Complementary low power non-volatile reconfigurable EEcell
First Claim
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1. In a programmable logic device, a configuration cell comprising:
- a common floating gate;
an output node;
a write node;
a control gate;
a p-channel MOS device with a source coupled to a first voltage, a drain coupled to said output node, and a gate coupled to said common floating gate;
an n-channel MOS device with a drain coupled to said output node and to said drain of said p-channel MOS device, a source coupled to a second voltage, a gate coupled to said common floating gate, said MOS devices being coupled together such that in a steady state, only one of said MOS devices conducts;
a tunnel capacitor, for providing charge to and removing charge from said common floating gate, having its first terminal coupled to said common floating gate and its other terminal coupled to said write node; and
a capacitor having its first terminal coupled to said common floating gate and its other terminal coupled to said control gate.
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Abstract
A non-volatile CMOS electrically erasable programmable memory cell for configuring a PLD is disclosed. A CMOS inverter is formed by fabricating an n-channel MOSFET and a p-channel MOSFET with merged floating gate regions. A tunnel capacitor allows charge to be supplied to or removed from the floating gate. The floating gate provides non-volatile charge storage. The CMOS inverter senses the presence or absence of charge on the floating gate and provides an amplified inverted output. The CMOS inverter consumes very low power and provides rail-to-rail output voltage swings.
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Citations
15 Claims
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1. In a programmable logic device, a configuration cell comprising:
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a common floating gate; an output node; a write node; a control gate; a p-channel MOS device with a source coupled to a first voltage, a drain coupled to said output node, and a gate coupled to said common floating gate; an n-channel MOS device with a drain coupled to said output node and to said drain of said p-channel MOS device, a source coupled to a second voltage, a gate coupled to said common floating gate, said MOS devices being coupled together such that in a steady state, only one of said MOS devices conducts; a tunnel capacitor, for providing charge to and removing charge from said common floating gate, having its first terminal coupled to said common floating gate and its other terminal coupled to said write node; and a capacitor having its first terminal coupled to said common floating gate and its other terminal coupled to said control gate. - View Dependent Claims (2)
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3. A configuration cell comprising:
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a common floating gate; an output node; a write node; a control gate; a capacitor for storing charge, having its first terminal coupled to said control gate and its second terminal coupled to said common floating gate; a tunnel capacitor for charging and discharging said common floating gate, having its first terminal coupled to said write node and its second terminal coupled to said common floating gate; an n-channel MOS device having its source coupled to a first voltage node, its substrate coupled to said source, and its drain coupled to said output node and said common floating gate disposed over the channel between the source and the drain; and a p-channel MOS device having its source coupled to a second voltage node, its substrate coupled to said source, its drain coupled to said output node and to said drain of said n-channel MOS device, and said common floating gate disposed over the channel between the source and the drain, said MOS devices being coupled such that in a steady state, only one of said MOS devices conducts. - View Dependent Claims (4, 5)
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6. In a programmable logic device, a configuration cell comprising:
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a control gate; a storage node; a write node; an output node; a p-channel MOSFET with its source connected to a first voltage, its drain connected to said output node, and its gate connected to said storage node; an n-channel MOSFET with its drain connected to said output node and to said drain of said p-channel MOSFET, its source connected to a second voltage and its gate connected to said storage node, said MOSFETS being coupled such that in a steady state, only one of said MOSFETS conducts; a tunnel capacitor, for providing and removing charge from said storage node, having its first terminal connected to said storage node and its other terminal connected to said write node; and a capacitor for storing charge, having its first terminal connected to said storage node and its other terminal connected to said control gate. - View Dependent Claims (7)
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8. A configuration cell comprising:
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a storage node; an output node; a control gate; a write node; a write select node; a write line; a verify line; a verify select node; a CMOS invertor having its input coupled to said storage node and its output coupled to said output node, said invertor being configured such that substantially no power is consumed during normal operation; a capacitor having a first terminal coupled to said storage node and a second terminal coupled to said control gate; a tunnel capacitor having a first terminal coupled to said storage node and a second terminal coupled to said write node; a first pass transistor having a drain coupled to said write node, a gate coupled to said write select node and a source coupled to said write line; and a second pass transistor having a source coupled to said verify line, a gate coupled to said verify select node, and a drain coupled to said output node. - View Dependent Claims (9)
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10. A configuration cell comprising:
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floating gate means for storing charge; programming means including a tunnel capacitor for charging and discharging the floating gate; and means for sensing the charge on the floating gate and providing an amplified output representative of the charge and consuming an amount of power approaching zero. - View Dependent Claims (11, 12, 13, 14, 15)
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Specification