Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1989-01-06
1990-07-03
Miller, Stanley D.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307279, 307443, 307359, 307571, 307544, H03K 19003, H03K 1901, H03K 19094, H03K 3356
Patent
active
049393901
ABSTRACT:
An integrated circuit, having applicability to GaAs circuitry, is disclosed for performing a current steering logic function. The integrated circuit comprises a switching circuit, a high impedance tail current source, and a pair of low impedances respectfully coupled to the tail current source through a respective one of the switching transistors. The resistors in the tail current source and in the load resistance are formed from sheet resistor material so that any process-induced variation in the resistivity of the sheet material causes a mutual but compensatory variation in both the load and current source resistors, maintaining a match between the current capability of the current source and the resistance of the loads. The follower circuit, on the other hand, comprises a low impedance FET and a follower current source having an active load whose current is primarily dependent on its threshold voltage. Accordingly, process factors which affect the threshold voltage of the low impedance FET also affect the threshold voltage of the active load in a mutually compensatory manner without adversely affecting the output levels of the logic level signals from the current steering circuit.
REFERENCES:
patent: 4661725 (1987-04-01), Chantepie
patent: 4800303 (1989-01-01), Graham et al.
patent: 4808851 (1989-02-01), Chantepie
patent: 4831284 (1989-05-01), Anderson et al.
Bertelson David R.
Collins David W.
Miller Stanley D.
Vitesse Semiconductor Corporation
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