Multiple ramp procedure with higher order noise shaping

Details Multiple ramp procedure with higher order noise shaping Multiple ramp procedure with higher order noise shaping

1993-04-09

1994-07-05

Young, Brian K.

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

341166, H03M 150

Patent

active

053271378

ABSTRACT:
An analog-to-digital converter operates according to the multiple ramp procedure with continuous integration of the input signal in a charge storage or charge summation circuit, whereby downward integration is performed at periodically recurrent time intervals with the aid of a comparator circuit at the output of the charge storage or charge summation circuit, a logic circuit, a clock oscillator, a switching circuit, a first reference signal and a second reference signal. Hereby the duration of the switched-on state of one of the reference signals is a measure for the input signal. The transfer function of the quantization noise H.sub.q (z) with an n-th order (n=1,2,3, . . . ) high pass filter characteristic can be derived from a transfer function H(z) describing the specified configuration.

REFERENCES:
patent: 4361831 (1982-11-01), Grutzediek et al.
patent: 5066955 (1991-11-01), Scheerer et al.
A. Klauer & M. Pandit, "Processing measurement signals with High-resolution AD-conversion," in Technisches Messen, Nov. '85, kpp. 404-410.

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