Coded data generation or conversion – Analog to or from digital conversion – Analog to digital conversion
Patent
1993-03-26
1994-11-08
Hoff, Marc S.
Coded data generation or conversion
Analog to or from digital conversion
Analog to digital conversion
341143, H03M 302
Patent
active
053631021
ABSTRACT:
An IC chip formed with an analog-to-digital converter having a switched-capacitor programmable gain stage and employing a switched-capacitor sigma-delta modulator. The chip includes pins to receive a number of different audio input signals which are selectively connectible to buffer amplifiers the outputs of which are directed to a switch to select one output for further processing. The selected buffer amplifier output is d-c coupled to an input signal terminal of a switched-capacitor programmable gain stage. The output of this gain stage is coupled to an output stage including an op-amp and associated switched-capacitor circuitry. The programmable gain stage has a reference input terminal which is connected through an IC chip pin to an external capacitor the other electrode of which is returned to signal common. This capacitor develops a d-c voltage corresponding to the offset voltages of the operative buffer amplifier and the op-amp, and including a component corresponding to charge-injection from MOS switches. Absorption of such d-c voltages by this capacitor prevents those voltages from being significantly gained by the amplifier circuitry, and thereby prevents those voltages from using up an excessive portion of the dynamic range of the circuitry.
REFERENCES:
patent: 4325055 (1982-04-01), Colardelle et al.
patent: 4574250 (1986-03-01), Senderowicz
patent: 4803462 (1989-02-01), Hester et al.
patent: 5057839 (1991-10-01), Koch
patent: 5107266 (1992-04-01), Kim
patent: 5148167 (1992-09-01), Ribner
patent: 5177484 (1993-01-01), Bruckmann
patent: 5220286 (1993-06-01), Nadeem
Analog Devices Inc.
Hoff Marc S.
LandOfFree
Offset-insensitive switched-capacitor gain stage does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Offset-insensitive switched-capacitor gain stage, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Offset-insensitive switched-capacitor gain stage will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1785750