With the smaller layout area and parasitic capacitance under the same electrostatic discharge (ESD) robustness, silicon-controlled rectifier (SCR) has been used as an effective on-chip ESD protection device in radio-frequency (RF) IC. In this paper, SCR's with the waffle layout structures are studied to minimize the parasitic capacitance and the variation of the parasitic capacitance within ult...

The Doherty power amplifier (DPA) is one of the most popular power amplifier architectures for obtaining high average efficiency for modern communication signals with high peak-to-average power ratios (PAPR). However, the DPA suffers from often having narrowband performance which limits its capabilities in wideband and/or multi-standard microwave and radio frequency applications. In this thesis...

With the increasing importance of spectral efficiency in mobile communications, linearity of the RF PA has become a critical design issue for non-constant-envelope digital modulation schemes.1 This issue is particularly significant in spread spectrum applications such as CDMA and wideband CDMA (W-CDMA) base stations, where the peak-to-average ratio of modulated RF signals can vary over a range ...

This paper describes a 0.18 um CMOS wideband multimode LNA for wireless applications, such as WAVE (802.11p), WLAN (802.11a/b/g), WCDMA and Wibro. The circuit topology is a cascode structure with selective input path and wideband output matching for high gain with a low noise figure. By reducing the the quality factor (Q factor) of the narrowband LNA, it can get the flat passband gain. This str...

The recent surge in the demand for low power portable wireless electronics that can offer extremely high data rates has resulted in much active research in Ultra-Wideband (UWB) systems. UWB is widely recognized as a promising technology for high data rate, short-range applications with precise time resolution and high energy efficiency. All these benefits originate from the wideband characteris...