Design and analysis of algorithmic multi-pass A/D converters with the theoretically highest resolution and rate of conversion

Abstract

The paper presents main principles and results of application of a new approach to design and optimisation of the multi-pass analogue-to-digital converters (MP ADCs) with algorithmic forming of estimates codes of an input signal using extended conversion algorithms built on the basis of works [Optimalnaia adaptivnaia sistema ocenki sluchainyh velichin s uchiotom ogranichenii na dinamicheskii diapazon registriruemyh ustroistv, Mezhvuzovski Sbornik Nauchnyh Trudov: Voprosy peredachi i preobrazovania informacii, RRTI, Riazan', 1986, p. 35 (in Russian); Art. Dep. VINITI, no. 7969-B86, 1986, p. 1 (in Russian); IEEE Trans. Signal Process. 42 (9) (1994) 2280; IMEKO XIII World Congress, Torino, Italy, 1994, vol. 2, p. 1025; IEEE Trans. Instrum. Meas. 45 (1) (1996) 60; IEEE Trans. Instrum. Meas. 47 (3) (1998) 659]. These algorithms ensure the maximally efficient suppression of quantisation noise and other noises of analogue part of an MP ADC. The proposed approach allows analytical estimation of the mean square error (MSE) of conversion and effective resolution of the MP ADC and shows the way to achieve its upper boundaries. The simulation analysis of a complete MP ADC model with the extended algorithm confirms the theoretical calculation results. As an example of application of the approach, a possibility of improvement of the characteristics of the two-pass ADC applied in HP 3561 [Hewlett Packard Journal 35 (12) (1984) 12], using digital calculating of estimates and control of conversion process, is considered.