Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1981-11-03
1984-10-09
Sloyan, T. J.
Communications: electrical
Audible indication
Percussion-type sound producer
340347CC, H03K 1302
Patent
active
044764561
ABSTRACT:
A sampling switch circuit is provided for an analog to digital converter that provides for the scaling of two switches connected to the converter comparator. The comparator receives two input voltages which are switched to reference voltages. To correct any offset voltage resulting from a mismatch between the switch circuitry, this invention provides for one switch to be attached to a capacitor while the second switch is attached to the capacitive array that digitizes the analog input. These two switches are proportionally fabricated according to the size of their respective capacitive load in order to reduce any voltage difference resulting from the capacitive coupling internal to the switches. The switching circuitry also implements a sequence of switching to correct the offset error from capacitive coupling.
REFERENCES:
Caves et al, A PCM voice codec with on-chip filters, IEEE Journal of Solid-State Circuits, vol. SC-14, No. 1, 2/1979, pp. 65-73.
Boyacigiller et al, An Error-Correcting 14b/20.mu.s CMOS A/D Converter, IEEE International Solid-State Circuit Conference, 1981, pp. 62 & 63.
Merrett Rhys
Sharp Mel
Sloyan T. J.
Texas Instruments Incorporated
Tyson Thomas E.
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