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1. (WO2009122656) PIPELINE TYPE A-D CONVERTER

Pub. No.:    WO/2009/122656    International Application No.:    PCT/JP2009/000959
Publication Date: Oct 8, 2009 International Filing Date: Mar 3, 2009
IPC: H03M 1/14
H03M 1/10
Applicants: PANASONIC CORPORATION
パナソニック株式会社
OGITA, Shinichi
荻田進一
KAWABE, Akira
河邉章
KITO, Takayasu
鬼頭崇泰
Inventors: OGITA, Shinichi
荻田進一
KAWABE, Akira
河邉章
KITO, Takayasu
鬼頭崇泰
Title: PIPELINE TYPE A-D CONVERTER
Abstract:
In each stage, a digital signal of a predetermined number of bits is generated from an input analog signal, and an analog reference signal is generated by means of a D-A conversion section (7, 8) based on the generated digital signal, and then a remainder operation is performed on the input analog signal by means of a remainder operation section (9). This A-D converter is so configured as to input a test signal in place of the input analog signal and perform a predetermined test. In the test mode, a controlling section (14a) blocks the supply of the input analog signal to the remainder operation section, and stops the selection of the reference voltage of the D-A conversion section based on the digital signal and, instead, selects the reference voltage based on a D-A conversion control signal for testing, and controls to supply a test signal consisting of a predetermined reference voltage in place of the input analog signal and an analog reference signal to the remainder operation section. Thus, this A-D converter can input a test signal while being remained compact without installing a test signal line separately from a line for normal operation.