Mao Yu Phones & Addresses
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3319 Loire Ct, San Jose, CA 95135 (408) 425-5977
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Sacramento, CA
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Davis, CA
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Sunnyvale, CA
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Glen Burnie, MD
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South Bend, IN
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3319 Loire Ct, San Jose, CA 95135
Publications
Us Patents
Adc Architecture For Wireless Applications
View pageUS Patent:
7388931, Jun 17, 2008
Filed:
Jun 12, 2002
Appl. No.:
10/170306
Inventors:
Yungping Hsu - Saratoga CA, US
Mao Yu - San Jose CA, US
Mao Yu - San Jose CA, US
Assignee:
Marvell International Ltd. - Hamilton
International Classification:
H04L 27/00
H04L 27/06
H04L 7/00
H04B 7/12
H04L 27/06
H04L 7/00
H04B 7/12
US Classification:
375316, 375340, 375355, 455141
Abstract:
A simplified architecture is disclosed for ADC conversion of received in-phase I and quadrature Q signals. Circuit area is substantially reduced by sharing a single ADC to convert both signals, switching the ADC input alternately between the i and q signals. In an embodiment, the ADC is clocked at an increased sample rate, and the digital output signals are aligned to compensate for the phase difference resulting from the implementation of a single ADC. Aligning includes delaying one of the digital signals, and interpolating the other one of the digital signals in a low pass filter so as to compensate for the phase difference introduced by the sampling during the first and second time intervals. The first and second time intervals are equal to a predetermined ADC sample period corresponding to a sample clock cycle. Delaying the first digital signal includes a delay of 1/2 clock cycle.
Adc Architecture For Wireless Applications
View pageUS Patent:
7835465, Nov 16, 2010
Filed:
May 1, 2008
Appl. No.:
12/150832
Inventors:
Yungping Hu - Saratoga CA, US
Mao Yu - San Jose CA, US
Mao Yu - San Jose CA, US
Assignee:
Marvell International Ltd. - Hamilton
International Classification:
H03K 9/00
H04L 27/00
H04L 27/00
US Classification:
375316, 375324, 375342, 375347, 375350, 375354, 375377
Abstract:
A simplified architecture is disclosed for use in wireless receiver applications, particularly for ADC conversion of received in-phase I and quadrature Q signals. Circuit area is substantially reduced by sharing a single ADC to convert both signals, switching the ADC input alternately between the i and q signals. In an embodiment, the ADC is clocked at an increased sample rate, and the digital output signals are aligned to compensate for the phase difference resulting from the implementation of a single ADC.
Adc Architecture For Wireless Applications
View pageUS Patent:
8031810, Oct 4, 2011
Filed:
Nov 12, 2010
Appl. No.:
12/945035
Inventors:
Yungping Hsu - Saratoga CA, US
Mao Yu - San Jose CA, US
Mao Yu - San Jose CA, US
Assignee:
Marvell International Ltd. - Hamilton
International Classification:
H03K 9/00
H03M 1/00
H03M 1/00
US Classification:
375316, 375324, 375340, 375349, 375350, 375351, 375354, 375377, 341126, 341141, 341155, 708313
Abstract:
An architecture for use in wireless receiver applications, particularly for ADC conversion of received in-phase I and quadrature Q signals. A single ADC is shared to convert both signals, and the ADC input is alternately switched between the i and q signals. In an embodiment, the ADC is clocked at an increased sample rate, and the digital output signals are aligned to compensate for the phase difference resulting from the implementation of the single ADC.
Combined Digital Down Conversion (Ddc) And Decimation Filter
View pageUS Patent:
8331494, Dec 11, 2012
Filed:
Nov 23, 2009
Appl. No.:
12/624353
Inventors:
Mao Yu - San Jose CA, US
Xiangdong Jin - Sunnyvale CA, US
Xiangdong Jin - Sunnyvale CA, US
Assignee:
Marvell International Ltd.
International Classification:
H03K 9/06
US Classification:
375322, 329345
Abstract:
In one embodiment, an analog-to-digital converter (ADC) receives a radio frequency (RF) signal and converts the RF signal into a digital signal at an intermediate frequency. The ADC uses a sampling frequency that is a multiple of the intermediate frequency to perform the conversion. A selector receives the digital signal and outputs a combined in phase and quadrature signal at a plurality of sampling points based on the sampling frequency. A filter receives the combined in phase and quadrature signal and outputs a baseband in phase baseband signal and a baseband quadrature baseband signal.
