Patents by Inventor Zhongming Shi
Zhongming Shi has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 8571149Abstract: A single chip radio transceiver includes circuitry that enables received wideband RF signals to be down converted to base band frequencies and base band signals to be up converted to wideband RF signals prior to transmission without requiring conversion to an intermediate frequency. The circuitry includes a low noise amplifier, automatic frequency control circuitry for aligning the LO frequency with the frequency of the received RF signals, signal power measuring circuitry for measuring the signal to signal and power ratio and for adjusting frontal and rear amplification stages accordingly, and finally, filtering circuitry to filter high and low frequency interfering signals including DC offset.Type: GrantFiled: June 7, 2010Date of Patent: October 29, 2013Assignee: Broadcom CorporationInventors: Zhongming Shi, Ahmadreza (Reza) Rofougaran, Arya Reza Behzad
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Publication number: 20100248670Abstract: A single chip radio transceiver includes circuitry that enables received wideband RF signals to be down converted to base band frequencies and base band signals to be up converted to wideband RF signals prior to transmission without requiring conversion to an intermediate frequency. The circuitry includes a low noise amplifier, automatic frequency control circuitry for aligning the LO frequency with the frequency of the received RF signals, signal power measuring circuitry for measuring the signal to signal and power ratio and for adjusting frontal and rear amplification stages accordingly, and finally, filtering circuitry to filter high and low frequency interfering signals including DC offset.Type: ApplicationFiled: June 7, 2010Publication date: September 30, 2010Applicant: BROADCOM CORPORATIONInventors: Zhongming Shi, Ahmadreza (Reza) Rofougaran, Arya Reza Behzad
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Patent number: 7733981Abstract: A single chip radio transceiver includes circuitry that enables received wideband RF signals to be down converted to base band frequencies and base band signals to be up converted to wideband RF signals prior to transmission without requiring conversion to an intermediate frequency. The circuitry includes a low noise amplifier, automatic frequency control circuitry for aligning the LO frequency with the frequency of the received RF signals, signal power measuring circuitry for measuring the signal to signal and power ratio and for adjusting frontal and rear amplification stages accordingly, and finally, filtering circuitry to filter high and low frequency interfering signals including DC offset.Type: GrantFiled: July 4, 2008Date of Patent: June 8, 2010Assignee: Broadcom CorporationInventors: Zhongming Shi, Ahmadreza (Reza) Rofougaran, Arya Reza Behzad
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Publication number: 20080267319Abstract: A single chip radio transceiver includes circuitry that enables received wideband RF signals to be down converted to base band frequencies and base band signals to be up converted to wideband RF signals prior to transmission without requiring conversion to an intermediate frequency. The circuitry includes a low noise amplifier, automatic frequency control circuitry for aligning the LO frequency with the frequency of the received RF signals, signal power measuring circuitry for measuring the signal to signal and power ratio and for adjusting frontal and rear amplification stages accordingly, and finally, filtering circuitry to filter high and low frequency interfering signals including DC offset.Type: ApplicationFiled: July 4, 2008Publication date: October 30, 2008Applicant: BROADCOM CORPORATIONInventors: ZHONGMING SHI, AHMADREZA (REZA) ROFOUGARAN, ARYA REZA BEHZAD
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Patent number: 7397868Abstract: A single chip radio transceiver includes circuitry that enables received wideband RF signals to be down converted to base band frequencies and base band signals to be up converted to wideband RF signals prior to transmission without requiring conversion to an intermediate frequency. The circuitry includes a low noise amplifier, automatic frequency control circuitry for aligning the LO frequency with the frequency of the received RF signals, signal power measuring circuitry for measuring the signal to signal and power ratio and for adjusting frontal and rear amplification stages accordingly, and finally, filtering circuitry to filter high and low frequency interfering signals including DC offset.Type: GrantFiled: May 1, 2007Date of Patent: July 8, 2008Assignee: Broadcom CorporationInventors: Zhongming Shi, Ahmadreza (Reza) Rofougaran, Arya Reza Behzad
