his paper introduces a 3-level of phase-shift ZVS-PWM with H bridge DC/DC with high power converter at a high-frequency link for arc welding machine. The proposed model has reduced filter size, improved dynamic response and reduced voltage losses on the semiconductor switches. Current doubler circuit is inserted on the secondary side of in a converter, and a high-output current is produced from the secondary-side circuit so, efficiency may be getting better by using current doubler rectifier (CDR). The basics of working the proposed DC/DC converter, test, and analysis are introduced. The power conversion characteristics and power loss analysis are discussed with the marked features. These features create the proposed model suitable for high input current and high voltage applications.

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This manuscript presents the design of a low phase noise, high figure of merit (FoM) single-ended octagonal ring oscillator (RO). The proposed RO employs the pulse injection (PI) technique for performance enhancement. The PI technique is used for suppression of phase noise and spurious harmonics. Besides, a novel voltage dependent phase shifter is employed. The proposed RO has an output signal with voltage controlled phase. Different output signal phases can be obtained employing different selected voltages to control the output signal phase.The proposed injection locked ring oscillator (ILRO) represents a suitable implementation for phase shift keying (PSK). The proposed ILRO has a measured oscillation frequency of 4.9 GHz with a fine tuning range of 500 MHz. It has a measured phase noise of-126.17 dBc/Hz @ 1MHz offset while consuming only 4.8 mW of DC power. The proposed ILRO has a FoM of -193.17 dBc/Hz. This RO has been designed and implemented in 0.18 μm CMOS technology.

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