Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – Nonlinear amplifying circuit
Patent
1996-07-01
1998-10-06
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
Nonlinear amplifying circuit
327111, 330253, 330255, 330257, 323315, H03F 345, H03F 326
Patent
active
058182950
ABSTRACT:
An operational amplifier with improved operational speed, as well as low power consumption, arranges a current mirror made of the pMOS transistors PT.sub.17 and PT.sub.18 in the stage after the initial-stage differential amplifier, supplies the output of the initial-stage differential amplifier to the gate of the nMOS transistor NT.sub.14, supplies the current flowing through the current mirror to the output stage side by a current mirror made of the pMOS transistors PT.sub.15 and PT.sub.16, and lastly a pMOS transistor PT.sub.19 is connected as a constant-current source between the supply line for the power supply voltage V.sub.DD and the node ND.sub.12, and makes the idling current I.sub.19 flow in the node ND.sub.12. Due to this, stabilization of DC operations during normal states and when shifting its states can be designed without considering the characteristics in the vicinity of the threshold voltage of pMOS transistor PT.sub.16, and thus stringent controls in the manufacturing process and the like are unnecessary.
REFERENCES:
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patent: 5034700 (1991-07-01), Herrmann et al.
patent: 5113129 (1992-05-01), Hughes
patent: 5115187 (1992-05-01), Hayashi
patent: 5144259 (1992-09-01), Yoshida
patent: 5504458 (1996-04-01), Van Brunt et al.
patent: 5670910 (1997-09-01), Kato
Chimura Tsuyoshi
Higashi Masahiko
Satoh Tatsumi
Callahan Timothy P.
Donaldson Richard L.
Englund Terry L.
Kempler William B.
Texas Instruments Incorporated
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