发明授权
- 专利标题: Writable analog reference voltage storage device
- 专利标题(中): 可写模拟参考电压存储器件
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申请号: US622763申请日: 1996-03-25
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公开(公告)号: US5629891A公开(公告)日: 1997-05-13
- 发明人: John LeMoncheck , Timothy P. Allen , Gunter Steinbach , Carver A. Mead
- 申请人: John LeMoncheck , Timothy P. Allen , Gunter Steinbach , Carver A. Mead
- 申请人地址: CA San Jose
- 专利权人: Synaptics, Incorporated
- 当前专利权人: Synaptics, Incorporated
- 当前专利权人地址: CA San Jose
- 主分类号: G05F1/46
- IPC分类号: G05F1/46 ; G05F3/24 ; G11C5/14 ; G11C11/56 ; G11C27/00 ; B11C16/04
摘要:
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.
公开/授权文献
- US5207251A Liquid level sensing method and apparatus 公开/授权日:1993-05-04
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