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We present a novel fully differential input/output distributed transformer topology used for the design of millimeter-wave power amplifiers. Input/output distributed transformers are used to feed the input signal to four differential couples and to combine their output power. This topology improves the stability and the efficiency of the power amplifier, minimizing the chip area. The PA prototype...
In this work we present a reconfigurable mid-power class-E power amplifier (PA) operating at ~900 MHz and ~1800 MHz (GSM standard) realized hybridizing one chip manufactured in AMS 0.35 mum CMOS technology and one MEMS sub-network. The CMOS chip realizes the active part of the circuit, whereas the MEMS block (realized in FBK technology) implements a reconfigurable impedance matching network (MN) that...
This paper shows that CMOS Class-E PAs are capable of high Power-Added Efficiency (PAE), even when delivering large output powers at Radio Frequency (RF). In particular, a cascode device is used to obtain high efficiency while assuring reliable operation. A differential solution has been adopted to maximize 2nd harmonic suppression and minimize potential on-chip interference. Prototypes realized in...
The target in the design of CMOS radio-frequency (RF) transceivers for wireless application is the highest integration level, despite reliability issues of conventional submicron MOSFETs, due to high RF voltage and current peaks. In this scenario, this paper investigates gate-oxide breakdown under RF stress by using a class-E power amplifier (PA) for experiments. We showed that maximum RF voltage...
Although technological scaling is beneficial for CMOS ICs for digital applications, it impacts seriously on analog and radio frequency circuit performances. In this scenario, this paper investigates power loss mechanisms in class-E power amplifiers highlighting their dependencies on technological scaling. An analytical model describing PA power added efficiency is obtained, and its results are validated...
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