Irvine, California, United States
• RFIC/Analog IC designer with extensive experience in RF front end systems. • Expert in physical and electrical modelling of RF/mmWave systems. • Successfully developed numerous products and sold billions of parts. • Holding numerous US and International patents. Experience in IP development and protection. • Turning sand into gold.
Worked on all IC related aspects of Skyworks' GPS/GNSS family of products carrying Skyworks GPS FEMs to number one position globally and selling around 3 billion parts to date. - Worked closely with marketing team to pick appropriate technologies and design IC, - Continuously worked with foundry partners to adjust processes for best performance and cost, - Monitor new processes and design/ tapeout if necessary, - Worked with MCM and acoustic filter designers overseas to co-design FEMs for best performance, - Worked with quality and reliability teams targeting 100% yield and zero field failures, - Provided FEM for tier-1 customer for eight consecutive years. Designed Skyworks' first Diversity Receiver Front-End Module LNA (DRX FEM) to solve customer's system level problem in a short time: - Designed the LNA die and helped with MCM design, - First die and MCM design went to production with tier-1 customer's top of the line phone model. - Success execution of this project defines a new product category that was acquired by other phone manufacturers. Being the first in the market enables tens of other similar and new products that represents a significant percentage of Skyworks' revenue. Designed a Bluetooth FEM with PA, LNA, and bypass functions. - Digitally controlled dB-linear PA output power of 0-20dBm, - Proposed the architecture and designed the controller die, - Converted class-A PA to class-F improving efficiency, - Designed output harmonic filter to meet regulatory emission standards. mmWave FEM: - Helped with the design of receiver side of a mmWave FEM, - Structure a design methodology for mmWave RF challenges such as stability, - Run 3D sims with EMX and HFSS. IP development: - Worked with attorneys to convert my ideas to patents. - Participated in patent development meetings to help with technical sides and claim construction for other engineers.
o Responsible for Cellular Low-Band Receiver for a 2G/3G/LTE/TD-SCDMA transceiver: • Designed, laid out, and tested LNAs for Cellular Low-Band (728 – 960 MHz). Custom designed inductors and capacitors and performed FEA simulations. Using novel approaches in LNA biasing and coupling area per LNA is reduced to 42% of 3G product and 75% of 2G/TD product with similar specifications and current consumption. The noise figure of the whole chain, from dublexer (or saw) output to ADC input is between 1.6 - 2 dB including low-Q low-cost ceramic matching components. • Custom designed high-Q MOM capacitors that consume 15% less area than regular MOM cap while providing 15% less parasitic substrate capacitance. • Worked on LO chain and mixer to reduce average current consumption while preserving gain, IIP2, and phase noise requirements • Worked on single ended receiver architectures to be used in high-pin count multi-mode multi-band world phone platforms. o Worked on a 26 MHz digitally controlled crystal oscillator circuit. o Worked on an RC delay based VCO of a 1248 MHz PLL that supplies clocks to various block. o Designed, optimized, added functionality, or have familiarity with various other blocks: • Voltage regulators, LDOs, • ESD protection circuits, • Passive mixers, dividers, VCO buffers.
• Design of RF transceiver blocks for next generation cellular phone and wireless technologies. • Responsible for transmitter Low-Band chain (824 – 915 MHz) consisting of the following blocks: . LO-2LO direct conversion GSM/EDGE/WCDMA passive modulator with IM3 of -57 dBc at -13 dBV output voltage, . LO signal chain that consists of divider, buffers, and routing, . Class-A variable gain amplifier with 30 dB dynamic gain range, . 8 dB output power attenuator, and . Low drop-out (LDO) voltage regulators. • Individually studied improving direct conversion mixer linearity. This study provided extensive current savings in the system meeting all the specifications. (PCT Patent Pub. No: WO/2011/002455). • Worked on spurious tone suppression and oscillator output buffer of Digital-PLL.
• Designed and implemented first reported SiC MEMS based oscillator. The 30.2 kHz oscillator exhibits -17 dBm output power with -74 dBc/Hz phase noise at 5 Hz offset using a 10 V bias voltage (Transducers '09). • Characterized 2um thick silicon carbide (SiC) MEMS resonators using FEA and supporting lab experiments. • Hand-on experience with the following materials: SiC, silicon oxycarbide, silicon, silicon dioxide, aluminum wirebond, nickel wirebond, sputtered nickel. • Released SiC MEMS device using low surface tension liquids (instead of expensive supercritical CO2 release). • Upgrade MMR micro probe vacuum chamber to high vacuum environment by installing a turbo pump. • Model nonlinear electro-mechanical properties of SiC MEMS structure using ANSYS and FastCap. • Studied the connection problem of SiC MEMS device and discrete electronics, successfully interface the two using aluminum wirebond and wedge bonder.