H - Electricity
03
M
354/103
H03M 1/00 (2006.01)
Patent
CA 1144653
CODEC ABSTRACT OF THE DISCLOSURE A codec using charge redistribution techniques, which requires substantially reduced chip area as compared to previous codecs of this type, and only one power supply voltage supply to ground, previous codecs requiring two such supplies. The codec is comprised of a first plurality of capacitors having one terminal of each capacitor connected in common, a circuit for switching the common terminal of the capacitors to a first reference voltage, and a circuit for selectively switching the other terminal of each capacitor between a first lead and a second lead. A further circuit selectively switches the first lead between a source of the input signal, the first reference voltage and a high impedance. A second plurality of capacitors has one terminal of each capacitor connected in common. A buffer has its input connected to the common terminal of the second plurality of capacitors, and its output connected to the aforenoted second lead. A switching circuit switches the input of the buffer to the the first reference voltage and a further switching circuit selectively switches the other terminal of each of the second plurality of capacitors to a third or a fourth lead. An additional switching circuit switches the third and fourth leads interchangeably to the first reference voltage and a second reference voltage. Upon switching of sequences of the other terminal of capacitors of the first plurality of capacitors between the first and second leads, a distribution of charge is effected therebetween, and upon switch of sequences of the other terminal of capacitors of the second plurality of capacitors between the third and fourth leads a distribution of charge is effected therebetween. An output circuit carries an output signal from the aforenoted one terminal of the first plurality of capacitors resulting from the distribution of charge between the first capacitors and the distribution of charge between the second capacitors. With the first reference voltage at ground potential, only a single power source voltage is required.
359106
Mitel Corporation
Pascal & Associates
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