Hochul Kim

Publications (2)0 Total impact

• Conference Proceeding: Sensitivity analysis of direct conversion receivers to Analog-to-Digital Converter performance

  Kye-Shin Lee, Hochul Kim, Joonsung Park
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  ABSTRACT: In this work, the sensitivity of QPSK direct conversion receivers to ADC performance is analyzed. The proposed receiver model with AWGN channel shows how the system BER is affected by major ADC non-idealities including quantization error, offset, 1/f noise, gain/phase error, sampling jitter, and I/Q channel cross-talk. It is shown that the receiver sensitivity to major ADC errors is strongly affected by the modulation scheme of the system. Furthermore, the proposed method can be simply extended to receivers using other modulation schemes such as GMSK or QAM.
  Circuits and Systems, 2009. MWSCAS '09. 52nd IEEE International Midwest Symposium on; 09/2009
• Conference Proceeding: Sigma-delta ADC characterization using noise transfer function pole-zero tracking

  Hochul Kim, Kye-shin Lee
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  ABSTRACT: This work presents a new characterization method for SigmaDelta ADCs using noise transfer function pole zero tracking. In this scheme, the ADC poles and zeros are extracted from the measured FFT-plot. Furthermore, the pole-zero behavior with respect to test conditions including supply voltage, bias current and reference voltage can be analyzed. As a result, the pole-zero sensitivity to each test condition can be separately obtained. This can overcome the drawbacks of the conventional test method which mainly focuses on analyzing the FFT-plots and SNR value.
  Test Conference, 2007. ITC 2007. IEEE International; 11/2007