Switch capacitor D/A converter having a distortion reducing capa

Details Switch capacitor D/A converter having a distortion reducing capa Switch capacitor D/A converter having a distortion reducing capa

1985-11-01

1987-11-10

Sloyan, T. J.

Communications: electrical

Audible indication

Percussion-type sound producer

324 78E, 340347SH, 340347M, H03M 166

Patent

active

047060662

ABSTRACT:
A D/A converter which converts a one-bit coded signal into an analog signal by means of an integrator comprising an operational amplifier (1) having an output (4) fed back to the inverting input (3) by means of a first capacitor (C.sub.1) and a resistor (R.sub.1). Depending on the value of the one-bit coded signal a positive current pulse or a negative current pulse is applied to the inverting input (3) of the integrator. The positive current pulses are generated by means of a switching network (10) comprising a second capacitor (C.sub.3) which is switched by means of a plurality of switches (S.sub.1 to S.sub.4). The negative current pulses are generated by means of a switching network (20) comprising a third capacitor (C.sub.4) which is switched by a plurality of further switches (S.sub.5 to S.sub.8). In order to ensure that the analog output signal is not distorted as a result of the positive and negative current pulses, a fourth capacitor (C.sub.2) is connected to the inverting input of the integrator. The fourth capacitor has a higher capacitance than each of the other capacitors (C.sub.1, C.sub.3, C.sub.4).

REFERENCES:
patent: 3541446 (1970-11-01), Prozeller
patent: 4009475 (1977-02-01), DeFreitas
patent: 4588983 (1986-05-01), Strong
van de Plassche, A Sigma-Delta Modulator as an A/D Converter, IEEE Transactions on Circuits and Systems, vol. CAS-25, No. 7, 7/1978, pp. 510-514.

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