Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1975-10-16
1977-05-10
Miller, Charles D.
Communications: electrical
Audible indication
Percussion-type sound producer
340347AD, H03K 1320
Patent
active
040231607
ABSTRACT:
An analog to digital converter includes a plurality of current sources selectively coupled to a capacitor for charging the capacitor from a reference level with a first reference current in a fixed time period and for discharging the capacitor with a second reference current to the reference level. The capacitor is then charged from the same reference level with a current derived from an unknown voltage source for the same period of time as in the case of the first reference current and discharged to that reference level at the same discharge rate by discharging with the second reference current. The difference between the respective times it takes the capacitor to discharge to the reference level in the two discharge cycles is determined and represents the amplitude of the unknown voltage. Suitable display means provide a digital representation of this amplitude. All the active digital and linear components can be formed on a single semiconductor chip using both PMOS and NMOS enhancement mode transistors in microcircuit form.
REFERENCES:
patent: 3504267 (1970-03-01), James
patent: 3564538 (1971-02-01), Bondzeit
patent: 3566397 (1971-02-01), Walton
patent: 3703001 (1972-11-01), Hibbs
patent: 3733600 (1973-05-01), Hellwarth
patent: 3765012 (1973-10-01), Grutzediek
patent: 3772683 (1973-11-01), Dorey
patent: 3833902 (1974-09-01), Eto
patent: 3913096 (1975-10-01), Veszi
Christoffersen H.
Miller Charles D.
Norton Edward J.
RCA Corporation
Squire William
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