Level shift circuit with gain enhancement

Details Level shift circuit with gain enhancement Level shift circuit with gain enhancement

1991-03-22

1992-09-15

Mottola, Steven

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330288, H03F 345

Patent

active

051481189

ABSTRACT:
A new level shifting circuit is presented which does not restrict the upper limit of the common-mode input range of an operational amplifier. This is important particularly in operational amplifiers designated to operate with low power supply voltages. Significant parameters. of the operational amplifier, such as the gain and the slew rate, can be controlled without adversely affecting the common-mode input voltage range. The level shifting stage operates nondifferentially to avoid stability problems found in differential stages. A further improvement is accomplished using current balancing to achieve gain enhancement.

REFERENCES:
patent: 3562660 (1971-02-01), Pease
patent: 4743862 (1988-05-01), Scheinberg
patent: 4767946 (1988-08-01), Taylor
Data Sheet, "IM741/IM741A/IM741C/IM741E Operational Amplifiers," National Semiconductor Corporation 1982 Linear Databok, pp. 3-257 et seq.
Data Sheet, "IM118/IM218/IM318 Operational Amplifiers," National Semiconductor Corporation 1986 Linear Databook, pp. 3-165 et seq.
Data Sheet "Im101A/IM301A/IM107/IM307 Operational Amplifiers," Linear Technology Corporation 1986 Linear Databook, pp. 2-177 et seq.
Data Sheet, "LT118A/LT318A/IM118/IM318 High Speed Operational Amplifier," National Semiconductor Corporation 1986 Linear Databook, pp. 2-191 et seq.
Data Sheet, "LM101A/LM201A/LM301A Operational Amplifiers," National Semiconductor Corporation 1982 Linear Databook, pp. 3-128 et seq.

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