Delta sigma modulator using a switched capacitor

Details Delta sigma modulator using a switched capacitor Delta sigma modulator using a switched capacitor

1995-06-05

1997-08-19

Gaffin, Jeffrey A.

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

341172, H03M 300

Patent

active

056593147

ABSTRACT:
A delta sigma modulator includes, an addition circuit with 4 switches, an integration circuit, an analog-digital conversion circuit, a delay circuit, and a digital-analog conversion circuit with 2 capacitors and 6 switches. The addition circuit adds an input signal and a feedback signal, the integration circuit integrates the output of the addition circuit, the analog-digital conversion circuit converts the output of the integration circuit into a digital signal, and the delay circuit delays the output digital signal of the analog-digital conversion circuit. The two capacitors of the digital-analog conversion circuit output a charge in accordance with the output of a flip-flop, the four switches supply a power-supply electric potential and the ground electric potential to the two capacitors and also switches with a feedback digital signal and an inverted signal thereof a voltage that is supplied to the two capacitors, and the two switches connect the voltage switched by the four switches and the two capacitors. The output of the delay circuit is decoded to generate the feedback signal that is supplied to the addition circuit.

REFERENCES:
patent: 4920544 (1990-04-01), Endo et al.
patent: 4994804 (1991-02-01), Sakaguchi
patent: 4999634 (1991-03-01), Brazdrum et al.
patent: 5057839 (1991-10-01), Koch
patent: 5159341 (1992-10-01), McCartney et al.

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