Patent ID: 7843232
Filing Date: 2010-11-30
Classification: G11C

Abstract:
1. A dual mode, single ended to fully differential converter structure, comprising: a differential amplifier having a positive input terminal, a negative input terminal, a positive output terminal and a negative output terminal, the positive output terminal of the differential amplifier coupled to the negative input terminal of the differential amplifier through a first feedback capacitor, the positive input terminal and negative output terminal coupled to a first bypass switch which is operable for bypassing the first feedback capacitor during a sampling phase, the negative output terminal of the differential amplifier coupled to the positive input terminal of the differential amplifier through a second feedback capacitor, the negative input terminal and positive output terminal of the differential amplifier coupled to a second bypass switch which is operable for bypassing the second feedback capacitor during the sampling phase; a first node coupled to a positive input terminal of the converter structure, a first switch, a second switch, a third switch and to a first terminal of a first sampling capacitor, the first switch operable for coupling the positive input terminal of the converter structure to the first node during the sampling phase, the second switch operable for coupling a reference voltage to the first node during the sampling phase, the third switch operable for coupling a common mode voltage to the first node during a transferring phase which occurs after the sampling phase; a second node coupled to a second terminal of the first sampling capacitor, a fourth switch, a fifth switch and a sixth switch, the fourth switch operable for coupling the positive input terminal of the differential amplifier to the second node during the transferring phase, the fifth switch operable for coupling the reference voltage to the second node during the sampling phase, the sixth switch operable for coupling a negative input terminal of the converter structure to the second node during the sampling phase; a third node coupled to the negative input terminal of the converter structure, a seventh switch, an eighth switch, a ninth switch and to a first terminal of a second sampling capacitor, the seventh switch operable for coupling the negative input terminal of the converter structure to the third node during the sampling phase, the eighth switch operable for coupling the reference voltage to the third node during the sampling phase, the ninth switch operable for coupling the common mode voltage to the third node during the transferring phase; and a fourth node coupled to a second terminal of the second sampling capacitor, a tenth switch, a eleventh switch and a twelfth switch, the tenth switch operable for coupling the negative input terminal of the differential amplifier to the fourth node during the transferring phase, the eleventh switch operable for coupling the reference voltage to the fourth node during the sampling phase, the twelfth switch operable for coupling the positive input terminal of the converter structure to the fourth node during the sampling phase.