Noise-free, die area efficient cascode circuit

Details Noise-free, die area efficient cascode circuit Noise-free, die area efficient cascode circuit

1983-10-03

1985-10-29

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including field effect transistor

330288, 330300, 330311, H03F 316

Patent

active

045502919

ABSTRACT:
In a circuit in which a common-source junction field effect transistor (JFET) is cascoded with a JFET element, current diversion or division circuits are used to divert a majority of the current passing through the input amplifier stage so that it bypasses the cascode FET without compromising the primary circuit function. The bypassing function is achieved by a current mirror, a current mirror-like circuit, or similar devices such as current sources, current splitters and the like and the circuits may be ratioed to more precisely control the bypass current by the use of emitter area scaling, ratioed emitter degeneration resistors, or both. The resultant cascode circuit is relatively noise-free and can easily be implemented into a monolithic integrated circuit without using excess or unrealistic die areas. Another advantage is that the current dividers or diverters make it easier to bias the cascode FET and a further advantage is that the same techniques can be applied with other than JFET amplifier elements, and with other amplifier devices, differential stages, plural stages, and the like.

REFERENCES:
patent: 3546614 (1970-12-01), Lochstampfer
patent: 4060770 (1977-11-01), Schade, Jr.
Wyland, "FET Cascode Technique Optimizes Differential Amplifier Performance", Electronics, Jan. 18, 1971, pp. 81-84.
Hoefflinger, et al., "Some Design Aspects of M.O.S.L.S.I. Operational Amplifiers", Solid-State and Electron Devices, vol. 3, No. 2, Mar. 1979, pp. 33-40.

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