Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1984-07-09
1987-06-23
Heyman, John S.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307355, 307255, 307494, 330252, 330261, 365208, 360 68, H03K 1716, H03K 19003
Patent
active
046755594
ABSTRACT:
This invention provides a differential circuit having first and second transistors interconnected by a third transistor which is symmetrically constructed. A current source is selectively connected to the base of the third transistor. When the current source is connected to the base of the third transistor, the third transistor is saturated, forming a very low impedance path between the first and second transistors. However, when the current source is disconnected from the base of the third transistor, the third transistor impedes the voltage breakdown path between the bases of the first and second transistors. The differential circuit is particularly useful in an improved compact magnetic media system wherein both the stored signal and the write signal or voltage are applied to the bases of the first and second transistor of the circuit without the high write voltages destroying the high performance first and second transistors.
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Millman et al, Electronic Devices and Circuits; p. 247-251; McGraw-Hill Co. 1967.
Poppelbaum, Electronics (pub.); p. 108; 4/4/1967.
K. G. Tertel, IBM Technical Disclosure Bulletin, vol. 13, No. 2, Jul. 1970, pp. 484-485, "Differential Amplifier".
B. C. Atwood, IBM Technical Disclosure Bulletin, vol. 17, No. 9, Feb. 1975, "Symmetrical Low-Offset Transistor", p. 2574.
Cottrell Peter E.
Gersbach John E.
Pricer Wilbur D.
Heyman John S.
International Business Machines - Corporation
Limanek Stephen J.
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