RADUCU LAZARESCU

adx0ob@r.postjobfree.com 858-***-****

Experienced RFIC designer with wide coverage on RF transceiver functional blocks: Base-band Filters, Up-conversion and Down-conversion Mixers, mixer Drivers, Voltage Controlled Oscillators, Low Noise Amplifiers, Power Amplifiers. Also developed calibration procedures and circuits for base-band filters, lineup IIP2. Knowledge to develop Receive/Transmit path architectures.

PROFESSIONAL EXPERIENCE

NXP Semiconductors, Irvine CA August 2020 – January 2022

Senior Principal RFIC Design Engineer

- UWB receiver design: RF Mixer circuits, Mixer Driver and IIP2 calibration, Variable-Gain IFgm block, baseband filter

Kumu Networks, Sunnyvale CA February 2019 – August 2019

Consultant

Work under contract:

- designed high-linearity down-conversion mixer + TIA for 250MHz – 6GHz band with IIP3 = +30dBm, NF = 10dB

- designed high-linearity up-conversion mixer for 2.5GHz band with OIP3 = +30dBm and Pout = +6dBm

Energous Corporation, Irvine CA June 2018 – October 2018

Consultant

Work under contract:

- System implementation for a 2.4GHz transmitter

- Base-band pulse generation block design for pulse modulation of a 2.4GHz carrier

- Base-band filter design and calibration

- 2.4GHz up-conversion mixer design

Octotech, Irvine CA June 2017 - September 2017

Principal Engineer

Designed the high-band WiFi LNA and PA power detector

- The 5-to-6GHz LNA was designed to be a standalone device, matched to 50 ohms both at input and output. The design was in the 0.13u CMOS technology with 15dB gain, NF better than 2dB and inp/out reflection coefficients better than 13dB

- Designed all the bias circuits for the LNA

- Designed the high-band PA output power detector with more than four decades dynamic range

Intel Corporation, Santa Clara CA May 2011 - April 2014

Senior Staff Engineer

Raducu Lazarescu, 858-***-**** Page 2

Contributor for the Stone-Peak 802.11ac WiFi module. Implemented the HB (5-6GHz) RFIC circuits.

- Performed RF front-end IC design of the Stone-Peak High-Band WiFi module. The product is in large-volume production (part of module Intel® Dual Band Wireless-AC 7265). Designed transmitter circuits (Mixer and the +26dBm Power Amplifier), Receive/Transmit Switch and receiver circuits (4dB NF LNA and Mixer).

- Architected and modeled with Simulink the All-Digital PLL circuits of SP4011-HD digital FM radio. Detailed design of the TDC circuits.

Siport Inc., Santa Clara CA January 2008 – May 2011

Principal Engineer

Implemented the architecture and detail designed of an HD digital AM/FM/DAB radio receiver (SP4011). The front-end was designed for minimal chip area and power consumption constrains.

- Designed AM input tuning circuits and LNA. Also FM/DAB tuning and LNA circuits.

- Designed common mixer and LO buffer circuits.

- Designed trans-impedance amplifier (base-band VGA) and baseband RC active filter.

- Designed RC calibration and DC offset calibration circuits.

Raducu Lazarescu Consulting Company, Inc. San Diego CA June 2007 - January 2008

Owner

Provide turn-key solutions to different IC development customers.

- Consulted for two clients: all low-headroom LDOs for a TV tunner chip and all output buffers (PECL, LVDS, LVCMOS) for a high performance signal generator chip respectively.

- Two provisional applications for patent: Passive Frequency-Rejection Filter Using Improved-Q technique and Low-Voltage, Low-Noise Direct-Upconverter.

Sequoia Communications, San Diego CA September 2004 – June 2007

Principal Engineer

Technical lead for the RF front-end design of multi-band/multi-standard phone transceiver.

- Led a team of design engineers to insure design performance in all-bands (GSM/EDGE/WCDMA) of the receiver. This front-end was a first pass success and the adopted innovative solutions were key to RF performance of the RFIC. Contributed with ideas, circuits, simulations and lab measurement methodologies to help other senior and junior engineers.

- Designed the WCDMA LNA. Novel architecture for biasing both stages of the LNA to insure low noise and high linearity required by the standard. Novel architecture for on-chip transmit-band rejection circuits and single-to-differential amplifiers.

- New receive-mixer topology for improved linearity and noise, new transmit-driver topology for GSM/EDGE/WCDMA bands of the polar modulator.

- Transmit-band LO buffers, Baseband VGAs and switched-gain output amplifiers.

Raducu Lazarescu, 858-***-**** Page 3

RF Magic, San Diego CA September 2001 - September 2004

Senior Staff Engineer

Designed RFIC’s as broadband radios for delivery of data, voice, video and Internet traffic. The RF Band Translation Switches (BTS) & Channel Stacking Switches (CSS) are in large volume production.

Designed wideband (50 to 850MHz) LNA + harmonic rejection Mixer (3.2nV/ Hz noise, +25dBm input IP3) + LO buffer.

- Designed wideband (1-2GHz) LNA+Mixer+LObuff and 6GHz band LNA, 2dB NF, +10dBm IIP3.

- 24MHz Xtal oscillator and buffers (-140dBc/Hz at 10KHz away from the carrier).

- Patent 6927643: Oscillator Topology for Very Low Phase Noise Operation.

CTS Wireless (former Motorola), Schaumburg IL June 1999 – September 2001

Lead Engineer

Designed and implemented Radio Frequency circuits (Voltage-Controlled Oscillators, phase-locked loops, synthesizers, Power Amplifiers modules) for wireless communication systems. All designed products have extremely low phase noise and are still in large volume production.

- Designed the ATXN1015A dual band (PCS/AMPS) CDMA VCO, ATXN1022 GSM/DCS/PCS Tx Tri Band VCO. Output power 12dBm for GSM and 10dBm for DCS/PCS. Phase noise –110dBc for GSM band and –104dBc for DCS/PCS band at an offset of 25 KHz from the carrier Pulling 1MHz for VSWR=2:1.

- Designed the ATXN1021 Single-Band Voltage-Controlled Oscillator, the KXN1458 Dual-Band (PCS/CDMA) Voltage-Controlled Oscillators with state-of-the-art performance (phase noise: -123dBc/Hz at 60KHz away from the carrier in 1052-1078MHz band, -141dBc/Hz at 1.25MHz away from the carrier in the 2113-2174MHz band, load pulling: +/-1.25MHz for VSWR=2:1, pushing: 0.3MHz/0.1V and 1MHz/0.1V respectively around the 2.8V power supply.

- Patent issued: 6,593,819 “Low phase noise dual band voltage controlled oscillator”.

QUALCOMM INC, San Diego, CA November 1996 - June 1999

Senior Engineer

Design and implement tests for CDMA wireless communication systems.

- Designed the RF part of the PC/AT card for the PCS band CDMA signal source on the board level testers. The circuits contained the I/Q modulator, PLL loops for IF and PCS VCO’s, upconverter and the AGC loop.

- Effort to achieve correlation between the C/N based measurements at board level testing and the FER measurements at CDMA Auto station. Implemented a manual tester for testing the Sinbad boards (subscriber line interface and audio/PCM conversion) of the WLL phones.

EDUCATION

Master of Science in Electronics and Telecommunications

Polytechnic Institute of Bucharest

Faculty of Electronics and Telecommunications

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