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A 2.9-GHz LC-VCO based PLL with a fast automatic frequency control (AFC) circuit is proposed. The fast AFC function is achieved by a fourfold reference frequency multiplication and a binary searching algorithm in a 4-bit capacitor array of an LC-VCO and completed in 4-cycles of the reference signal. The simulation results for the proposed PLL designed in a CMOS 130 nm process, show that an AFC time...
A PWM based supply modulator on 180nm CMOS process for a high efficiency envelope tracking transmitter is designed. For high efficiency PWM operation, a ramp generator and a non-overlap clock generator are used. With an LTE 20MHz envelope signal with 7.6dB PAPR, the supply modulator shows efficiency of 72.2% with a resistive load of 2ohm.
A novel design of frequency multiplier using a feedforward technique and a defected ground structure (DGS) is proposed. The feedforward loop in the proposed frequency multiplier suppresses the fundamental component (f0) the dumb-bell or spiral shaped DGS diminish unwanted harmonics such as second, third, fourth. Due to the combination of the feedforward structure and the DGS, only the multiplied frequency...
In this paper, a new predistortion method to reduce nonlinearity of a traveling wave tube amplifiers (TWTAs) is proposed. Nonlinear transfer characteristics of TWTA are analyzed using a carrier complex power series (CCPS). An inverse complex power series of a predistortion linearizer to linearize TWTA are also proposed. The inverse nonlinear distortion characteristics of predistorter can be realized...
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