Analog/digital converter of the over-sampling type with feedback

Details Analog/digital converter of the over-sampling type with feedback Analog/digital converter of the over-sampling type with feedback

1992-09-02

1994-09-13

Young, Brian K.

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

341143, H03M 150

Patent

active

053472799

ABSTRACT:
The difference between the output current of a voltage-current converter circuit and the output current of a local D/A converter circuit 2, whose output current is controlled by a feedback signal, is integrated by an analog circuit of which one end is connected to a DC potential point, and the voltage obtained by the integration thereof is quantized by a quantizing circuit. The result is integrated by a digital integrating circuit and is fed to a feedback correcting circuit 6 and, further, the result of A/D conversion is output. The feedback correcting circuit outputs a temporary feedback signal while the digital integration is being operated based on the output of the quantizing circuit. After the digital integrating operation completes the digital integration operation, a corrected feedback signal is generated instead of the temporary feedback signal. The signals inputted into the analog circuit 3 are continuously sampled even while the digital integration operation is being carried out.

REFERENCES:
patent: 5079550 (1992-01-01), Sooch et al.
patent: 5103228 (1992-04-01), Voorman et al.
patent: 5227795 (1991-05-01), Yamakido et al.
M. W. Hauser et al., "Data Converters", Feb. 1985, ISSCC 85, pp. 80-81.
K. Yamakido et al., "Voiceband Telecommunications", ISSCC 86, Feb. 1986, pp. 180-181.
R. Koch et al., "12-bit Sigma-Delta A/D Converter with 15 Mhz Clock Rate", Dec. 1986, IEEE-JSSC, pp. 1003-1009.

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