Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1990-10-11
1992-01-07
Miller, Stanley D.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307454, 307263, 307546, 330257, 330288, H03K 19096, H03K 1716
Patent
active
050794485
ABSTRACT:
An emitter-follower circuit suitable for use in an emitter-coupled logic circuit includes an emitter-follower NPN transistor having a first emitter and a second emitter, a biasing circuit having a diode and a first resistor, a load capacitance discharging state detection circuit having a PNP transistor and a second resistor, and a second NPN transistor adapted to be connected with a load. The second resistor detects a current passing through the PNP transistor and the second NPN transistor is activated by the voltage value detected by the second resistor to form a path discharging charge due to a load capacitance. Even when the current amplification h.sub.FE of the discharging PNP transistor is low, the second NPN transistor which has a high h.sub.FE forms the main discharge current path, so that electric charge on the load capacitance can discharge rapidly. As a result, a high-speed switching emitter-follower circuit is provided.
REFERENCES:
patent: 4467223 (1984-08-01), Neely
patent: 4485313 (1984-11-01), Nagano
patent: 4857864 (1989-08-01), Tanaka et al.
Miller Stanley D.
NEC Corporation
Wambach Margaret Rose
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