Integrated circuit with an amplifier

Details Integrated circuit with an amplifier Integrated circuit with an amplifier

2006-07-11

2006-07-11

Pascal, Robert (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

Reexamination Certificate

active

07075367

ABSTRACT:
An amplifier circuit comprises an input transistor Q1with a first control electrode coupled to the input In and a first main current channel coupled to the internal node10. An output transistor Q4has a second control electrode coupled to the internal node10and a second main current channel coupled to the output Out of the amplifier. An internal transistor Q2has a third main current channel coupled to the internal node10. The internal transistor Q2serves to modify the impedance at the internal node10, but a main low-frequency gain path from the first main channel Q1to the second control electrode does not pass through the third main current channel Q2. The internal node10is coupled to ground via the third main current channel Q2and a resistive element R1successively. The resistance value of the resistive element R1causes poles of a transfer function of the amplifier circuit to develop an imaginary frequency (resonant) component.

REFERENCES:
patent: 4879520 (1989-11-01), Cotreau
patent: 5304946 (1994-04-01), Sano et al.

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