Spectral regrowth analysis in wideband polar architectures applied to software defined radio

Werquin, Arnaud; Frappé, Antoine; Muller, Jonathan

doi:10.1109/newcas.2011.5981316

Cited by 1 publication

(1 citation statement)

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“…First, polar transmitters perform different processes on the envelope and phase signals. The recombination of the filtered phase and envelope results in attenuated and distorted images as explained in [7]. This effect is represented in Fig.2 where a 2-rate polar system spectrum beside a standard 1-rate polar transmitter are shown.…”

Section: B Polar Transmitter and Impedance Mismatchmentioning

confidence: 96%

A multi-path multi-rate CMOS polar DPA for wideband multi-standard RF transmitters

Werquin¹,

Frappé²

2013

2013 IEEE Radio Frequency Integrated Circuits Symposium (RFIC)

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A two-path digital power amplifier (DPA) in 1.2V 65nm CMOS is presented. This highly reconfigurable and frequency agile block is designed to be used as an envelope modulator in a wideband multi-standard polar transmitter. Each path is composed of a 12-bit DPA ensuring the modulation of the envelope of the RF signal. The DPAs are controlled by envelope code words (ECW) at different sample rates. This diversity strongly attenuates the images produced by the direct digital to RF conversion, avoiding passive filtering. The baseband sample rate conversion can easily be reconfigured. The proposed front-end can manage spurious emissions depending on the standard, the carrier frequency and the required power. The DPAs also integrate active input impedance compensation cells in order to limit the input impedance modulation when switching the DPA cells. The two-path DPA covers a 0.9-1.9 GHz bandwidth with 16.7dBm output 1dB compression point and 12.4% PAE. 64-QAM presents -28dB EVM while active area occupies 1x0.25mm 2 .

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Section: B Polar Transmitter and Impedance Mismatchmentioning

confidence: 96%