Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1977-02-14
1978-12-26
Sloyan, Thomas J.
Communications: electrical
Audible indication
Percussion-type sound producer
340347DA, 340347M, H03K 1302
Patent
active
041318846
ABSTRACT:
Novel apparatus is described for controlling the application of circuit adjustment signals to an electrical circuit device. The same device leads are used in an operating mode with input signals in a first range, and in an adjustment mode with input signals in a second range, the two ranges being mutually exclusive.
An exemplary embodiment is directed toward trimming a digital to analog converter. A plurality of trimming elements are provided with an equal number of two-terminal actuating devices, which are arranged in a matrix such that each pair of terminals is connected in circuit with a unique pair of input leads. The devices actuate their associated trimming elements in response to the application of actuating signals, exceeding a threshold level greater than the level of the binary input signals, to their respective lead pairs. The leads are thereby capable of a dual mode operation, with one mode for normal converter operation and the other mode for setting up desired trim circuits.
REFERENCES:
patent: 3890610 (1975-06-01), Cahen
patent: 3940760 (1976-02-01), Brokaw
patent: 3961326 (1976-06-01), Craven
The Engineering Staff of Analog Devices, Inc., Analog-Digital Conversion Handbook, 1972, pp. I-54 to I-63, II-40 to II-45, II-64 to II-77.
Erdi, A Precision Trim Technique for Monolithic Analog Circuits, 1975 IEEE International Solid-State Circuits Conference, Digest of Technical Papers, pp. 192, 193.
Precision Monolithics, Inc.
Sloyan Thomas J.
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