SungWon Chung

TL;DR: A large-scale monolithic silicon nanophotonic phased array on a chip creates and dynamically steers a high-resolution optical beam in free space, enabling emerging applications in sensing, imaging, and communication.

TL;DR: This work presents a 2.4-GHz asymmetric multilevel outphasing (AMO) power amplifier (PA) with class-E branch amplifiers and discrete supply modulators integrated in a 65-nm CMOS process to achieve improved modulation bandwidth and efficiency over envelope tracking (ET) PAs by replacing the continuous supply modulator with a discrete supplymodulator implemented with a fast digital switching network.

TL;DR: In this paper, a radio frequency (RF) circuit includes a power supply configured to generate a plurality of voltages, a power amplifiers, each having an RF output port and a power input port, a switch network having a multiplicity of input ports coupled to the power supply, and a switch-network output ports coupled with the power amplifier input ports of the plurality of amplifiers.

TL;DR: A new outphasing transmitter architecture in which the supply voltage for each PA can switch among multiple levels based on a new asymmetric multilevel outphase (AMO) modulation technique which increases overall efficiency over a much wider output power range than the standard LINC system while maintaining high linearity.

TL;DR: Geometrical design optimization, at the core of this demonstration, is applicable to the realization of compact thermo-optic devices for large-scale programmable photonic integrated systems, with a potential to reduce power consumption roughly by an order of magnitude without sacrificing scalability and optical modulation bandwidth.