Fast, efficient reference networks for providing...

Details Fast, efficient reference networks for providing... Fast, efficient reference networks for providing...

2008-05-02

2009-12-22

Barnie, Rexford N (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

C327S108000

Reexamination Certificate

active

07636057

ABSTRACT:
Reference network embodiments are provided for use in pipelined signal converter systems. The network embodiments are fast and power efficient and they generate low-impedance reference signals through the use of a complimentary common-drain output stage, an output current valve inserted between transistors of the output stage, and a controller. The controller is configured to provide gate voltages to the output current valve to thereby establish a substantially-constant output current. The controller is further configured to provide gate voltages to the output stage to establish top and bottom reference voltages about the output current valve that are spaced from a common-mode voltage. This reference structure maintains a constant output current as the span between the top and bottom reference voltages is selectively altered. In different embodiments, transistors of the output current valve are arranged in a drain-to-source-coupled configuration and in a source-coupled configuration.

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Maxim Application Note 994, “Reference Voltage for Multiple ADCs”, Maxim Integrated Products, Sunnyvale, California, Mar. 6, 2002, 5 pages.

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