| 摘要 |
<p>An A/D converter comprises capacitors (C1, C2, C3, C4, C5) connected with a differential input-differential output amplifier (1) through a plurality of switches. The capacitor (C5) determines the gain of the amplifier (1). A reset level is stored in the capacitor (C1) and a signal level is stored in the capacitor (C2). When one terminal of the capacitor (C1) and one terminal of the capacitor (C2) are connected with respective differential inputs, and the other terminals of the capacitors (C1, C2) are connected with each other, the amplifier (1) generates the differential signal between the reset level and the signal level. Cyclic A/D conversion of the differential signal is performed by switching the capacitors (C1, C2, C3, C4) connected with the differential input-differential output amplifier (1) through a plurality of switches thus obtaining an A/D converted value where random noise is suppressed.</p> |
