Writable analog reference voltage storage device

Details Writable analog reference voltage storage device Writable analog reference voltage storage device

1994-06-27

1996-07-30

Clawson, Jr., Joseph E.

Static information storage and retrieval

Floating gate

Multiple values

36518521, 36518532, 365177, G11C 1604

Patent

active

055418783

ABSTRACT:
A circuit for generating N analog voltage signals for reference or bias use employs N analog floating gate storage devices. Circuitry is provided so that all floating gate storage devices can be programmed to their target voltages individually or in parallel. Electron injection circuitry is provided for injecting electrons on to and a tunneling structure is provided for removing electrons from the floating gate of each floating gate storage device. A transistor structure with a lightly doped drain is provided for control of the tunneling structure. A capacitor is connected to each floating gate node to provide control of the injection structure. A dynamic analog storage element is provided to store the target voltage for the floating gate storage device. A comparator is provided to monitor the floating gate voltage and target voltage and control tunneling and injection. A digital storage device is provided to statically store the output of the comparator. During normal operation of the voltage reference circuit, the voltage comparator is configured as a follower amplifier to buffer the analog voltage output. During normal operation of the bias reference circuit, the current comparator is configured as a current mirror to buffer the analog current output.

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