The effective bandwidth of optical pre-emphasis in a hybrid modulation laser diode (HMLD) was examined in terms of the CR time constant. The modulation response of the intra-cavity loss modulation (ICLM) section was optically pre-emphasized through a photon-photon resonance (PPR) effect in the HMLD. It was confirmed that the PPR effect is effective up to 500 GHz and can contribute to expanding the modulation bandwidth of the HMLD.

The paper presents a high linearity and wide dynamic range readout integrated circuit (ROIC) for four-quadrant detector (4QD) in position sensitive detection applications. A capacitive transimpedance amplifier (CTIA) was adopted as the basic building block, and a saturation monitoring technique using a comparator and a current mirror (CM) was proposed to adaptively regulate the input photocurrent. The designed readout circuit is fabricated in TSMC 0.18µm 3.3V CMOS process. The simulation results show that the dynamic ranges of proposed ROIC equipped with 5:1 and 2:1 CM are 101.8dB and 93.9dB, respectively. The measurement results demonstrate that an output linearity greater than 99%, and a dynamic range of 85.2dB can be achieved for the proposed ROIC with a 2:1 CM, and 5.9dB improvement was realized compared to the conventional CTIA.

This article proposes a triple-mode modulation wide input voltage range DC-DC buck converter using adaptive power transistor width (APTW) technique, which can be used in low-power applications such as the Internet of Things and automotive chips. This buck converter operates in PWM mode under heavy loads and switches to PFM mode under light loads. Using a load current detection circuit, it enters power-saving mode (PSM) at extremely light loads and adaptively adjusts the power transistor width to minimize circuit losses. The proposed buck converter is designed using a 0.18µm standard CMOS process. Simulation results show that when a 12V standard input voltage is used to generate a 5V output voltage, the efficiency reaches up to 94% for load currents in the 1mA-1A range, and the converter maintains a high efficiency of 80% at light loads of 1mA.

A novel single-stage lighting-emitting diode (LED) driver based on an interleaved buck-boost circuit and an LCC resonant converter is proposed, the two units are integrated together by sharing switches. The interleaved buck-boost circuit operating in discontinuous conduction mode (DCM), which achieve high power factor. The LCC resonant converter is used here ensures that the primary side switches zero voltage switching (ZVS) and the secondary side diodes zero current switching (ZCS), which both reduce the number of semiconductors and increase the overall efficiency. Finally, a 100W LED prototype is designed, fabricated, and test in the laboratory, the experimental results verify the theoretical prediction.

This article investigates an orthogonal decoupling design for two multiple-input multiple-output (MIMO) antennas operating in the co-frequency 2.4GHz Wi-Fi for unbroken housing smartwatch applications. This method is based on the cancellation of the common mode (CM) and differential mode (DM). Two high Q-factor lumped elements are applied to decouple, and they can change the common mode impedance to match the differential mode impedance. The measured results show that maximum in-band isolation of 65.5dB and minimum band edge isolation of 33.9dB at 2.4GHz are attained.

In this paper, an interleaved quadric DC-DC converter with dual coupled inductors is proposed. The interleaved structure at the input end realizes input continuity. At the same time, a dual-coupled structure is introduced, and the secondary side of the dual-coupled inductor and the diode-capacitor (D-C) branch are used to form a scalable voltage multiplier cell. Based on quadratic boost, the gain is further improved the impact of voltage and current is suppressed, the voltage stress of the device is reduced, and zero-current-switching is better achieved. The converter is theoretically analyzed and its performance is compared with other converters. Finally, a 200W experimental prototype was built to complete the experimental verification.