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Publication number: 20070201565Abstract: A single chip radio transceiver includes circuitry that enables received wideband RF signals to be down converted to base band frequencies and base band signals to be up converted to wideband RF signals prior to transmission without requiring conversion to an intermediate frequency. The circuitry includes a low noise amplifier, automatic frequency control circuitry for aligning the LO frequency with the frequency of the received RF signals, signal power measuring circuitry for measuring the signal to signal and power ratio and for adjusting frontal and rear amplification stages accordingly, and finally, filtering circuitry to filter high and low frequency interfering signals including DC offset.Type: ApplicationFiled: May 1, 2007Publication date: August 30, 2007Applicant: Broadcom CorporationInventors: Zhongming Shi, Ahmadreza (Reza) Rofougaran, Arya Behzad
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Patent number: 7224722Abstract: A single chip radio transceiver includes circuitry that enables received wideband RF signals to be down-converted to baseband frequencies and baseband signals to be up-converted to wideband RF signals prior to transmission without requiring conversion to an intermediate frequency. The circuitry includes a low noise amplifier, automatic frequency control circuitry for aligning a local oscillation frequency with the frequency of the received RF signals, signal power measuring circuitry for measuring the signal to signal and power ratio and for adjusting frontal and rear amplification stages accordingly, and finally, filtering circuitry to filter high and low frequency interfering signals including DC offset.Type: GrantFiled: September 26, 2002Date of Patent: May 29, 2007Assignee: Broadcom CorporationInventors: Zhongming Shi, Ahmadreza Rofougaran, Arya Reza Behzad
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Patent number: 7212586Abstract: A single chip radio transceiver includes circuitry that enables received wideband RF signals to be down converted to base band frequencies and base band signals to be up converted to wideband RF signals prior to transmission without requiring conversion to an intermediate frequency. The circuitry includes a low noise amplifier, automatic frequency control circuitry for aligning the LO frequency with the frequency of the received RF signals, signal power measuring circuitry for measuring the signal to signal and power ratio and for adjusting frontal and rear amplification stages accordingly, and finally, filtering circuitry to filter high and low frequency interfering signals including DC offset.Type: GrantFiled: January 18, 2002Date of Patent: May 1, 2007Assignee: Broadcom CorporationInventors: Zhongming Shi, Reza Rofougaran, Arya Reza Behzad
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Patent number: 7158762Abstract: A single chip radio transceiver includes circuitry that enables received RF signals to be down-converted to baseband frequencies and baseband signals to be up-converted to RF signals prior to transmission without requiring conversion to an intermediate frequency. The circuitry includes a low noise amplifier, automatic frequency control circuitry for aligning the LO frequency with the frequency of the received RF signals, received signal strength indicators for adjusting frontal and rear amplification stages accordingly, and, finally, filtering circuitry to filter high and low frequency interfering signals, including DC offset.Type: GrantFiled: January 10, 2003Date of Patent: January 2, 2007Assignee: Broadcom CorporationInventors: Zhongming Shi, Ahmadreza Rofougaran, Arya Behzad
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Patent number: 7020449Abstract: A variable gain amplifier includes circuit elements that may be partially powered down during transmit modes of operation and that may be powered back up whenever the radio transceiver receives a data packet within a specified settle time even for high throughput RF communications. The radio transceiver circuit may be powered down even in high throughput communications during a transmit mode to reduce power consumption. A DC offset cancellation block is operably coupled to the variable gain block to substantially remove any DC offset from the amplified output. The variable gain amplifier is further able to provide DC offset cancellation within the required settle time by holding the offset value during a dormant mode of operation.Type: GrantFiled: October 21, 2002Date of Patent: March 28, 2006Assignee: Broadcom CorporationInventor: Zhongming Shi
