Electronic digital logic circuitry – Clocking or synchronizing of logic stages or gates – Field-effect transistor
Patent
1996-09-30
1999-12-14
Santamauro, Jon
Electronic digital logic circuitry
Clocking or synchronizing of logic stages or gates
Field-effect transistor
326 17, 326 28, 326115, 327 55, 327 57, H03K 19096, H03K 19017
Patent
active
060022701
ABSTRACT:
A synchronous differential logic system is provided for implementation of pipelined computational structures capable of hyperfrequency operation. An individual logic circuit has a differential cascode switch and a synchronous sense amplifier which operates as a latch. A plurality of differential inputs are connected to the differential cascode switch which produces complementary signals at first and second nodes. The cascode switch is connected to the synchronous sense latch which provides complementary output signals of the logic circuit. The synchronous sense latch comprises an equalization transistor and two cross-coupled inverters, each connected to first and second power supply buses. The equalization transistor is connected to the first and second outputs, of the logic gate and to a global system clock. The two output signals of the logic circuit are forced by the equalization transistor to a voltage approximately equal to one half of the power supply voltage in one clock phase and are partially released by the equalization transistor in the second clock phase. The synchronous sense latch output is a function of the differential logic inputs applied to the cascode switch. High speed of operation is also accomplished by a) reducing logic signal voltage swings, b) using a synchronous sense latch which is not disconnected from the power supply during equalization, and c) forcing the terminals of each bistable circuit to a substantially sensitive operating point which is one half of the power supply voltage, before the bistable circuit switches to valid logic levels.
REFERENCES:
patent: 4247791 (1981-01-01), Rovell
patent: 4694427 (1987-09-01), Miyamoto et al.
patent: 5144162 (1992-09-01), Tran
patent: 5216295 (1993-06-01), Hoang
patent: 5272395 (1993-12-01), Vincelette
patent: 5583456 (1996-12-01), Kimura
Santamauro Jon
Spaceborne, Inc.
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