Level shifter circuit and associated memory device
First Claim
1. A level shifter circuit comprising:
- a first input inverter stage having an input configured to receive an input signal that switches within a first voltage range, wherein the first input inverter stage is designed to operate in the first voltage range;
a first capacitive element coupled between an output of the first input inverter stage and a first holding node;
a latch stage coupled between the first holding node and a second holding node, the second holding node serving as an output terminal configured to supply an output signal that switches within a second voltage range that is higher than the first voltage range, wherein the latch stage is designed to operate in the second voltage range; and
an initialization stage coupled to the second holding node and configured to define an initial operating state of the latch stage, wherein the initialization stage comprises an initialization transistor having a current path coupled between the second holding node and a reference terminal set at an initialization voltage, and having a gate configured to receive a reset signal.
1 Assignment
0 Petitions
Accused Products
Abstract
A level shifter circuit is designed to shift an input signal that switches within a first voltage range to supply an output signal that switches within a second voltage range, higher than the first voltage range. A first inverter stage has an input receiving the input signal and also has an output. A first capacitive element is connected between the output of the first input inverter stage and a first holding node. A latch stage is connected between the first holding node and a second holding node that is coupled to an output terminal, on which the output signal is present. The first input inverter stage is designed to operate in the first voltage range, and the latch stage is designed to operate in the second voltage range.
23 Citations
23 Claims
-
1. A level shifter circuit comprising:
-
a first input inverter stage having an input configured to receive an input signal that switches within a first voltage range, wherein the first input inverter stage is designed to operate in the first voltage range; a first capacitive element coupled between an output of the first input inverter stage and a first holding node; a latch stage coupled between the first holding node and a second holding node, the second holding node serving as an output terminal configured to supply an output signal that switches within a second voltage range that is higher than the first voltage range, wherein the latch stage is designed to operate in the second voltage range; and an initialization stage coupled to the second holding node and configured to define an initial operating state of the latch stage, wherein the initialization stage comprises an initialization transistor having a current path coupled between the second holding node and a reference terminal set at an initialization voltage, and having a gate configured to receive a reset signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
-
10. A level shifter circuit comprising:
-
a first input inverter stage having an input configured to receive an input signal that switches within a first voltage range and an output coupled to a first holding node, wherein the first input inverter stage is configured to operate in the first voltage range; a latch stage coupled between the first holding node and a second holding node, the second holding node serving as an output terminal configured to supply an output signal that switches within a second voltage range that is higher than the first voltage range, wherein the latch stage is configured to operate in the second voltage range; a second input inverter stage having an input configured to receive a complementary input signal that switches with the first voltage range, the complementary input signal being a complement of the input signal, the second input inverter stage also having an output coupled to the second holding node, wherein the second input inverter stage is configured to operate in the first voltage range; and an initialization stage coupled to the second holding node and configured to define an initial operating state of the latch stage, wherein the initialization stage comprises an initialization transistor having a current path coupled between the second holding node and a reference terminal set at an initialization voltage, and having a gate configured to receive a reset signal. - View Dependent Claims (11)
-
-
12. A memory device, comprising:
-
a memory array including a plurality of memory cells arranged in rows and columns, the memory cells being coupled to respective wordlines and bitlines; a decoder stage, configured to select and bias the wordlines or the bitlines as a function of address signals, wherein address signals comprise signals that switch within a first voltage range and the wordlines or bitlines are biased at a voltage within a second voltage range that is greater than first voltage range, wherein the decoder stage comprises a plurality of shifter circuits, each level shifter circuit comprising; a first input inverter stage having an input configured to receive an address signal, wherein the first input inverter stage is configured to operate in the first voltage range; a first capacitive element coupled between an output of the first input inverter stage and a first holding node; a latch stage coupled between the first holding node and a second holding node, the second holding node serving as a terminal configured to supply a bias signal for use with a respective wordline or bitline, wherein the latch stage is configured to operate in the second voltage range; and an initialization stage coupled to the second holding node and configured to define an initial operating state of the latch stage, wherein the initialization stage comprises an initialization transistor having a current path coupled between the second holding node and a reference terminal set at an initialization voltage, and having a gate configured to receive a reset signal. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
-
-
20. A method of operating a level shifter circuit, the method comprising:
-
receiving an input signal that switches within a first voltage range with a first input inverter having an output coupled to a first holding node; latching a value of the input signal into a latch circuit coupled between the first holding node and a second holding node by using a first capacitive element coupled between the first input inverter and the first holding node, wherein the latch circuit comprises a first supply terminal and a second supply terminal; supplying an output signal with the second holding node, wherein the second holding node switches within a second voltage range different than the first voltage range; and initializing a state of the latch circuit by providing a reset signal to a control terminal of an initialization transistor having a current path coupled between the first supply terminal and the second holding node. - View Dependent Claims (21, 22, 23)
-
Specification