Analog-to-digital converter on CMOS with MOS capacitor

Details Analog-to-digital converter on CMOS with MOS capacitor Analog-to-digital converter on CMOS with MOS capacitor

1996-12-16

1998-08-04

Hoff, Marc S.

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

341172, H03M 146

Patent

active

057900639

ABSTRACT:
An analog-to-digital converter is introduced which operates as an oversampled delta-sigma converter. The converter is implemented fully differentially, having doubled integrator capacitors (130, 230), comparators (180, 280), and feedback units (160, 260). In order to reduce the influence of parasitic capacities, the feedback units (160, 260) comprise cascoded switches (171-179). Internal auxiliary signals for controlling the feedback units (160, 260) return to zero at clock frequency. The converter can be used in an integrated signal processing circuit having analog and digital domains on one chip. The capacitors (130, 230) itself are implemented by MOS transistors with the same single poly process as the rest of the circuit. In a second embodiment of the invention, the analog-to-digital converter (500) comprises multiple comparators (580, 572, 573, 574), dynamic matching circuits (801, 802). The comparators (572, 573, 574) can received dithered input signals.

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