Method and apparatus for increasing effective resolution of...

Details Method and apparatus for increasing effective resolution of... Method and apparatus for increasing effective resolution of...

2005-09-27

2005-09-27

Tokar, Michael (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

C341S131000

Reexamination Certificate

active

06950050

ABSTRACT:
In one embodiment, one or more less significant input bits (LSB's) of a digital-to-analog converter (DAC) are pulsed or otherwise modulated at a frequency substantially higher than the response cutoff frequency of a driven analog plant (e.g., a finely positioned mechanical table). The band pass characteristics of the driven analog plant convert the high frequency energy content of the pulses applied to the DAC's input into a smoothed response having a substantially lower frequency (e.g., an essentially DC response). By varying the duty cycle of the high frequency pulses, the system can be controlled to make it appear as if the DAC has a greater number of input bit nodes than it actually has. The analog plant can then be driven with finer resolution than that provided by the limited number of input bit nodes of the DAC.

REFERENCES:
patent: 5805095 (1998-09-01), Humphreys et al.
patent: 5936564 (1999-08-01), Jun
patent: 6016113 (2000-01-01), Binder
patent: 6052076 (2000-04-01), Patton, III et al.
patent: 6281822 (2001-08-01), Park
patent: 6727832 (2004-04-01), Melanson

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