Coded data generation or conversion – Analog to or from digital conversion – Analog to digital conversion
Patent
1988-07-27
1990-03-06
Shoop, Jr., William M.
Coded data generation or conversion
Analog to or from digital conversion
Analog to digital conversion
341122, 341145, 341155, H03M 146
Patent
active
049070029
ABSTRACT:
In a successive approximation analog to digital converter, an analog signal to be converted to a digital signal is held in a local digital to analog converter. The analog signal thus held is sampled dependent on the bit order of the digital signal, and the sampled analog signal is subjected to a successive bit comparison in a first comparator. A successive approximation register controls the local digital to analog converter to perform the sampling of the held analog signal, and holds the results of the successive bit comparison to provide the digital signal. Second and third comparators compare the analog signal and two reference signals, so that the successive bit comparison is performed from the MSB to the LSB where a voltage of the analog signal is between voltages of the two reference signals, while the successive bit comparison is performed from the second significant bit to the LSB where the analog signal voltage is outside a range between the voltages.
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Kim Helen
NEC Corporation
Shoop Jr. William M.
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