Abstract Sense line and sense amplifier configurations and circuits for coupling to magnetic memory elements. A sense line comprising a twisted pair of conductors provides coupling along its length to the memory elements. A pair of sense lines may be connected in series or parallel to provide sense signal output pulses of increased amplitude or provide redundancy in the sensing scheme. Further permutations and combinations of the twisted pair sense line provide sense signal output pulses of different amplitude to also provide, e.g., half select pulses. A sense amplifier system utilizes multiplexing techniques to simplify the sense scheme and reduce the amount of circuitry required between the sense lines and the buffer system.
A system for processing sense winding output pulses from a plurality of sets of closed loop sense lines comprising in combination: multiplexing means coupled to said plurality of sets of closed loop sense lines; sense amplifier means coupled to the output of said multiplexing means for amplifying sense output pulses from any one of said closed loop sense lines; buffer storage means for transmitting said amplified sense output pulses to utiliZation means; said sense amplifier means comprising; a first differential amplifier stage; a transformer having a primary and a secondary winding; an operational amplifier stage; said secondary winding having a center tap coupled to reference potential; said secondary winding being coupled to an input of said operational amplifier; and means for coupling strobe pulse generating means to the other input of said operational amplifier.
Claim 2
Independent Claim
134 words
A system for processing sense winding output pulses from a plurality of sets of closed loop sense lines comprising in combination: multiplexing means coupled to said plurality of sets of closed loop sense lines; sense amplifier means coupled to the output of said multiplexing means for amplifying sense output pulses from any one of said closed loop sense lines; buffer storage means for transmitting said amplified sense output pulses to utiliZation means; said sense amplifier means comprising; a first differential amplifier stage; a transformer having a primary and a secondary winding; an operational amplifier stage; said secondary winding having a center tap coupled to reference potential; said secondary winding being coupled to an input of said operational amplifier; and means for coupling strobe pulse generating means to the other input of said operational amplifier.