Low cost digital-to-analog converter with high precision feedbac

Details Low cost digital-to-analog converter with high precision feedbac Low cost digital-to-analog converter with high precision feedbac

1985-06-28

1987-03-03

Shoop, Jr., William M.

Communications: electrical

Audible indication

Percussion-type sound producer

340347CC, H03K 1305

Patent

active

046479066

ABSTRACT:
An integrated circuit digital-to-analog converter includes a nichrome feedback resistor having .+-.1% accuracy in its output amplifier, a plurality of bit current determining resistors that have .+-.30% manufacturing accuracy, a bias voltage circuit that produces a temperature-compensated bias voltage including an integrated potentiometer that is laser trimmed to compensate for the inaccuracy of the bit current determining resistors. The bit current determining resistors thereby produce constant, precise temperature-independent bit currents. The integrated potentiometer is accurately laser trimmed without changing the series resistance of the potentiometer. This prevents current density changes that change the temperature sensitivity of temperature-compensating elements in the bias voltage circuit.

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patent: 4467312 (1984-08-01), Komatsu
patent: 4523182 (1985-06-01), Harvey et al.
patent: 4529958 (1985-07-01), Person et al.
patent: 4542368 (1985-09-01), Lillis

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