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Lorenzo Crespi

from Costa Mesa, CA
Age ~51
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Also known as:
Resdi C Lorenzo
Phone and address:
3488 Queens Ct, Costa Mesa, CA 92626
(714) 617-4269
Connected to:
Christopher L Crespi, 57Craig I Crespi, 39Irving E Crespi, 94Jean M Crespi, 54Ruben F Crespi, 71Ted Crespi, 65Abraham J Crespin, 59Chris Crespin, 42Dwight Crespin, 36Fred A Crespin, 99

Lorenzo Crespi Phones & Addresses

  • 3488 Queens Ct, Costa Mesa, CA 92626 (714) 617-4269
  • 1942 Orange Ave, Costa Mesa, CA 92627 (949) 650-5428
  • Irvine, CA
  • Newport Beach, CA
  • Orange, CA
  • 3488 Queens Ct, Costa Mesa, CA 92626 (949) 689-8995

Work

Company: Conexant Sep 2012 Position: Division director, engineering

Education

Degree: Masters, Master of Science In Electrical Engineering School / High School: Università Di Pavia 1991 to 1997 Specialities: Electrical Engineering

Skills

Mixed Signal • Analog • Cmos • Ic • Semiconductors • Asic • Analog Circuit Design • Soc • Low Power Design • Pll • Power Management • Cadence Virtuoso • Integrated Circuit Design • Spectre • Circuit Design • System on A Chip • Integrated Circuits • Fpga • Rf • Silicon • Systemverilog • Xilinx • Spice • Hardware Architecture • Embedded Systems • Cadence • Microelectronics • Simulations

Languages

Italian

Industries

Semiconductors

Resumes

Resumes

Lorenzo Crespi Photo 1

Division Director, Engineering

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Location:
Costa Mesa, CA
Industry:
Semiconductors
Work:
Conexant
Division Director, Engineering
Conexant Sep 2007 - Sep 2012
Director - Analog Mixed-Signal Design
Education:
Università Di Pavia 1991 - 1997
Masters, Master of Science In Electrical Engineering, Electrical Engineering
Skills:
Mixed Signal
Analog
Cmos
Ic
Semiconductors
Asic
Analog Circuit Design
Soc
Low Power Design
Pll
Power Management
Cadence Virtuoso
Integrated Circuit Design
Spectre
Circuit Design
System on A Chip
Integrated Circuits
Fpga
Rf
Silicon
Systemverilog
Xilinx
Spice
Hardware Architecture
Embedded Systems
Cadence
Microelectronics
Simulations
Languages:
Italian

Business Records

Name / Title
Company / Classification
Phones & Addresses
Lorenzo Crespi
Senior Lead Engineer
Conexant Systems Worldwide, Inc
Mfg Semiconductors/Related Devices
4000 Macarthur Blvd, Newport Beach, CA 92660

Publications

Wikipedia

Lorenzo Crespi

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Lorenzo Crespi, nome d'arte di Vincenzo Leopizzi (Messina, 13 agosto 1971), un attore e personaggio televisivo italiano, interprete di diverse fiction ...

Us Patents

Anti-Pop Circuit

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US Patent:
8063699, Nov 22, 2011
Filed:
Jun 19, 2009
Appl. No.:
12/488438
Inventors:
Xin Fan - Irvine CA, US
Christian Larsen - Irvine CA, US
Lorenzo Crespi - Costa Mesa CA, US
Assignee:
Conexant Systems, Inc. - Newport Beach CA
International Classification:
H03F 1/14
US Classification:
330 51, 330298
Abstract:
Presently many audio chips suffer from pop issues, which is especially serious for single ended audio drivers. An audio pop is a disturbance in the output caused by a sudden transition of chip power, particularly when a chip is powered on or powered off. Furthermore, compensation networks included in the amplifiers on audio chips for stability offer a significant path for transmitting power disturbances to the output. Hence, circuitry is developed to suppress pops in the output stages of an amplifier.

Apparatus And Method For A Smooth Powerup Of A Reference Signal

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US Patent:
8212608, Jul 3, 2012
Filed:
Aug 20, 2010
Appl. No.:
12/860791
Inventors:
Christian Larsen - Irvine CA, US
Gomathi Komanduru - Irvine CA, US
Lorenzo Crespi - Costa Mesa CA, US
Assignee:
Conexant Systems, Inc. - Newport Beach CA
International Classification:
G05F 1/10
G05F 3/02
US Classification:
327541, 327538, 327543, 323314, 323315
Abstract:
A circuit for providing a reference voltage can be widely used in audio applications. However, at startup an abrupt start in the reference signal can cause undesirable audible artifacts. A circuit employing feedback of a reference voltage to control the charging of a capacitor which provides the reference voltage can be used to provide a smooth startup to the reference voltage. The circuit contains a differential pair for steering a fixed current source from one path to another as the reference voltage increases. The steered current can then be mirrored into one or more current mirrors where the newly mirrored current can be squeezed to zero when the difference between a desired reference voltage and the reference voltage approaches zero. This newly mirrored current can be used to charge a capacitor which is used to provide the reference voltage.

