Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1990-02-14
1992-01-21
Miller, Stanley D.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307446, 307451, 307475, H03K 19094, H03K 19017, H03K 1920, H03K 19003
Patent
active
050830481
ABSTRACT:
A tri-state output buffer has a signal input terminal, a control terminal and a signal ouput terminal and is controlled by a control signal applied to the control terminal so as to be selectively put in an inactive condition maintaining the signal output terminal in a high impedance condition and in an active condition bringing the signal output terminal either into a high level or into a low level in response to a signal applied to the signal input terminal. The tri-state output buffer comprises a pre-buffer circuit having an input node connected to the signal input terminal, and an output node, and controlled by the control signal applied to the control terminal so as to selectively bring the output node into a high impedance condition or into an active condition assuming either a high level or a low level in response to the signal applied to the signal input terminal. A bipolar transistor is connected between a power supply voltage and a ground and has a base connected to the output node of the pre-buffer circuit and an emitter connected to the signal output terminal of the tri-state output buffer. A first switching element is connected between the ground and the signal output terminal of the tri-state output buffer and is controlled by the control signal applied to the control terminal so as to be selectively turned on and off. A second switching element is connected between the base of the bipolar transistor and the signal output terminal of the tri-state output buffer and is controlled by the control signal applied to the control terminal so as to be selectively turned on and off.
REFERENCES:
patent: 4280065 (1981-07-01), Minato et al.
patent: 4703203 (1987-10-01), Gallup et al.
patent: 4733110 (1988-03-01), Hara et al.
patent: 4804869 (1989-02-01), Masuda et al.
patent: 4963766 (1990-10-01), Lungberg
Bertelson David R.
Miller Stanley D.
NEC Corporation
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