FETs logic circuit

Details FETs logic circuit FETs logic circuit

1997-03-21

1999-06-01

Santamauro, Jon

Electronic digital logic circuitry

Function of and, or, nand, nor, or not

Field-effect transistor

326 80, 326112, 326117, 327538, H03K 19094, H03K 190952

Patent

active

059091282

ABSTRACT:
A semiconductor integrated circuit having a field effect transistor formed on a compound semiconductor is disclosed, that comprises a first power supply, a second power supply for supplying a voltage lower than a voltage that the first power supplies, and at least one virtual power supply that is not connected to the outside and that has a voltage between the voltage of the first power supply and the voltage of the second power supply, wherein the number of the virtual power supplies is designated to a value larger than the quotient of which the voltage between the first power supply and the second power supply is divided by the forward turn-on voltage of a gate electrode of the field effect transistor. In the case that a signal received from a circuit with a low voltage is connected to a circuit between any power supply, the signal is received by a directly coupled logic circuit with a depletion type field effect transistor as a drive circuit. The threshold voltage of the depletion type field effect transistor is -.DELTA.V or higher where .DELTA.V is the voltage between each power supply.

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