Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1991-10-16
1993-06-08
Westin, Edward P.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307451, 307540, 307579, H03K 1716, H03K 1920
Patent
active
052182428
ABSTRACT:
In order to obtain an output circuit having pulldown resistance which feeds no through current to a CMOS inverter even if output impedance of a front stage circuit is in an extremely high state, an input end and an output end of an inverter (G1) are connected to an input terminal (P.sub.i) and a first input end of an OR gate (G5) respectively. A pulse generation circuit (SG) and a gate of a pulldown transistor (Q.sub.1) are connected to a second input end and an output end of the OR gate (G5) respectively. The pulldown transistor (Q.sub.1) has a drain and a source which are connected to the input terminal (P.sub.i) and a power source (V.sub.SS) respectively. An input end of a CMOS inverter (11) is connected to the input terminal (P.sub.i). Even if the front stage output impedance is extremely increased after the potential of the input terminal (P.sub.i) has been at a high logical level, the pulldown transistor (Q.sub.1) is quickly driven by pulses generated by the pulse generation circuit (SG), to lower the potential of the input end of the inverter (11).
REFERENCES:
patent: 4553045 (1985-11-01), Murotani
patent: 4612466 (1986-09-01), Stewart
patent: 4785203 (1988-11-01), Nakamura
patent: 4961010 (1990-10-01), Davis
patent: 5036222 (1991-07-01), Davis
patent: 5057711 (1991-10-01), Lee et al.
Imazu Taiji
Matsumoto Satoshi
Nishitani Kazuharu
Takiguchi Masao
Mitsubishi Denki & Kabushiki Kaisha
Sanders Andrew
Westin Edward P.
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