ANALOG-DIGITAL CONVERSION CELL AND ANALOG-DIGITAL CONVERTER
First Claim
1. An analog-digital conversion cell being an analog-digital conversion cell that performs an N-bit analog-digital conversion (where N is a natural number), the analog-digital conversion cell comprising:
- a comparison circuit comparing an analog input signal VI based on a plurality of reference voltages and outputting a first digital code DA selected from Q digital codes (where Q is a natural number equal to or more than 2N+1 and equal to or less than 2N+1−
1) in accordance with a size of the analog input signal VI;
a first logic operation circuit outputting a second digital code DB selected from Q digital codes, which is expressed by DB=DA×
KA+DB0 where a constant KA is a decimal number satisfying a condition of 1<
KA<
2 and DB0 is a constant, based on the first digital code DA; and
an analog operation circuit outputting an analog output signal VO expressed by VO=A×
(VI−
DA×
KA×
(VR/A)) where A and VR are constants, based on the first digital code DA and the analog input signal VI.
1 Assignment
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Accused Products
Abstract
There is provided an analog-digital conversion cell being an analog-digital conversion cell that performs an N-bit analog-digital conversion (where N is a natural number) and including: a comparison circuit (202) comparing an analog input signal VI based on a plurality of reference voltages and outputting a first digital code DA selected from Q digital codes (where Q is a natural number equal to or more than 2N+1 and equal to or less than 2N+1−1) in accordance with a size of the analog input signal VI; a first logic operation circuit (203) outputting a second digital code DB selected from Q digital codes, which is expressed by DB=DA×KA+DB0 where a constant KA is a decimal number satisfying a condition of 1<KA<2 and DB0 is a constant, based on the first digital code DA; and an analog operation circuit (201) outputting an analog output signal VO expressed by VO=A×(VI−DA×KA×(VR/A)) where A and VR are constants, based on the first digital code DA and the analog input signal VI.
4 Citations
19 Claims
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1. An analog-digital conversion cell being an analog-digital conversion cell that performs an N-bit analog-digital conversion (where N is a natural number), the analog-digital conversion cell comprising:
-
a comparison circuit comparing an analog input signal VI based on a plurality of reference voltages and outputting a first digital code DA selected from Q digital codes (where Q is a natural number equal to or more than 2N+1 and equal to or less than 2N+1−
1) in accordance with a size of the analog input signal VI;a first logic operation circuit outputting a second digital code DB selected from Q digital codes, which is expressed by DB=DA×
KA+DB0 where a constant KA is a decimal number satisfying a condition of 1<
KA<
2 and DB0 is a constant, based on the first digital code DA; andan analog operation circuit outputting an analog output signal VO expressed by VO=A×
(VI−
DA×
KA×
(VR/A)) where A and VR are constants, based on the first digital code DA and the analog input signal VI. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification