Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1986-01-27
1987-05-19
Sloyan, T. J.
Communications: electrical
Audible indication
Percussion-type sound producer
340347CC, 340347M, 307261, 307262, 323315, 323316, H03M 144
Patent
active
046671803
ABSTRACT:
A continuous time domain parallel analog to digital converter is provided for accomplishing the general successive rectification algorithm I.sub.out =2.vertline.I.sub.in .vertline.-I.sub.ref. One stage of the continuous parallel converter comprises a complimentary transistor pair and three current mirrors. The transistor pair and a first current mirror and a second current mirror act as a rectifier. The complimentary transistor pair has I.sub.in connected to common sources, and common gates connected to ground. A first current mirror has its input connected to the drain of the n-type transistor of the complimentary pair and its output connected to the drain of the p-type transistor. The second current mirror acts as an amplifier by having its input transistors being half the width of the corresponding output transistors. The second mirror has its input connected to the output of the first current mirror, and its output going to I.sub.out. The third current mirror acts to subtract I.sub.ref from the rectified amplified V.sub.in, and has V.sub.ref as an input and an output connected to I.sub.out. The I.sub.out of one stage acts as the I.sub.in to a second stage, and the stages are cascaded. The direction of flow of I.sub.in to each stage provides bits of information. Where a voltage signal is to be converted into digital form, the signal is transformed into a current signal I.sub.in through the use a transconductance amplifier prior to digital conversion by the provided continuous parallel A/D converter.
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General Datacomm, Inc.
Gordon David P.
Sloyan T. J.
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