Static random access memory (SRAM) tracking cells and methods of forming same
First Claim
1. A static random access memory (SRAM) array comprising:
- a writable SRAM cell disposed in a first row of the SRAM array; and
an SRAM read current tracking cell in the first row of the SRAM array, wherein the SRAM current tracking cell comprises;
a first read pull-down transistor comprising;
a first gate electrically connected to a first positive supply voltage line without any intervening active devices, and wherein a voltage applied to the first gate is directly tied to a voltage of the first positive supply voltage line;
a first source/drain electrically connected to a first ground line; and
a second source/drain; and
a first read pass-gate transistor comprising;
a third source/drain electrically connected to the second source/drain; and
a fourth source/drain electrically connected to a read tracking bit line (BL), wherein the read tracking BL is electrically connected to a read sense amplifier (SA) timing control circuit.
1 Assignment
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Accused Products
Abstract
An embodiment static random access memory (SRAM) array includes a writable SRAM cell disposed in a first row of the SRAM array and an SRAM read current tracking cell in the first row of the SRAM array. The SRAM current tracking cell includes a first read pull-down transistor and a first read pass-gate transistor. The first read pull-down transistor includes a first gate electrically connected to a first positive supply voltage line; a first source/drain electrically connected to a first ground line; and a second source/drain. The first read pass-gate transistor includes a third source/drain electrically connected to the second source/drain and a fourth source/drain electrically connected to a read tracking bit line (BL). The read tracking BL is electrically connected to a read sense amplifier timing control circuit.
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Citations
20 Claims
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1. A static random access memory (SRAM) array comprising:
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a writable SRAM cell disposed in a first row of the SRAM array; and an SRAM read current tracking cell in the first row of the SRAM array, wherein the SRAM current tracking cell comprises; a first read pull-down transistor comprising; a first gate electrically connected to a first positive supply voltage line without any intervening active devices, and wherein a voltage applied to the first gate is directly tied to a voltage of the first positive supply voltage line; a first source/drain electrically connected to a first ground line; and a second source/drain; and a first read pass-gate transistor comprising; a third source/drain electrically connected to the second source/drain; and a fourth source/drain electrically connected to a read tracking bit line (BL), wherein the read tracking BL is electrically connected to a read sense amplifier (SA) timing control circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A static random access memory (SRAM) tracking cell comprising:
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a first gate electrode disposed over a first active region of a first invertor; a second gate electrode; and a second active region under the first gate electrode and the second gate electrode, wherein the second active region provides; a first source/drain region electrically connected to a ground line; and a second source/drain region on an opposite side of the first gate electrode as the first source/drain region, wherein the second source/drain region is further disposed between the first gate electrode and the second gate electrode; and a third source/drain region electrically connected to a tracking bit line (BL), wherein the tracking BL is electrically connected to a read sense amplifier (SA) timing control circuit. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A method comprising:
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disposing a static random access memory (SRAM) read current tracking cell in a same row of an SRAM array as a writable SRAM cell, wherein the SRAM read current tracking cell comprises; a first invertor comprising a first gate; a first read pull-down transistor comprising a second gate, a first source/drain, and a second source/drain; and a first read pass-gate transistor comprising a third gate, a third source/drain electrically connected to the second source/drain, and a fourth source/drain; electrically connecting the second gate to a positive power voltage supply line through a gate contact of the first gate, wherein a voltage applied to the second gate is directly tied to a voltage of the positive power voltage supply line; electrically connecting the first source/drain to a ground line; electrically connecting the third gate to a read current tracking control circuit; electrically connecting the fourth source/drain to a tracking bit line (BL); and electrically connecting the tracking BL to a read sense amplifier (SA) timing control circuit. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification