Switchable MOS current mirror

Details Switchable MOS current mirror Switchable MOS current mirror

1993-01-05

1994-07-12

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including current mirror amplifier

323317, H03F 316

Patent

active

053292472

ABSTRACT:
The present invention relates to a switchable MOS current mirror having an input and an output current branch (1, 2), a plurality of first and second MOS-field-effect transistors, and a circuit section containing a third and a fourth MOS field effect transistor (Q3, Q4). The gate electrodes of the first MOS field-effect transistors are connected respectively to a gate electrode of a second MOS field-effect transistor and to the respective drain electrodes of the first MOS field-effect transistors. The gate electrode of the third and the gate electrode of the fourth MOS field-effect transistor are connected to a control terminal (S) and to the operating voltage (Vb) respectively. To ensure as constant an input current as possible in the first current branch and as clean an output current signal (Ia) as possible with a short rise time, according to the invention capacitors (C1, C2) are provided for furnishing charge currents and are connected between ground or the operating voltage terminal and the connection points of the gate electrodes connected to each other in pairs. Consequently, the gate currents necessary for rendering the second circuit conductive are not branched from the input current (Ie) but from the capacitors.

REFERENCES:
patent: 5204612 (1993-04-01), Lingstaedt

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