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Publication number: 20040137852Abstract: A single chip radio transceiver includes circuitry that enables received RF signals to be down-converted to baseband frequencies and baseband signals to be up-converted to RF signals prior to transmission without requiring conversion to an intermediate frequency. The circuitry includes a low noise amplifier, automatic frequency control circuitry for aligning the LO frequency with the frequency of the received RF signals, received signal strength indicators for adjusting frontal and rear amplification stages accordingly, and, finally, filtering circuitry to filter high and low frequency interfering signals, including DC offset.Type: ApplicationFiled: January 10, 2003Publication date: July 15, 2004Inventors: Zhongming Shi, Ahmadreza Rofougaran, Arya Behzad
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Publication number: 20040077326Abstract: A variable gain amplifier includes circuit elements that may be partially powered down during transmit modes of operation and that may be powered back up whenever the radio transceiver receives a data packet within a specified settle time even for high throughput RF communications. The radio transceiver circuit may be powered down even in high throughput communications during a transmit mode to reduce power consumption. A DC offset cancellation block is operably coupled to the variable gain block to substantially remove any DC offset from the amplified output. The variable gain amplifier is further able to provide DC offset cancellation within the required settle time by holding the offset value during a dormant mode of operation.Type: ApplicationFiled: October 21, 2002Publication date: April 22, 2004Inventor: Zhongming Shi
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Publication number: 20030138034Abstract: A single chip radio transceiver includes circuitry that enables received wideband RF signals to be down-converted to baseband frequencies and baseband signals to be up-converted to wideband RF signals prior to transmission without requiring conversion to an intermediate frequency. The circuitry includes a low noise amplifier, automatic frequency control circuitry for aligning a local oscillation frequency with the frequency of the received RF signals, signal power measuring circuitry for measuring the signal to signal and power ratio and for adjusting frontal and rear amplification stages accordingly, and finally, filtering circuitry to filter high and low frequency interfering signals including DC offset.Type: ApplicationFiled: September 26, 2002Publication date: July 24, 2003Inventors: Zhongming Shi, Ahmadreza Rofougaran, Arya Reza Behzad
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Publication number: 20030138032Abstract: A single chip radio transceiver includes circuitry that enables received wideband RF signals to be down converted to base band frequencies and base band signals to be up converted to wideband RF signals prior to transmission without requiring conversion to an intermediate frequency. The circuitry includes a low noise amplifier, automatic frequency control circuitry for aligning the LO frequency with the frequency of the received RF signals, signal power measuring circuitry for measuring the signal to signal and power ratio and for adjusting frontal and rear amplification stages accordingly, and finally, filtering circuitry to filter high and low frequency interfering signals including DC offset.Type: ApplicationFiled: January 18, 2002Publication date: July 24, 2003Applicant: Broadcom CorporationInventors: Zhongming Shi, Reza Rofougaran
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Patent number: 6332083Abstract: Apparatus, and an associated method, for the IF stage of a receiver, such as the receive portion of a multi-mode mobile station. Direct conversion of an IF-stage receive signal is made into the digital domain through the use of a &Sgr;&Dgr; analog-to-digital converter. Increased portions of the receiver processes signals in the digital domain using digital-domain circuitry.Type: GrantFiled: March 30, 1999Date of Patent: December 18, 2001Assignee: Nokia Mobile Phones LimitedInventors: Zhongming Shi, Ken Hsu
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Patent number: 5821891Abstract: A demodulator subsystem incorporates second-order filtering for use within a sigma-delta DAC. A conventional demodulator is modified to include circuitry which manifests a second-order filtering response to the output of the demodulator. The added circuitry includes an additional pair of phased switched capacitor legs and a fixed capacitor. The combination of the additional circuitry with the existing phase switched and fixed capacitors of the conventional demodulator creates an additional pole which provides second order filtering to the demodulator output, effectively eliminating the high-order post filtering and minimizing both the circuit area required for implementation of the demodulator and its power consumption.Type: GrantFiled: December 26, 1996Date of Patent: October 13, 1998Assignee: Nokia Mobile Phones, Ltd.Inventors: Zhongming Shi, Ken Hsu, Kim Kaltiokallio