Coded data generation or conversion – Converter compensation
Patent
1992-03-31
1994-03-08
Logan, Sharon D.
Coded data generation or conversion
Converter compensation
341136, 341144, H03M 166, H03M 106
Patent
active
052931668
ABSTRACT:
A digital-to-analog (D/A) converter characterized by a decoder which decodes a multi-bit digital input into a plurality of cell activation signals; a converter comprising a number of current cells which can be individually activated by respective cell activation signals; a bias generator which develops a bias voltage for the current cells; and a compensator which compensates the bias voltage to reduce the effects of voltage variations in the power supply. The compensator includes a variation detector coupled to the power supply and develops an error signal when the power supply voltage fluctuates. A variation compensator is responsive to the error signal and is operative to stabilize the bias level. The method of the present invention includes the steps of developing a bias voltage from a power supply, sensing voltage variations in the power supply, and compensating the bias voltage to counteract the effects of the voltage variations.
REFERENCES:
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patent: 4766415 (1988-08-01), Dielacher
patent: 4827260 (1989-05-01), Sugawa et al.
patent: 5023614 (1991-06-01), Fung et al.
patent: 5036322 (1991-07-01), Barrow et al.
patent: 5136293 (1992-08-01), Matsuo et al.
patent: 5146223 (1992-09-01), Muto
Logan Sharon D.
VLSI Technology Inc.
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