigma-delta-modulator, and a filter. The output signal of each branch is combined via a signal recombiner. The signal processor is suitable for wide-band applications due to centering the zeros of the sigma-delta-modulator's noise transfer function and filter's noise transfer function at the frequency of the frequency shifter in the same branch of the signal processor. Centering these zeros at the frequency of the frequency shifter shapes the quantization noise added by the sigma-delta-modulator away from the input signal frequency to make it easier to remove the quantization noise. This wideband performance is also achieved due to the design of the embodiment's filters. The embodiments of this invention use filters with symmetric transition bands and a pass-band that is wide enough for use in wireless applications.
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Inventors:
KILAMBI SAI MOHAN (CA)
HU LAN (CA)
HU LAN (CA)
Application Number:
PCT/CN2019/114895
Publication Date:
May 07, 2020
Filing Date:
October 31, 2019
Export Citation:
Assignee:
HUAWEI TECH CO LTD (CN)
International Classes:
H04B1/02
Foreign References:
| CN107005206A | 2017-08-01 | |||
| CN106817138A | 2017-06-09 | |||
| CN1820419A | 2006-08-16 |
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