This paper describes application of a complex band-pass (BP) AE DA modulator to I-Q signal generation for I-Q balance testing of communication IC as well as ATE system usage. First we explain that the complex BP AE DA modulator is superior to two real-BP AE DA modulators regarding to noise-shaping characteristics. Then we examine the characteristics of the complex BP AE DA modulator and its extension — a complex multi-BP modulator — as well as its newly derived Data Weighted Averaging (DWA) algorithm for its linearity enhancement. We also propose a digital self-calibration technique, and show their simulation results. Their combination is also investigated. We discuss application of our proposed techniques to IC testing.
['Masahiro Murakami', 'Haruo Kobayashi', 'Shaiful Nizam Mohyar', 'Osamu Kobayashi', 'Takahiro Miki', 'Junya Kojima']
I-Q signal generation techniques for communication IC testing and ATE systems