Electronic digital logic circuitry – Interface
Patent
1995-06-15
1996-11-19
Westin, Edward P.
Electronic digital logic circuitry
Interface
326 63, H03K 190175
Patent
active
055766382
ABSTRACT:
A level shift circuit is provided which maintains DC level of output signals constant by controlling the level variation of the output signals according to DC level variation of the input signal. An input signal is applied to a first circuit comprised of a first buffer, a first resistor and a first constant current source. DC component extracted from the input signal is applied to a second circuit comprised of a second buffer, a second resistor and a second constant current source. A reference voltage and a voltage obtained by subtracting a voltage drop of the second resistor from DC component are applied to an operational amplifier, respectively. An resultant output of the operational amplifier controls the first and the second constant current resources, and then corrects a variation of DC component of the input signal to obtain an output signal having a constant shift level.
REFERENCES:
patent: 4492882 (1985-01-01), Jensen et al.
patent: 4703199 (1987-10-01), Ely
patent: 4972517 (1990-11-01), Kondou et al.
patent: 5047657 (1991-09-01), Seevinck et al.
patent: 5097144 (1992-03-01), Chang et al.
Mitsubishi Denki & Kabushiki Kaisha
Roseen Richard
Westin Edward P.
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