Current Detection And Limiting Method And Apparatus

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US Patent:
8274772, Sep 25, 2012
Filed:
Dec 22, 2008
Appl. No.:
12/341753
Inventors:
James Bunde Villadsen Skov - Laguna Niguel CA, US
Lorenzo Crespi - Costa Mesa CA, US
Ketan B. Patel - Lake Forest CA, US
Assignee:
Conexant Systems, Inc. - Newport Beach CA
International Classification:
H02H 9/02
H02H 3/08
US Classification:
361 939, 361 31, 361 87, 361 931
Abstract:
An apparatus for detecting and controlling current. A current detector for generating a first value that represents an amount of current being delivered to a device. A current limit circuit for generating a second value that represents a maximum permitted current level from a current source. A current controller for controlling the amount of current drawn by the device if the first value exceeds the second value.

Power Management Controller For Drivers

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US Patent:
8325940, Dec 4, 2012
Filed:
Dec 19, 2008
Appl. No.:
12/339635
Inventors:
Christian Larsen - Irvine CA, US
Lorenzo Crespi - Costa Mesa CA, US
Mouna Elkhatib - Tustin CA, US
Mary X. Lu - San Jose CA, US
Assignee:
Conexant Systems, Inc. - Newport Beach CA
International Classification:
H04B 15/00
US Classification:
381 945, 381120, 330 10
Abstract:
A driver controller comprising a state machine for controlling transitions between a plurality of states. An output switch for providing a low impedance path to ground during transition periods. An output stage for decoupling output signal from driver amplifier during the transition periods.

Systems And Methods For Offset Cancellation Method For Dc-Coupled Audio Drivers

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US Patent:
8344797, Jan 1, 2013
Filed:
Nov 20, 2009
Appl. No.:
12/623202
Inventors:
Lorenzo Crespi - Costa Mesa CA, US
Christian Larsen - Irvine CA, US
Assignee:
Conexant Systems, Inc. - Newport Beach CA
International Classification:
H03F 1/02
US Classification:
330 9, 381121
Abstract:
Direct current (DC) offset in and audio driver can cause a constant drain on power even when there is no sound. Furthermore it can cause an audible pop when the audio driver is enabled. A scaled replica output stage can be employed to perform DC offset cancellation offline during a sampling phase. Once DC offset cancellation is achieved, the audio driver uses a full scale output stage during the operation phase.

Systems And Methods For Driving High Power States Using Lower Voltage Processes

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US Patent:
8410839, Apr 2, 2013
Filed:
Mar 4, 2011
Appl. No.:
13/041065
Inventors:
Christian Larsen - Irvine CA, US
Lorenzo Crespi - Costa Mesa CA, US
Ketan B. Patel - Lake Forest CA, US
Assignee:
Conexant Systems, Inc. - Newport Beach CA
International Classification:
H03L 5/00
US Classification:
327309, 327333, 326 63, 326 65, 326 66
Abstract:
A battery assisted level shifter comprises a pull up transistor pulling up an output when a received input signal is high, a pull down transistor pulling down the output when the received input signal is low, and a battery element to provide voltage offsets. The battery element can be implemented using one or more pull-up transistors for assisting with pulling up the output. The level shifter can be used in class-D amplifiers, DC-DC power converters and interfaces between circuits having different reference voltages.

Tuning And Dac Selection Of High-Pass Filters For Audio Codecs

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US Patent:
8411877, Apr 2, 2013
Filed:
Oct 13, 2009
Appl. No.:
12/578477
Inventors:
Christian Larsen - Irvine CA, US
Lorenzo Crespi - Costa Mesa CA, US
Mouna Elkhatib - Tustin CA, US
Assignee:
Conexant Systems, Inc. - Newport Beach CA
International Classification:
H03G 5/00
H03G 9/00
US Classification:
381 98, 381102
Abstract:
An integrated audio codec includes a high-pass filter to prevent damage to personal computer speakers and other components. The audio codec may be compliant with HD audio standards and can operate with generic software drivers. Tuning of the high-pass filter is provided through an external pin-out where either an external capacitor or external resistors provide an ability to tune the high-pass filter. In one implementation, a tuning voltage is digitized into a tuning code used by a digital high-pass filter. In addition, multiplexers can be used to insure only the audio path leading to the speakers is filtered.

Apparatus And Method For A Smooth Powerup Of A Reference Signal

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US Patent:
8432148, Apr 30, 2013
Filed:
Jun 15, 2012
Appl. No.:
13/525071
Inventors:
Christian Larsen - Irvine CA, US
Gomathi Komanduru - Irvine CA, US
Lorenzo Crespi - Costa Mesa CA, US
Assignee:
Conexant Systems, Inc. - Newport Beach CA
International Classification:
G05F 3/16
G05F 3/20
US Classification:
323315, 327538, 327540, 323312
Abstract:
A circuit for providing a reference voltage can be widely used in audio applications. However, at startup an abrupt start in the reference signal can cause undesirable audible artifacts. A circuit employing feedback of a reference voltage to control the charging of a capacitor which provides the reference voltage can be used to provide a smooth startup to the reference voltage. The circuit contains a differential pair for steering a fixed current source from one path to another as the reference voltage increases. The steered current can then be mirrored into one ore more current mirrors where the newly mirrored current can be squeezed to zero when the difference between a desired reference voltage and the reference voltage approaches zero. This newly mirrored current can be used to charge a capacitor which is used to provide the reference voltage.

Wikipedia References

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Lorenzo Crespi

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Lorenzo Crespi from Costa Mesa, CA, age ~51 Get Report