Built-in self-test of transmitter I/Q mismatch and nonlinearity using self-mixing envelope detector

Afsaneh Nassery, S. Byregowda, Sule Ozev, Marian Verhelst, Mustapha Slamani

Research output: Contribution to journalArticle

8 Scopus citations

Abstract

Built-in self-test (BiST) for transmitters is a desirable choice since it eliminates the reliance on expensive instrumentation to perform radio-frequency signal analysis. Existing on-chip resources, such as power or envelope detectors or small additional circuitry, can be used for BiST purposes. However, due to limited bandwidth, measurement of complex specifications, such as in-phase and quadrature (IQ) imbalance, and third-order intermodulation intercept point (IIP3) is challenging. Since IQ imbalances are most amenable for digital compensation, their characterization and monitoring are desirable. In this paper, we propose a multistep BiST technique for transmitter IQ imbalance and nonlinearity using a self-mixing envelope detector. We derive analytical expressions for the output signal in linear and nonlinear modes. Using linear mode expression, we devise test signals to isolate the effects of gain and phase imbalances, dc offsets, and time skews from other parameters of the system in low-power mode. Once isolated, these parameters are calculated easily with a few mathematical operations. In the next step, using a higher power test signal, the nonlinear behavior of the transmitter is excited and the IIP3 of the transmitter is computed based on the analytical expressions. Simulations and hardware measurements show that the technique can provide accurate characterization of the path.

Original languageEnglish (US)
Article number6851946
Pages (from-to)331-341
Number of pages11
JournalIEEE Transactions on Very Large Scale Integration (VLSI) Systems
Volume23
Issue number2
DOIs
StatePublished - Feb 1 2015

Keywords

  • Built-in self-test (Bist)
  • envelope detector
  • in-phase and quadrature (IQ) imbalance
  • Third-order intercept point (IIP3).

ASJC Scopus subject areas

  • Software
  • Hardware and Architecture
  • Electrical and Electronic Engineering

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