Abstract:
Described is an apparatus which comprises: a first access transistor controllable by a write word-line (WWL); a second access transistor controllable by a read word-line (RWL); and a ferroelectric cell coupled to the first and second access transistors, wherein the ferroelectric cell is programmable via the WWL and readable via the RWL. Described is a method which comprises: driving a WWL, coupled to a gate terminal of a first access transistor, to cause the first access transistor to turn on; and driving a WBL coupled to a source/drain terminal of the first access transistor, the driven WBL to charge or discharge a storage node coupled to the first access transistor when the first access transistor is turned on, wherein the ferroelectric cell is coupled to the storage node and programmable according to the charged or discharged storage node.
Abstract:
A memory cell and memories constructed from that memory cell are disclosed. A memory according to the present invention includes a ferroelectric capacitor, a charge source and a read circuit. The charge source receives a data value to be stored in the ferroelectric capacitor. The charge source converts the data value to a remanent charge to be stored in the ferroelectric capacitor and causes that remanent charge to be stored in the ferroelectric capacitor. The read circuit determines a charge stored in the ferroelectric capacitor. The data value has more than three distinct possible states, and the determined charge has more than three determined values. The memory also includes a reset circuit that causes the ferroelectric capacitor to enter a predetermined known reference state of polarization.
Abstract:
Ferroelectric components, such as the ferroelectric field effect transistors (FeFETs), ferroelectric capacitors and ferroelectric diodes described above may be operated as multi-level memory cells as described by the present invention. Storing multiple bits of information in each multi-level memory cell may be performed by a controller coupled to an array of the ferroelectric components configured as ferroelectric memory cells. The controller may execute the steps of receiving a bit pattern for writing to a multi-level memory cell comprising a ferroelectric layer; selecting a pulse duration for applying a write pulse to the memory cell based, at least in part, on the received bit pattern; and applying at least one write pulse to the memory cell having the selected pulse duration, in which the at least one write pulse creates a remnant polarization within the ferroelectric layer that is representative of the received bit pattern.
Abstract:
A counter that can include a plurality of count stages is disclosed. Each count stage includes a ferroelectric capacitor characterized by first and second polarization states, a variable impedance element, reset and count ports and a detector. The variable impedance element has an impedance between first and second switch terminals that is determined by a signal on a control terminal, the ferroelectric capacitor being connected between the control terminal and the first switch terminal. A reset signal coupled to the control terminal causes the ferroelectric capacitor to be polarized in the first polarization state. The count port is configured to receive pulses to be counted, the count port being connected to the first switch terminal by a conductive load. The detector generates a count complete signal if a potential on the first terminal exceeds a threshold value while the count port is receiving one of the pulses.
Abstract:
An apparatus comprises field effect transistor (FET) structures stacked horizontally and vertically in a three dimensional memory array architecture, gates extending vertically and spaced horizontally between the plurality of FET structures, and a ferroelectric material separating the FET structures and the gates. Individual ferroelectric FETs (FeFETs) are formed at intersections of the FET structures, the gates, and the ferroelectric material. Another apparatus comprises a plurality of bit lines and word lines. Each bit line has at least two sides that are coupled with a ferroelectric material such that each bit line is shared by neighboring gates to form a plurality of FeFETs. A method of operating a memory array comprises applying a combination of voltages to a plurality of word lines and digit lines for a desired operation for a plurality of FeFET memory cells, at least one digit line having plurality of FeFET memory cells accessible by neighboring gates.
Abstract:
A doped electroconductive organic polymer is used for forming the electrode of a ferroelectric device or an interconnect. An exemplary ferroelectric device is a ferrelectric capacitor comprising: a substrate (101); a first electrode (106) disposed on the substrate; a ferroelectric layer (112) disposed on and in contact with the first electrode; and a second electrode (116) disposed on and in contact with the ferroelectric layer, wherein at least one of the first electrode and the second electrode is an organic electrode comprising a doped electroconductive organic polymer, for example DMSO-doped PEDOT-PSS.
Abstract:
Provided are a poly a-amino acid having good film-producing capability, and a ferromagnetic memory element having excellent moldability and workability and further, excellent operating stability when exposed to high temperatures. The ferromagnetic memory element comprises a poly a-amino acid that is a copolymer formed from glutamic acid-?-ester units represented by formula (I) (I) (where R1 is an optionally substituted C1-8 alkyl group or benzyl group optionally substituted by a halogen atom, alkoxy group or nitro group) and glutamic acid-?-ester units represented by formula (II) (II) (where R2 is not the same as R1 and is an unsubstituted C3-16 alkyl group or C1-6 alkyl group wherein a portion or all of the hydrogen atoms are optionally substituted by halogen atoms, C3-12 acyclic hydrocarbon groups, C1-6 alkoxy groups, cyano groups, phenyl groups (where a portion or all of the hydrogen atoms are optionally substituted by halogen atoms or alkoxy groups), phenyl alkoxy groups (where a portion or all of the hydrogen atoms are optionally substituted by halogen atoms or alkoxy groups), or phenyl alkyl carbamate groups (where a portion or all of the hydrogen atoms are optionally substituted by halogen atoms or alkoxy groups)) and has a ratio of units represented by formula (I) and units represented by formula (II) ((I)/(II)) that is between 10/90 and 90/10 by molar ratio.
Abstract:
Provided are a memory device using graphene and a method for manufacturing same. The memory device using graphene comprises: at least one programming electrode arranged so as to intersect with a graphene layer; and a ferroelectric layer interposed between the graphene layer and the programming electrode. Thus, the memory device may have non-volatile properties using a difference in resistances of the graphene layer due to the polarity of a polling voltage applied through the at least one programming electrode. Further, two or more programming electrodes are arranged, and polling voltages of the same polarity or different polarities are applied to each programming electrode, thereby achieving multi-bits. In addition, the method for manufacturing the memory device using graphene involves forming only one ferroelectric layer capable of maintaining polarization through polling, thus enabling an electric field to be continuously applied to the graphene layer contacting the ferroelectric layer.
Abstract:
An apparatus that includes a reference generating circuit configured to generate a reference signal for a non-volatile memory (NVM) device, the reference generating circuit including a first circuit comprising at least one metal-oxide-semiconductor capacitor, the first circuit generating a first signal component of the reference signal, and a second circuit comprising at least one ferroelectric capacitor, the second circuit generating a second signal component of the reference signal, in which the second signal component is temperature dependent.
Abstract:
Described is an apparatus which comprises: a first transistor; a second transistor having a first terminal coupled to a first terminal of the first transistor; a first conductor coupled to a second terminal of the second transistor; a magnetoelectric (ME) layer coupled to the first conductor; and a ferromagnetic (FM) layer coupled to the ME layer and to a second terminal of the first transistor.