MOS Cascode current mirror

Details MOS Cascode current mirror MOS Cascode current mirror

1984-05-16

1985-10-29

Beha, Jr., William H.

Electricity: power supply or regulation systems

Self-regulating

Using a three or more terminal semiconductive device as the...

330288, G05F 308

Patent

active

045502846

ABSTRACT:
An MOS current mirror is disclosed which comprises only two circuit branches and requires only a single reference current. The input circuit branch includes at least four MOS transistors (40, 42, 44, 46) connected in series and the output circuit branch includes at least two MOS transistors (48, 50) interconnected with selected transistors of the input circuit branch. Mirroring of the input current (I.sub.REF) is accomplished by providing a transistor (46, 50) in each circuit branch with identical operating characteristics (V.sub.DS, V.sub.GS). High output impedance is achieved in accordance with the present invention by adjusting the channel constant (Z/L) of another transistor (42) in the input circuit branch to be one-third the value of the channel constant associated with each of the remaining transistors.

REFERENCES:
patent: 3852679 (1974-12-01), Schade, Jr.
patent: 3887879 (1974-06-01), Radovsky
patent: 4281261 (1981-07-01), Adam
patent: 4297646 (1981-10-01), LoCascio et al.
patent: 4327321 (1982-04-01), Suzuki et al.
patent: 4412186 (1983-10-01), Nagano
patent: 4471292 (1984-09-01), Schneck et al.
patent: 4477782 (1984-10-01), Swanson

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