Digital-to-analog converter

Details Digital-to-analog converter Digital-to-analog converter

1987-07-20

1989-06-06

Shoop, Jr., William M.

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

341144, 341127, H03M 180

Patent

active

048375721

ABSTRACT:
An ultra-fast high resolution digital-to-analog converter (DAC) converts a digital input code into a corresponding analog output voltage. The DAC has an inherent low impedance bipolar output.
In one embodiment, the DAC includes a resistor network coupled to a voltage source for providing a plurality of reference voltages. The DAC comprises a chain of capacitor/switch links each coupled via a pair of terminals, wherein the DAC output voltage appears across the chain. Each capacitor/switch link includes a capacitor, is responsive to a respective bit of the DAC input code and operates to couple the capacitor across the terminals when the bit is high, and connect the terminals when the bit is low. The respective reference voltages are also applied to the capacitors which are discharged only due to parasitic effects. The on-resistances of all individual switches and values of the capacitors employed in the DAC are insignificant.

REFERENCES:
patent: 4200863 (1980-04-01), Hodges et al.
patent: 4749953 (1988-06-01), Gulczynski
patent: 4763106 (1988-08-01), Gulczynski

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