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Ten years ago, it was widely accepted conventional wisdom that wattlevel fully integrated power amplifiers (PAs) were not feasible in standard complimentary metal-oxide-semiconductor (CMOS) technology. Today millions of such devices are commercially produced and shipped every month and are used in hundreds of millions of cellular phones across the world. Such dramatic transition from being considered...
This paper presents a low-power Class-D stage featuring a new harmonic reduction technique, which cancels the 3rd harmonic and reduces the 5th harmonic. The technique creates a voltage level of VDD/2 from a single supply voltage to shape the drain voltage, uses only digital circuits and eliminates the short-circuit current present in inverter-based Class-D stages. From a single Class-D stage operating...
A CMOS dB-linear RF variable gain amplifier (VGA) that can provide a variable gain of 25-dB is implemented. The 25-dB of this range is achieved by a dB-linear V-I converter, which includes current limiting circuitry to reduce the gain variation due to process and temperature at maximum and minimum output power levels. The circuits are designed in a 0.13-um RF CMOS process. The measurement results...
In this paper, a novel level shifting digital linear amplifier with nonlinear components (LINC) transmitter for OFDM system is presented. By using a multi-level switched power supply, the final power added efficiency is significantly improved compared to a conventional LINC amplifier. Moreover, with digital phase offset cancellation scheme, the transmitter has a good linearity as well. This work was...
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