Browse Prior Art Database

BI-FET Non-Clocked Static Ram Sense Amplifier

IP.com Disclosure Number: IPCOM000041188D
Original Publication Date: 1987-Nov-01
Included in the Prior Art Database: 2005-Feb-02
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Aipperspach, AG: AUTHOR [+3]

Abstract

A BI-FET Non-Clocked Static Ram Sense Amplifier senses data in an array environment. The design is divided into two parts, the sense line drivers, and the amplifier. The function of the sense line drivers is to provide the DOT where all the bitlines can come together. The function of the amplifier is to convert the ECL level signal to CMOS levels which can be used in the Off Chip Driver.

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BI-FET Non-Clocked Static Ram Sense Amplifier

A BI-FET Non-Clocked Static Ram Sense Amplifier senses data in an array environment. The design is divided into two parts, the sense line drivers, and the amplifier. The function of the sense line drivers is to provide the DOT where all the bitlines can come together. The function of the amplifier is to convert the ECL level signal to CMOS levels which can be used in the Off Chip Driver.

Devices 1-5 represent the sense line driver. When a bit line is selected, (BLS) goes high. Node A goes to the state of the bit line. Devices 3 and 4 invert the data and drive device 5. If data is a 1, node A is high, node B is low, and device 5 is off. All non-selected sense line drivers force device 5 off, so in this case (SL) will be discharged low through R1 and devices 7 and 8. If data is a 0, node A is low, node B is high, and (SL) will be driven high by device 5.

R1, R2, R3 and devices 6-10 represent the amplifier. As mentioned above, R1 and devices 7 and 8 provide the down level for the sense line. Device 6 provides D.C. current for devices 7 and 8 to keep the down level at two Vbe's. R2, R3, with devices 9 and 10, convert the sense line levels to CMOS levels. When device 5 is on, the sense line is at VDD - Vbe. Since a Vtp is required to turn on device 9, R2 keeps device 10 off and the output remains low. When the drive to device 5 is switched off, the sense line is discharged through devices 7 and 8 and R1. The sense line nee...