PREVIOUS RESEARCH
Low Cost RF Integrated Circuits for Cellular Applications
Low Cost RF Integrated Circuits for Cellular Applications
- Design and development of low cost SAW-less (surface Acoustic Wave filter) RF receivers supporting 2G, 3G, LTE and LTE-CA (carrier aggregation) standards.
- Performed RF system analysis of cellular standards through link budget.
- Designed a new RF receiver for Multi-band and propose the front-end architecture, supporting both inter-band and intra-band carrier aggregation (CA) for LTE applications
- Novel IIP2 (second-order intercept point) calibration scheme is proposed, which can be achieved by controlling body-voltage of transistors. Possible to save and reduce more than 50% calibration time compared to previous gate bias voltage control approaches.
- Additionally proposed a switchable receiver front-end architecture, which can be adaptively selected between voltage-mode and current mode to optimize receiver’s linearity performance. By employing this architecture, several off-chip SAW filters are successfully eliminated in commercial product.
- Designed a new RF receiver for Multi-band and propose the front-end architecture, supporting both inter-band and intra-band carrier aggregation (CA) for LTE applications
Low Cost RF Integrated Circuits for Cellular Applications
Low Cost RF Integrated Circuits for Cellular Applications
- Additionally proposed a switchable receiver front-end architecture, which can be adaptively selected between voltage-mode and current mode to optimize receiver’s linearity performance. By employing this architecture, several off-chip SAW filters are successfully eliminated in commercial product.
- Designed a new RF receiver for Multi-band and propose the front-end architecture, supporting both inter-band and intra-band carrier aggregation (CA) for LTE applications
Low Cost RF Integrated Circuits for WLAN Application
Low Cost RF Integrated Circuits for WLAN Application
- Design and development of RF receiver front-end and several self-calibration schemes for low cost design.
- Performed system analysis and physical circuit design for the feasibility test of self-calibration schemes employing loopback paths and implemented tone generator.
- Successively delivered Qualcomm’s second WIFI SOC (system-on-chip) chipset (WCN1314)
- More than 95% yield is achieved, which is the highest number (2009), specifically for RF products.
Low Cost and High linear RF Integrated Circuits for GPS (Global Positioning System)
Low Cost and High linear RF Integrated Circuits for GPS (Global Positioning System)
- Design and development of high linear GPS receiver, implemented with cellular design within one silicon die.
- Automatic interferer detection (AID) are first applied such that receiver can be operated in high linear mode whenever undesired interferer is applied at receiver input.
- Contributed the development and commercialization of Qualcomm’s world first cellular and GPS combination chipset (RTR8600)
Power Efficient RF Integrated Circuits Design for Sensor Applications
Power Efficient RF Integrated Circuits Design for Sensor Applications
- Design and analysis of novel RF receiver architecture, which is applicable to Zigbee standard (IEEE802.15.4)
- Design and analysis of novel RF receiver architecture, which is applicable to Zigbee standard (IEEE802.15.4)
- Newly proposed recursive receiver architectures utilizing multiband feedback approaches and provided theoretical performance analysis, suitable for several sensor applications as well as Zigbee applications. By employing these topologies, power efficiency of the receiver can be enhanced more than 100% without designing extra amplification stages.
- Best paper award received from the Journal of Solid-State Circuits (JSSC) 2008
System Design of RF Front-End Architecture for Digital RF Applications
System Design of RF Front-End Architecture for Digital RF Applications
- System design of novel RF ADC (analog-to-digital converter) for digital RF GSM application.
- Verified and proved the feasibility of receiver chains including RF front-end and sigma-delta ADC through MATLAB SIMULINK.
Low Power RF Integrated Circuit Design for UWB (Ultra WideBand) Standard
Low Power RF Integrated Circuit Design for UWB (Ultra WideBand) Standard
- Design of low power RF receiver for OFDM-based Ultra Wideband using SiGe process.
- Evaluated and Verified novel LNA (low noise amplifier) to support wideband input matching conditions, ranging from 3 to 9 GHz.