Multi stage resistive ladder network having extra stages for tri

Details Multi stage resistive ladder network having extra stages for tri Multi stage resistive ladder network having extra stages for tri

1980-01-07

1982-07-06

Sloyan, Thomas J.

Communications: electrical

Audible indication

Percussion-type sound producer

338195, 340347DA, 340347M, H03K 1302

Patent

active

043385907

ABSTRACT:
A multi-stage resistive ladder network which uses extra stages to trim out resistance discrepencies. All of the stages are interconnected in a series. Nominally, current is divided in half within each stage. Half of the current is gated onto a bus in response to logic control signals, and the other half of the current is passed onto the next succeeding stage. Due to various processing limitations, the resistors comprising each stage vary slightly from their nominal value, which in turn upsets the current division. To compensate for this additional current dividing stages are serially connected to the last stage of the ladder. Current from these additional stages are selectively coupled onto the bus in response to the logic signals in addition to the current which is normally coupled thereto.

REFERENCES:
patent: 3890610 (1975-06-01), Cahen
patent: 4070665 (1978-01-01), Glennon et al.
patent: 4138671 (1979-02-01), Comer et al.
patent: 4150366 (1979-04-01), Price
The Engineering Staff of Analog Devices, Inc., Analog-Digital Conversion Handbook, 6/1972, pp. I-55 to I-61; II-34 to II-38; II-71 through II-74.
Barnes, First Monolithic 12-Bit DAC Uses A New Zener Trim Technique, Electronic Design 4, 15 Feb. 1977, pp. 34-35.

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