Open loop common mode driver for switched capacitor input to...

Details Open loop common mode driver for switched capacitor input to... Open loop common mode driver for switched capacitor input to...

2005-10-11

2005-10-11

Wamsley, Patrick (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

C341S163000

Reexamination Certificate

active

06954170

ABSTRACT:
Open loop common mode driver for switched capacitor input to SAR. A unity gain driver amplifier is disclosed for driving an output node that is connected to a capacitive load. The amplifier includes a first stage amplifier for driving an intermediate node, a positive voltage input node for being connected to an input voltage and a negative input node for receiving a feedback signal. A complimentary output stage is provided having an input connected to the intermediate node and an output connected to the output node, a voltage representative of the voltage on the output node fed back to the negative input of said first stage amplifier. Isolation circuitry then isolates the output node from the negative input node of the first stage amplifier as to phase shift due to large values of the capacitive loading during operation of the driver amplifier.

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