Two input sense circuit

Details Two input sense circuit Two input sense circuit

1979-10-15

1982-03-23

Chatmon, Jr., Saxfield

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307362, 3072388, 307279, H03K 518, H03K 3353, H03K 3286, G11C 706

Patent

active

043214924

ABSTRACT:
The sense circuit includes two "skewed" inverters. The inverters are skewed in that their switching point is set closer to one (e.g. V.sub.HIGH) of the inverter operating potentials than to the other potential (e.g. V.sub.LOW). Therefore, the skewed inverters respond earlier to signals making a transition from a first level to a second level than to signals, of like slope, making a transition from the second to the first level. Each inverter is connected at its input to a different one of first and second bit lines and the output of each inverter is connected to the input of the other via a gating transistor whose conductivity is controlled by the output of the other inverter. Skewing the inverters enables sequential operation of the inverters of the circuit. The first inverter to sense a transition on one line going from the first to the second level, charges the other line and the input of the second inverter to the first level via a gating transistor which is turned off only after the other line reaches the first level. The ouput of the second inverter then goes to the second level and is coupled to the one line via a gating transistor whose turn on is controlled by the output of the first inverter. The sense circuit is well suited for use with a memory cell of the type having output terminals at which complementary signals are produced and which, for any binary condition, provides active drive to only one of the bit lines and a passive high impedance drive to the other bit line permitting it to float over a wide range of potential.

REFERENCES:
patent: 3962589 (1976-06-01), Priel et al.
patent: 4060740 (1977-11-01), Nishimura
patent: 4072868 (1978-02-01), De La Moneda et al.
patent: 4096401 (1978-06-01), Hollingsworth
patent: 4107556 (1978-08-01), Stewart et al.
patent: 4110639 (1978-08-01), Redwine
patent: 4114055 (1978-09-01), Hollingsworth
patent: 4170741 (1979-10-01), Williams
patent: 4179626 (1979-12-01), Oehler
patent: 4196363 (1980-04-01), Malaviya
patent: 4216390 (1980-08-01), Stewart

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