Rectifying charge storage memory circuit

• US 7,310,264 B2
• Filed: 03/16/2006
• Issued: 12/18/2007
• Est. Priority Date: 11/28/2000
• Status: Expired due to Fees

• Current Assignee: Precision Dynamics Corporation (Brady Corporation)
• Original Assignee: Precision Dynamics Corporation (Brady Corporation)
• Inventors: Beigel, Michael L., Leipper, John
• Primary Examiner(s): LE, VU ANH
• Application Number:
  US11/378,876
• Publication Number:
  US 20060171187A1
• Time in Patent Office: 642 Days
• Field of Search: 365/149, 365/105, 365/175, 365/103
• US Class Current: 365/149
• CPC Class Codes: G06K 19/0701 at least one of the integrated circuit chips comprising an arrangement for power management
• CPC Class Codes: G06K 19/0723 the record carrier comprising an arrangement for non-contact communication, e.g. wireless communication circuits on transponder cards, non-contact smart cards or RFIDs
• CPC Class Codes: G06K 19/07749 the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card
• CPC Class Codes: G11C 11/005 comprising combined but independently operative RAM-ROM, RAM-PROM, RAM-EPROM cells
• CPC Class Codes: G11C 14/00 Digital stores characterised by arrangements of cells having volatile and non-volatile storage properties for back-up when the power is down
• CPC Class Codes: G11C 17/06 using diode elements G11C17/14 takes precedence
• CPC Class Codes: H01L 27/1021 including diodes only
• CPC Class Codes: H10B 20/00 Read-only memory [ROM] devices
• CPC Class Codes: H10B 20/20 Programmable ROM [PROM] devices comprising field-effect components H10B20/10 takes precedence

Abstract

A composite rectifying charge storage device, consisting of a rectifier and capacitor which share common elements, is provided in a memory circuit or memory cell. In one form, the memory cell is adapted for alternative operation as a random access memory (RAM) or as a read only memory (ROM).

Claims

1. A memory circuit, comprising:

at least one memory cell including a word line and a bit line;

a rectifier component;

a common conductor connected to one side of said rectifier; and

a capacitor component incorporating said common conductor;

said rectifier and capacitor components being coupled between said word line and said bit line;

said rectifier component, common conductor and capacitor component comprising a unitary element.

2. The memory circuit of claim 1, wherein said at least one memory cell comprises a matrix of memory cells each coupled to a respective pair of word and bit lines.

3. The memory circuit of claim 1, wherein said rectifier component is coupled to one of said word line and said bit line, and wherein said capacitor component is coupled to the other of said word line and said bit line.

4. The memory circuit of claim 1, wherein said rectifier component comprises a diode component.

5. The memory circuit of claim 4, wherein said diode component is forward-bias oriented relative to said capacitor component.

6. The memory circuit of claim 4, wherein said diode component is reverse-bias oriented relative to said capacitor component.

7. The memory circuit of claim 4, wherein said at least one memory cell further includes a state line for programming said diode component in a selected one of substantially conductive and substantially nonconductive states.

8. The memory circuit of claim 1, wherein said capacitor component comprises said common conductor, a second conductor, and a dielectric material disposed therebetween.

9. The memory circuit of claim 8, wherein said common conductor is coupled to one of said word line and said bit line, and said second conductor is coupled to ground.

10. The memory circuit of claim 8, wherein said at least one memory cell further includes a state line coupled to one of said common conductor and said second conductor.

11. The memory circuit of claim 1, further including a gate element coupled between one of said rectifier and capacitor components and said word line.

12. The memory circuit of claim 1, further including a gate transistor having a gate junction coupled to said word line, and source and drain junctions coupled between said bit line and one of said rectifier and capacitor components.

13. The memory circuit of claim 12, wherein said capacitor component comprises said common conductor, a second conductor, and a dielectric material disposed therebetween, said source and drain junctions of said gate transistor being coupled between said bit line and said second conductor, said rectifier component being coupled to ground.

14. The memory circuit of claim 12, further including a RAM enable transistor coupled to said rectifier component for selectively setting said rectifier component in a selected one of substantially conductive and substantially nonconductive states.

15. The memory circuit of claim 14, wherein said rectifier component comprises an irreversible state diode component.

16. The memory circuit of claim 14, wherein said rectifier component comprises a reversible state diode component.

17. The memory circuit of claim 1, wherein said rectifier and capacitor components are carried on a common substrate.

18. The memory circuit of claim 17, wherein said common substrate is a flexible substrate.

19. The memory circuit of claim 17, wherein said capacitor structure incorporates said common substrate.

20. The memory circuit of claim 1, further including a gate transistor;

said rectifier component, common conductor, capacitor component and gate transistor comprising a unitary element.

21. The memory circuit of claim 1, further including a RAM enable transistor;

said rectifier component, common conductor, capacitor component, gate transistor and RAM enable transistor comprising a unitary element.

22. The memory circuit of claim 1, further including a RAM enable transistor;

said rectifier component, common conductor, capacitor component and RAM enable transistor comprising a unitary element.

23. A memory circuit, comprising:

at least one memory cell including a word line and a bit line;

a rectifier component;

a common conductor connected to one side of said rectifier;

a capacitor component incorporating said common conductor; and

a gate transistor coupled between one of said rectifier and capacitor components and said word line;

said rectifier component, common conductor, capacitor component and gate transistor comprising a unitary element.

24. The memory circuit of claim 23, further including a RAM enable transistor coupled to said rectifier component for selectively setting said rectifier component in a selected one of substantially conductive and substantially nonconductive states;

said rectifier component, common conductor, capacitor component, gate transistor and RAM enable transistor comprising a unitary element.

25. A memory circuit, comprising:

at least one memory cell including a word line and a bit line;

a rectifier component;

a common conductor connected to one side of said rectifier;

a capacitor component incorporating said common conductor;

said rectifier and capacitor components being coupled between said word line and said bit line; and

a RAM enable transistor coupled to said rectifier component for selectively setting said rectifier component in a selected one of substantially conductive and substantially nonconductive states;

said rectifier component, common conductor, capacitor component and said RAM enable transistor comprising a unitary element.