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Two-stage reactively matched gain cells are applied to design a high-gain multi-octave distributed power amplifier (DPA) in this paper. The proposed reactively matched distributed amplifier (RMDA) structure shows a high gain and high output power performance within a small die size. The DC bias network of each section is simplified to implement the proposed structure in an MMIC and the design guide...
This paper proposes a new load insensitive RF power amplifier (PA) for mobile handsets using a load mismatch detection and curing technique. The PA controls a tunable output matching network (TOMN) adaptively based on the information of a mismatched load, thereby enhancing PA performances dramatically at a mismatched load without substantial performance degradation at a matched load. A load mismatch...
A new practical reconfigurable structure for a multi-band power amplifier (PA) is proposed for UMTS handset applications. The proposed reconfigurable output matching network can reconfigure the output power as well as the frequency. It consists of a path-selection network, a power-reconfigurable network, and a frequency-reconfigurable network. To demonstrate the performance of the proposed structure,...
In this paper, we propose a linearization technique combined with an iterative noise cancelation. This method alleviate the effect of added noises which prevent a predistorter (PD) from estimating the exact characteristics of power amplifier (PA). To iteratively cancel the noise included in the feedback signal, the output signal of power amplifier without noise is reconstructed by applying the inverse...
It is well known that high power amplifier (HPA) induces nonlinear distortion around its saturation region. It causes the inter-modulation distortion (IMD) and spectrum re-growth problems. Thus, the digital pre-distortion (DPD) technique is used to improve the linearity of HPA. This paper proposes the adaptive DPD technique, which is composed of a look-up table (LUT) based adaptive update algorithm,...
This paper investigates the reason why the predistorted signal is sampled and feeds back to an adaptation block as reference for digital predistorter (DPD) to be updated in real-time (RT) by comparing a non-real-time (NRT) method with off-time processing. In addition, by deriving a simple algorithm based on gradient descent algorithm with minimum square error criterion, the steady-state condition...
Ultra small-size power amplifier (PA) modules were developed for WCDMA handset applications. To reduce the size of the PA modules, the bulky transmission lines and lumped surface mountable chip elements of the conventional output matching network (OMN) were replaced with the proposed helix-on-pad (HoP) and an integrated passive device (iPD), respectively. Three 2 mm times 2 mm single-band PA modules...
A high-linearity series-type Doherty amplifier that does not use bulky 3 dB quadrature hybrid coupler is developed for mobile handset applications. A predistorter is employed at the input to improve the ACPR performance at the high-power region, which effectively extends maximum linear power range. For size and stability considerations, the phasing circuits between the carrier and peak amplifiers...
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