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A 5GHz all-passive negative feedback network for RF front-end self-steering beam-forming with zero DC power consumption
(2016)2016 IEEE Radio Frequency Integrated Circuits Symposium (RFIC)This paper presents an all-passive negative feedback network to perform autonomous RF front-end beam-forming towards the direction of the incident RF beam. The beam-forming front-end block consists of a passive network for RF signal processing, voltage rectifiers, and voltage-controlled phase shifters, all of which are passive components and consume zero DC power. A proof-of-concept 4-element self-steering beam-forming block at 5GHz is ...Conference Paper -
A multi-feed antenna for antenna-level power combining
(2016)2016 IEEE International Symposium on Antennas and Propagation (APSURSI)This paper proposes a multi-feed antenna structure that synthesizes the desired radiation characteristics with antenna-level power combining. Compared with an antenna array that spatially combines the radiation E-field and H-field at the far-field, the proposed multi-feed antenna combines the radiation power from different feeds directly on the antenna. Such a unique structure occupies a much smaller footprint and offers the flexibility ...Conference Paper -
A compact broadband mixed-signal power amplifier in bulk CMOS with hybrid Class-G and dynamic load trajectory manipulation operations
(2016)2016 IEEE Radio Frequency Integrated Circuits Symposium (RFIC)We present a mixed-signal PA with real-time Class-G and dynamic load trajectory manipulation (DLTM) hybrid operations to achieve PA efficiency enhancement up to the deep power back-off (PBO) region. Moreover, the PA load trajectory is dynamically manipulated to achieve PA efficiency peaking during the PBO operation, and the PA load modulation network is realized by only one on-chip transformer balun for an ultra-compact layout. A prototype ...Conference Paper -
A transformer-based inverted complementary cross-coupled VCO with a 193.3dBc/Hz FoM and 13kHz 1/f3 noise corner
(2016)2016 IEEE Radio Frequency Integrated Circuits Symposium (RFIC)This paper presents a transformer-based inverted complementary cross-coupled voltage-controlled oscillator (VCO) topology. Without compromising the start-up condition, it isolates the source nodes for the cross-coupled devices, suppresses the flicker noise up-conversion, and thus results in a superior phase noise performance. A prototype is implemented in a standard 130nm bulk CMOS process with a core area of 0.34mm 2 . At 1.86GHz, the ...Conference Paper -
A broadband compact low-loss 4$\times$ 4 butler matrix in CMOS with stacked transformer based quadrature couplers
(2016)2016 IEEE MTT-S International Microwave Symposium (IMS)This paper presents an ultra-broadband ultracompact Butler Matrix design scheme. The design employs stacked transformer based couplers and lumped LC π-network phase shifters for substantial size reduction. As a proof-of-concept design, a 4×4 Butler Matrix is implemented in a standard 130nm bulk CMOS process at a center frequency of 2.0 GHz. Compared with reported fully integrated 2.0 GHz 4×4 Butler Matrix designs in CMOS, the proposed ...Conference Paper -
A high-density CMOS multi-modality joint sensor/stimulator array with 1024 pixels for holistic real-time cellular characterization
(2016)2016 IEEE Symposium on VLSI Circuits (VLSI-Circuits)This paper presents a fully integrated 1024-pixel world-first joint multi-modality sensor/stimulator array in CMOS for holistic real-time cell characterization. Each pixel supports extracellular voltage recording, optical detection, and cellular impedance measurement, as well as current-mode cellular stimulation. Four independent on-chip temperature sensors monitor the ambient temperature variation. The chip is implemented in a 130nm CMOS ...Conference Paper -
A fully packaged D-band MIMO transmitter using high-density flip-chip interconnects on LCP substrate
(2016)2016 IEEE MTT-S International Microwave Symposium (IMS)In this paper, a fully packaged D-band MIMO phased-array transmitter using system-on-package (SoP) technology is presented. The transmitter chip is implemented in a 32nm CMOS SOI process and assembled on the liquid crystal polymer (LCP) substrate by flip-chip interconnects. The MIMO operation is enabled by an on-chip transformer based 4×4 Butler Matrix. The package fabrication realizes a consistent minimum feature size of 20µm on a 2-mil ...Conference Paper -
An ultra-compact folded inductor based mm-wave rat-race coupler in CMOS
(2016)2016 IEEE MTT-S International Microwave Symposium (IMS)This paper presents the design scheme of a fully integrated folded inductor based mm-wave rat-race coupler within only one inductor footprint. The detailed circuit analysis and design equations are presented. A proof-of-concept design example at 70 GHz is implemented in a 130nm CMOS process. Compared with other reported rat-race couplers at 60–70GHz, the proposed design achieves a more than 3× size reduction and occupies a core chip area ...Conference Paper -
An N-way transformer based Wilkinson power divider in CMOS
(2016)2016 IEEE MTT-S International Microwave Symposium (IMS)This paper presents a transformer based N-way Wilkinson power divider. The λ/4 transmission lines in a conventional N-way Wilkinson divider are replaced by a fully symmetric N-coil transformer. The proposed design features low insertion loss as well as good input/output matching in an ultracompact chip area. By adding cancellation capacitors, excellent isolation is achieved between any two output ports. Through evenodd mode analysis, the ...Conference Paper -
Mixed-signal Doherty power amplifiers in CMOS
(2016)2016 IEEE MTT-S International Microwave Symposium (IMS)There is an increasing interest to explore novel Doherty power amplifier (PA) architectures by utilizing digitally intensive architectures, i.e., RF power DACs, and mixed-signal techniques. In this paper, we will first review recent mixed-signal PA development. We will then present two mixed-signal Doherty PAs in CMOS. These digitally intensive designs enable precise controls of the Doherty main/auxiliary amplifiers to achieve optimum ...Conference Paper