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US 4,051,443 AGranted
Differential amplifier
AssigneeHitachi, Ltd.
InventorsKunio Seki, Yukio Suzuki, Yoshio Sakamoto
Life of this patent
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AssigneeHitachi, Ltd.
InventorsKunio Seki, Yukio Suzuki, Yoshio Sakamoto
Estimating the term…
A differential circuit including in a monolithic semiconductor chip a pair of differential amplifying elements having each one electrode connected in common and to a common diode means and respective input and output electrodes, another diode means connected to the output electrode of one of said amplifying elements, one transistor having an input signal electrode connected to one end of said common diode means to allow the passage of a current of half the magnitude of that through said common diode, another transistor having an input signal electrode connected to one end of said another diode means to allow the passage of a current of equal magnitude as that through said another diode means, and an output terminal connected to said one and another transistors.
A differential amplifier comprising a pair of differential amplifying elements each having an input electrode, a ground electrode and an output electrode, a first power supply terminal, a second power supply terminal, a common impedance means, a first current source means including a first diode means and a first transistor of a first conductivity type, a second current source means including a second diode means and a second transistor means of a second conductivity type, and an output terminal, the ground electrodes of said two differential amplifying elements being connected in common to one end of said common impedance means, said second diode means being connected between the other end of said common impedance means and said second power supply terminal, said second transistor having a base and an emitter connected to the other end of said common impedance means and the second power supply terminal, respectively, said first diode means being connected between said first power supply terminal and the output electrode of one of said two differential amplifying elements, said first transistor having a base and an emitter connected to the output electrode of said one of the two differential amplifying elements and said first power supply terminal, respectively, said output terminal being connected to the collectors of said first and second transistors and deriving a differential output signal current of the two signals applied to the respective input electrodes of said two differential amplifying elements, the operationally effective pn-junction area of said first diode means being selected substantially equal to that of said first transistor, and the operationally effective pn-junction area of said second diode means being selected substantially equal to twice of that of said second transistor.
A differential circuit formed in a monolithic semiconductor substrate, comprising:
A differential amplifier integrated circuit formed in a monolithic semiconductor substrate, comprising a pair of differential amplifying elements each having an input electrode, a ground electrode and an output electrode, a first power supply terminal, a second power supply terminal, a common impedance means, a first current source means including a first diode means and a first transistor of a first conductivity type, a second current source means including a second diode means and a second transistor means of a second conductivity type, and an output terminal, the ground electrodes of said two differential amplifying elements being connected in common to one end of said common impedance means, said second diode means being connected between the other end of said common impedance means and said second power supply terminal, said second transistor having a base and an emitter connected to the other end of said common impedance means and the second power supply terminal, respectively, said first diode means being connected between said first power supply terminal and the output electrode of one of said two differential amplifying elements, said first transistor having a base and an emitter connected to the output electrode of said one of the two differential amplifying elements and said first power supply terminal, respectively, said output terminal being connected to the collectors of said first and second transistors and deriving a differential output signal current of the two signals applied to the respective input electrodes of said two differential amplifying elements, the operationally effective pn-junction area of said first diode means being selected substantially equal to that of said first transistor, and the operationally effective pn-junction area of said second diode means being selected substantially equal to twice of that of said second transistor.
Dependencies are inferred from the claim text.