发明授权
US5901085A Programmable reference voltage source, particularly for analog memories
失效
可编程参考电压源,特别适用于模拟存储器
- 专利标题: Programmable reference voltage source, particularly for analog memories
- 专利标题(中): 可编程参考电压源,特别适用于模拟存储器
-
申请号: US941880申请日: 1997-09-30
-
公开(公告)号: US5901085A公开(公告)日: 1999-05-04
- 发明人: Alan Kramer , Roberto Canegallo , Mauro Chinosi , Giovanni Gozzini , Pier Luigi Rolandi , Marco Sabatini
- 申请人: Alan Kramer , Roberto Canegallo , Mauro Chinosi , Giovanni Gozzini , Pier Luigi Rolandi , Marco Sabatini
- 申请人地址: ITX Agrate Brianza (MI)
- 专利权人: STMicroelectronics, S.r.l.
- 当前专利权人: STMicroelectronics, S.r.l.
- 当前专利权人地址: ITX Agrate Brianza (MI)
- 优先权: EPX96830498 19960930
- 主分类号: G11C16/06
- IPC分类号: G11C16/06 ; G05F1/56 ; G11C27/00 ; G11C16/04
摘要:
A programmable reference voltage source includes a nonvolatile memory cell, the floating-gate region of which stores electric charges determining a memorized threshold value. The drain terminal of the cell is biased at a constant voltage, and the source terminal is coupled to a constant-current source and to the inverting input of an operational amplifier having the noninverting input coupled to a reference voltage and the output coupled to the gate terminal of the cell. By defining the threshold of the cell as the gate voltage (measured with respect to ground) capable of causing the cell to be flown by the current set by the current source, the output voltage of the operational amplifier equals the threshold and may be used as a programmable reference in analog memories.