Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1991-12-11
1993-09-28
Pascal, Robert J.
Amplifiers
With semiconductor amplifying device
Including differential amplifier
307530, 365205, H03F 345
Patent
active
052489469
ABSTRACT:
An amplifier circuit of a symmetrical type is implemented with load transistors 1, 3, 5, 6 and input transistors 2, 4. Load transistors 1, 5 and input transistor 2 constitute a first inverter, and load transistors 3, 6 and input transistor 4 constitute a second inverter. A change in the output potential of each inverter is transmitted to a load transistor of the other inverter and increases the fluctuation of the potential of an output signal. A transistor 9 or 10 for current control is arranged between an input transistor and ground or between a load transistor and a power supply. The transistor 9 or 10 for current control interrupts through current when operation of the amplifier circuit is unnecessary and enhances the gain when the amplifier circuit is on operation. The gain is enhanced by setting the conductance of the load transistor and the conductance of the input transistor on predetermined conditions. Furthermore, an offset voltage caused in each amplifier circuit is canceled out by connecting two sets of symmetrical-type amplifier circuits.
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Anami Kenji
Murakami Shuji
Ohba Atsushi
Dinh Tan
Mitsubishi Denki & Kabushiki Kaisha
Pascal Robert J.
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