Buffering Techniques For Rapid Processing Of Samples Of Signals Modulated With Periodic Waveforms
View pageUS Patent:
8514129, Aug 20, 2013
Filed:
Mar 18, 2011
Appl. No.:
13/051114
Inventors:
Chi-Yuen Young - Hong Kong, HK
Mao Yu - San Jose CA, US
Xiangdong Jin - Mountain View CA, US
Mao Yu - San Jose CA, US
Xiangdong Jin - Mountain View CA, US
Assignee:
Marvell International Ltd. - Hamilton
International Classification:
G01S 19/35
US Classification:
34235775
Abstract:
Apparatus having corresponding methods and non-transitory computer-readable media comprise: a sampler configured to sample a signal, wherein the signal is modulated with a waveform having a known period, wherein the sampler obtains K samples in each period, and wherein each of the samples is N bits long, wherein K is an integer greater than 0, and N is an integer greater than 1; a memory bank, wherein the memory bank has M columns and K rows, wherein each column is N bits wide, and wherein M is an integer greater than 0; a write controller configured to write the samples to the memory bank in column order; a read controller configured to read the samples from the memory bank in row order; and an integrator configured to integrate the samples read from the memory bank, wherein the integrator provides a respective integration result for each row.
Analog Bias Control For Packet Communication Systems
View pageUS Patent:
8570887, Oct 29, 2013
Filed:
Nov 11, 2010
Appl. No.:
12/944031
Inventors:
Thomas B. Cho - Fremont CA, US
Li Lin - Saratoga CA, US
Mao Yu - San Jose CA, US
Atul Salhotra - Sunnyvale CA, US
Li Lin - Saratoga CA, US
Mao Yu - San Jose CA, US
Atul Salhotra - Sunnyvale CA, US
Assignee:
Marvell World Trade Ltd. - St. Michael
International Classification:
G01R 31/08
US Classification:
370252, 455208
Abstract:
Apparatus having corresponding methods and non-transitory computer-readable media comprise an amplifier configured to amplify signals according to a bias current, wherein the signals represent packets of data; a packet module configured to recover the packets of data from the signals amplified by the amplifier; and a control module configured to control the bias current according to one or more characteristics of the packets of data.
Method And Apparatus For Detecting Packets
View pageUS Patent:
8634317, Jan 21, 2014
Filed:
May 9, 2011
Appl. No.:
13/103632
Inventors:
Mao Yu - San Jose CA, US
Assignee:
Marvell International Ltd. - Hamilton
International Classification:
H04L 1/16
H04L 12/56
H04L 12/56
US Classification:
370252, 370338
Abstract:
In a method for detecting a duplicate packet in a signal, the signal is received using a receiver. Carrier sense (CS) operations are performed on the received signal in at least each of two frequency bands. Clear channel assessment (CCA) operations are performed on the received signal in the at least each of two frequency bands. A determination whether the received signal corresponds to a packet duplicated in the at least two frequency bands is made based on the CS operations and the CCA operations.
Physical Layer Frame Format For Wlan
View pageUS Patent:
20100260159, Oct 14, 2010
Filed:
Apr 12, 2010
Appl. No.:
12/758603
Inventors:
Hongyuan Zhang - Fremont CA, US
Hui-Ling Lou - Sunnyvale CA, US
Rohit U. Nabar - Sunnyvale CA, US
Sudhir Srinivasa - Sunnyvale CA, US
Mao Yu - San Jose CA, US
Raja Banerjea - Sunnyvale CA, US
Hui-Ling Lou - Sunnyvale CA, US
Rohit U. Nabar - Sunnyvale CA, US
Sudhir Srinivasa - Sunnyvale CA, US
Mao Yu - San Jose CA, US
Raja Banerjea - Sunnyvale CA, US
International Classification:
H04W 4/00
US Classification:
370338
Abstract:
In a method for generating a data unit for transmission via a communication channel, wherein the data unit conforms to a first communication protocol, a preamble of the data unit is generated. The preamble includes a first field having information that indicates a duration of the data unit, the first field being formatted such that the first field is decodable by a receiver device that conforms to a second communication protocol but does not conform to the first communication protocol to determine the duration of the data unit based on the first field. Additionally, the preamble is formatted such that a portion of the preamble is decodable by a receiver device that conforms to a third communication protocol but does not conform to the first communication protocol. Also, the preamble is formatted such that a receiver device that conforms to the first communication protocol can determine that the data unit conforms to the first communication protocol. A data portion of the data unit that conforms to the first communication protocol and does not conform to either (i) the second communication protocol or (ii) the third communication protocol is generated.