Ryan M. Desrosiers - Tigard OR Craig A. Hornbuckle - Torrance CA Harvey L. Berger - Bedondo Beach CA
Assignee:
Northrop Grumman Corporation - Los Angeles CA
International Classification:
H04L 2736
US Classification:
375298, 375296, 375261, 375308, 332103
Abstract:
Methods and devices for predistorted 12/4 Quadrature Amplitude Modulation that compensate for distortion from a nonlinear element. Modulator input bits are mapped ( ) to a plurality of nonreturn-to-zero (NRZ) modulator control bit ( ). The mapping is determined by desired points on a 12/4 QAM constellation. At least one phase shift device ( ) receives an input signal and at least one of the plurality of modulator control bit. At least two quaternary phase shift keying (QPSK) devices ( ) receive phase shifted signals from at least one phase shift device. Each of at least two QPSK devices receives at least one of the plurality of NRZ symbols. An attenuator ( ) that attenuates a first QPSK signal outputted from a first QPSK device of the at least two QPSK devices. A summer ( ) sums the attenuated first QPSK signal with a second QPSK signal. The second QPSK signal is outputted from a second QPSK device of the two QPSK devices.
Hysteretic Switching Regulator With Reduced Switching Frequency Variation
Eric Martin HAYES - Fort Collins CO, US Ryan Desrosiers - Fort Collins CO, US
Assignee:
Broadcom Corporation - Irvine CA
International Classification:
G05F 1/10
US Classification:
323271
Abstract:
Embodiments of a hysteretic switching regulator with reduced switching frequency variation over changes in one or more of input voltage, output voltage, and temperature are provided herein. A frequency adjust controller is specifically used to adjust a parameter of an integrator within the hysteretic switching regulator to compensate for changes in one or more of input voltage, output voltage, and temperature to maintain the switching frequency of the regulator within a narrow frequency range. Limiting the potentially wide switching frequency variation makes filtering of electromagnetic interference (EMI) caused by the switching action of the hysteretic switching regulator more effective and simpler to implement.
Wireless Power Receiver Voltage Control Enabling Simultaneous Communications To Transmitter In Over-Voltage State
- Irvine CA, US Ryan DESROSIERS - Fort Collins CO, US Chia-Jen HSU - Irvine CA, US Desheng MA - Irvine CA, US
Assignee:
BROADCOM CORPORATION - Irvine CA
International Classification:
H02J 50/12 H02J 50/80 H02J 7/02
Abstract:
A wireless power receiver includes circuitry configured to receive a wirelessly induced voltage from a wireless power transmitter via a magnetically induced connection with the wireless power transmitter. It is determined that an overvoltage condition exists when the wirelessly induced voltage exceeds a threshold voltage, and the wirelessly induced voltage is reduced in response to determining that the overvoltage condition exists. The circuitry communicates the overvoltage condition to the wireless power transmitter via the magnetically induced connection while over-voltage protection is enabled.
Wireless Power Transfer Gate-Drive Power Reduction
A device and circuits are provided for wireless power transfer (WPT) gate-drive power reduction. A WPT receiver circuit includes a receive coil to couple to a transmit coil of a WPT transmitter circuit. A rectification circuit is coupled to the receive coil to generate a rectified voltage. The rectification circuit is a bridge rectifier circuit including a first set of field-effect transistors (FETs). One or more gate-drive control circuits improve power dissipation of the rectification circuit by controlling drive voltages of gate terminals of the first set of FET switches after start-up of the WPT receiver circuit.
Wireless Power Transfer Load Modulation Enhancement
- Irvine CA, US Ryan Michael DESROSIERS - Fort Collins CO, US
International Classification:
H02J 50/12 H02J 7/02 H02J 50/90
Abstract:
A wireless power transfer (WPT) receiver circuit includes a receive coil to couple to a transmit coil of a WPT transmitter circuit. A rectifier is coupled to the receive coil to generate a rectified voltage. The rectifier comprises a bridge rectifier circuit including a first set of switching elements. A load modulation circuit facilitates communication between the WPT receiver circuit and the WPT transmitter circuit. The load modulation circuit includes a single modulation capacitor and one or more modulation switching elements. At least one node of one of the modulation switching elements is connected to an input node of the rectifier.
- Irvine CA, US Ryan Michael Desrosiers - Fort Collins CO, US
Assignee:
Broadcom Corporation - Irvine CA
International Classification:
H02J 5/00 H02M 7/217 H01F 38/14
Abstract:
A device includes support for wireless power transfer. The device may control the timing of switching devices in a rectifier circuit and implement resonant tuning techniques that facilitate the wireless power transfer, e.g., by purposefully introducing a real or complex impedance chosen to meet a current operating goal. The device may use the techniques in connection with wireless charging or wireless provision of power to run the device, as examples.
Pre-Charging Mechanism For Multi-Input Switching Charger
- Irvine CA, US Jay Edward Ackerman - Fort Collins CO, US Michael Owen Baker - Fort Collins CO, US Ryan Michael Desrosiers - Fort Collins CO, US
Assignee:
BROADCOM CORPORATION - Irvine CA
International Classification:
H02J 7/00
US Classification:
320137
Abstract:
A circuit for a switching charger includes multiple input supply nodes, and a number of charging paths. Each input supply node is connectable to a power source. Each charging path may include a middle node connected to a coupling switch and a pass transistor. The coupling switch may be configured to activate a corresponding charging path of the charging paths. A pre-charging switch may be coupled to a corresponding middle node of each charging path. The pass transistor of an activated one of the charging paths may be configured to provide a switching voltage at an input of a charging sub-circuit. The pre-charging switch may be configurable to pre-charge a middle node of a non-activated path to a high voltage to prevent an unwanted high current passing through a body diode of a corresponding pass transistor of the non-activated path.
- Irvine CA, US Ryan Michael Desrosiers - Fort Collins CO, US
Assignee:
Broadcom Corporation - Irvine CA
International Classification:
G01R 31/36
US Classification:
324433
Abstract:
Accurate charge measurement based on a calibration factor is described. According to certain aspects, the amount of charge stored in a battery is accumulated over time and adjusted using a calibration factor. In one embodiment, the calibration factor is determined by generating a replica current which comprises a scaled factor of a battery charging current. A calibration reference voltage is measured based on the replica current, and a charge reference voltage is measured based on the battery charging current. A calibration factor is determined based on the charge reference voltage and the calibration reference voltage. In turn, the amount of charge in a battery is accumulated over time using the calibration factor. In various embodiments, the calibration factor provides a factor by which a relatively-low tolerance reference circuit is adjusted, to achieve higher accuracy without substantially increased cost.
Name / Title
Company / Classification
Phones & Addresses
Ryan M. Desrosiers Principal
Desrosiers Inc Business Services at Non-Commercial Site
Broadcom - Fort Collins, Colorado Area since May 2007
Senior Principal Design Engineer
Maxim Integrated Products - Hillsboro, OR Aug 1999 - May 2007
Senior MTS
Education:
Carnegie Mellon University 1994 - 1996
Master of Science (MSc), Semiconductor Manufacturing Technology
Skills:
Circuit Design Wireless Cellular Communications Ic Soc Asic Semiconductors Mixed Signal Cmos Verilog Analog Rtl Design Analog Circuit Design Power Management Integrated Circuit Design