Method and apparatus for decoding memory
View Patent ↗A thin-film memory may include a thin-film transistor-free address decoder in conjunction with thin-film memory elements to yield an all-thin-film memory. Such a thin-film memory excludes all single-crystal electronic devices and may be formed, for example, on a low-cost substrate, such as fiberglass, glass or ceramic. The memory may be configured for operation with an external memory controller.
1. A method of operating an ovonic threshold switch (OTS) device comprising:
providing a first ovonic threshold switch (OTS) device;
coupling said OTS device to a first diode;
coupling said first OTS device and said first diode to a first conductive line; and
applying a reverse bias to said first diode, said reverse bias causing a first current to pass through said first diode, said first current causing said first OTS device to switch from a first conductivity state to a second conductivity state.
2. The method of claim 1 , further comprising coupling said first OTS device between a first power supply and said first conductive line.
3. The method of claim 2 , wherein said second conductivity state of said first OTS device permits a second current to pass between said first power supply and said first conductive line.
4. The method of claim 3 , further comprising coupling a memory element to said first conductive line.
5. The method of claim 4 , wherein said second current passes to said memory element.
6. The method of claim 5 , further comprising coupling said memory element to a second conductive line.
7. The method of claim 6 , wherein said second current passes from said first conductive line to said second conductive line through said memory element.
8. The method of claim 6 , further comprising coupling a second diode to said second conductive line.
9. The method of claim 8 , further comprising applying a reverse bias to said second diode.
10. The method of claim 9 , further comprising coupling a second OTS device to said second conductive line.
11. The method of claim 10 , wherein said reverse bias of said second diode causes a third current to pass through said second diode.
12. The method of claim 11 , wherein said third current causes said second OTS device to switch from a first conductive state to a second conductive state.
13. The method of claim 12 , further comprising coupling said second OTS device between a second power supply and said second conductive line.
14. The method of claim 13 , wherein said second conductivity state of said second OTS device permits a fourth current to pass between said second power supply and said second conductive line.
15. The method of claim 14 , further comprising coupling an isolation device between said first conductive line and said second conductive line, said isolation device being in series with said memory element, said isolation device having a resistive state and a conductive state.
16. The method of claim 15 , wherein said second current and said fourth current establish a voltage difference between said first conductive line and said second conductive line, said voltage difference establishing a first voltage drop across said isolation device.
17. The method of claim 16 , wherein said first voltage drop is sufficient to transform said isolation device from said resistive state to said conductive state.
18. The method of claim 1 , wherein said diode is a thin-film diode.