NPN Operational amplifier

Details NPN Operational amplifier NPN Operational amplifier

1982-05-27

1984-08-28

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

333217, H03F 345, H03F 142

Patent

active

044686293

ABSTRACT:
An operational amplifier having an extremely high gain-bandwidth product. The amplifier includes a gain cell with an active negative resistance circuit made up of two matched NPN transistors (18 and 20) with their bases cross-connected to their collectors, and with a differential pair of NPN transistors (14 and 16) having their emitters degenerated through the active negative resistance circuit. The value of the negative resistance is chosen to negate other resistance values in the denominator of a fraction expressing overall amplifier gain, which is therefore maximized. Since no PNP transistors are needed to maximize gain in the amplifier, NPN transistors can be used exclusively, and the amplifier can be more conveniently fabricated in integrated-circuit form, with a desirably wide bandwidth.

REFERENCES:
patent: 3351865 (1967-11-01), Dow et al.
patent: 3390344 (1968-06-01), Squires et al.
patent: 3414831 (1968-12-01), Wilson
patent: 3619797 (1971-11-01), Merrick
patent: 3684973 (1972-08-01), Duck
patent: 3851270 (1974-11-01), Vosteen
patent: 4216436 (1980-08-01), Lefferts

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