Sampling switch and controller

Details Sampling switch and controller Sampling switch and controller

2011-06-14

2011-06-14

JeanPierre, Peguy (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

C341S155000

Reexamination Certificate

active

07961132

ABSTRACT:
In one embodiment, an A/D converter samples an analog input signal voltage by applying the input signal to a first capacitor terminal, while a second capacitor terminal is connected to ground via an NMOS sampling switch, to charge the capacitor to the input signal voltage. During an analog-to-digital conversion process, the second capacitor terminal may swing in a voltage range that extends below ground. A controller circuit provides bias voltage signals to a gate terminal and to a p-well of the NMOS sampling switch, to selectively turn the sampling switch on and off. In a first step of a multi-step sampling process, the controller very quickly discharges the gate terminal to ground to isolate a quantity of charge on the second capacitor plate. In a subsequent step of the sampling process, the controller circuit applies a negative voltage to the gate terminal and p-well to ensure that the quantity of change is substantially preserved during the ensuing analog-to-digital conversion process.

REFERENCES:
patent: 6144330 (2000-11-01), Hoffman et al.
patent: 6667707 (2003-12-01), Mueck et al.
patent: 7450041 (2008-11-01), Lin et al.

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