A 140 GHz high efficiency frequency doubler based on a physical‐based SDD model of SBD

Summary Very‐high‐frequency (VHF) resonant converters have the advantages of small volume, light weight, and high power density. However, under the operating frequency of tens of megahertz, the nonlinear characteristics of the power semiconductor devices intrinsic capacitances will affect the analysis accuracy of VHF converters and increase the difficulty of parameter design of these converters. Thus, this paper proposes a method to obtain the equivalent capacitances of power semiconductor devices. Taking the VHF resonant boost converter as an example, the process of obtaining the equivalent capacitances of power semiconductor devices is elaborated first. And then a prototype with operating frequency 17.30 MHz, input voltage 3–6 V, and output voltage 9–18 V is built to verify the feasibility and effectiveness of the proposed method.

Section: Introductionmentioning

confidence: 99%

Optimal design of VHF resonant boost converter considering the nonlinear characteristic of parasitic capacitance

Zeng

Chen

Zhang

et al. 2023

A terahertz power combining frequency multiplier source based on waveguide magic‐T divider

Wang,

Meng,

Wei

et al. 2024

SummaryThis paper proposes a high‐power solid‐state power combining frequency multiplier source based on a waveguide magic‐T divider. The magic‐T has the merits of high isolation and reliability compared to conventional Y/T junction power dividers and wider bandwidth compared to 3 dB couplers. In the waveguide magic‐T, a two‐stage cuboid ridge is employed to reduce the difference‐port reflection and act as a matching element for the improved isolation port. Furthermore, two bent waveguides are connected with the output port of the magic‐T, which can achieve phase congruence. The reliability of the solid‐state power combining multiplier can be enhanced by this low‐loss, high‐isolation power divider. Moreover, the divider also facilitates the realization of a high‐power frequency multiplier. Measured results show that the multiplier has a maximum output power of 90.3 mW at 178 GHz with an input power of 448 mW.

A 170‐ to 260‐GHz Full‐Band Frequency Doubler Realized by Impedance Compression Matching Technique

Wu,

Zhang,

Wang

et al. 2024

In this paper, the bandwidth limitations of frequency multipliers are analyzed theoretically in terms of maximum power transmission. The analysis shows that due to conjugate with the impedance of the diode itself, the optimum embedded impedance of the diode possesses a counterclockwise impedance trajectory versus frequency on the Smith chart, whereas the matching circuit exhibits a clockwise impedance trajectory versus frequency on the Smith chart. Under this constraint, an impedance compression matching technique (ICMT) is proposed to realize broadband design for terahertz frequency multipliers. Based on the proposed design method, a 170‐ to 260‐GHz full‐band frequency doubler was designed, fabricated, and measured. The measured results show that the doubler achieves an output power of 4–7.5 mW in the entire frequency band under 140‐mW input power, corresponding to a conversion loss of 12.5–15.4 dB.