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In this paper, a novel built-in tuning technique to compensate for variability induced imperfections in RF subsystems is proposed. The test stimulus is obtained from a filtered digital pattern and the RF response is down-converted using an envelope detector. The resulting signal is mapped to a digital signature, such that the Hamming Distance between the observed and the golden signature represents...
Amplitude-to-amplitude (AM-AM) and amplitude-to-phase (AM-PM) distortion are two significant effects in power amplifiers at high output power levels. Traditional measurement of amplitude and phase distortion in RF power amplifiers requires the use of expensive vector network analyzers (VNAs). This paper proposes a low cost and accurate test methodology for AM-AM and AM-PM measurement using distortion-to-amplitude...
In this paper, a novel methodology for post manufacture tuning of RF circuits is presented. The procedure uses an iterative test-tune-test algorithm that applies a compact alternative test to the DUT and modulates circuit level tuning knobs (bias/supply values) based on the DUT specification values predicted from the test. The test procedure is repeated until convergence to the desired spec values...
The recent demand in wireless standards capable of providing short-range, high-speed data transfer has accelerated the growth of the Ultra-Wide Band (UWB) standard. MB-OFDM (Multi Band Orthogonal Frequency Division Multiplexing) UWB devices suffer from frequency dependent non-idealities due to extreme wideband operation (3.1 to 10.6 GHz). Further these characteristics are subjected to process variations...
Outdoor community mesh networks based on IEEE 802.11 have seen tremendous growth in the recent past. The current understanding is that wireless link performance in these settings is inherently unpredictable, due to multipath delay spread. Consequently, researchers have focused on developing intelligent routing techniques to achieve the best possible performance. In this paper, we are specifically...
Modern wireless transceiver systems are designed to operate under worst case channel operating conditions (interference, adjacent channel power, multi-path effects). This results in very tight performance specifications for the front- end RF circuit components. In this paper, we develop an adaptive power management strategy for RF systems that delivers just enough power (and performance) to the RF...
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