H - Electricity – 03 – M
Patent
H - Electricity
03
M
354/88
H03M 1/14 (2006.01) H03M 1/46 (2006.01) H03M 1/68 (2006.01)
Patent
CA 2004317
SUCCESSIVE COMPARISON TYPE ANALOG-TO-DIGITAL CONVERTING APPARATUS ABSTRACT Disclosed is a successive comparison type analog to-digital converter. To attain a reduced size and cost by decreasing the bit number of the D/A converter. The A/D converter copmprises a comparator for comparing an analog input voltage (VIN) and an analog comparison voltage 301 to obtain a digital output signal, wherein, before the analog comparison voltage (Vc) becomes lower than the analog input voltage (VIN) for the first time after the A/D conversion starts, the second digital signal (601) is changed in response to a first clock signal (CLK1) so as to decrease the reference voltage (VREF), and the first digital signal (501) output from the first register (31) is not changed; and after the analog comparison voltage (Vc) becomes lower than the reference voltage (VREF) for the first time after the A/D conversion starts, the second digital signal (601) is not changed so that the reference voltage (VREF) is kept constant, and the first digital signal (501) is changed in response to a second clock signal (CLK2) and in response to the digital output signal (201) from the comparator (11) so as to change the analog comparison voltage (Vc).
Fujitsu Limited
Mcfadden Fincham
LandOfFree
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