Low cost analog to digital converter and a method for...

Details Low cost analog to digital converter and a method for... Low cost analog to digital converter and a method for...

2011-01-18

2011-01-18

JeanPierre, Peguy (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

C341S166000

Reexamination Certificate

active

07872600

ABSTRACT:
The present invention relates to a low cost analog to digital converter (ADC) and a method for converting an analog signal to a digital signal. The method includes the steps of: outputting a pulse modulation signal according to a digital value; performing a low-pass filtering to the pulse modulation signal to obtain a pulse averaged voltage; mixing a first proportion of the pulse averaged voltage and a second proportion of a voltage under test to obtain a composite voltage; comparing the composite voltage with a threshold voltage and adjusting the first digital value such that the composite voltage approaches the threshold voltage; and performing a complement operation to the digital value to obtain an analog to digital value corresponding to the voltage under test.

REFERENCES:
patent: 5337338 (1994-08-01), Sutton et al.
patent: 7242330 (2007-07-01), Alter
patent: 7292081 (2007-11-01), Takegami
patent: 2002/0149505 (2002-10-01), Kanno

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