Amplified output stage containing N-channel output transistors a

Details Amplified output stage containing N-channel output transistors a Amplified output stage containing N-channel output transistors a

1995-07-07

1997-06-10

Mullins, James B.

Electricity: electrothermally or thermally actuated switches

Electrothermally actuated switches

Fusible element actuated

330269, H03F 330

Patent

active

056380259

ABSTRACT:
An output stage of an amplifier contains N-channel high-side and low-side transistors for producing an output current. The gate drive circuitry for the transistors includes an N-channel transistor having its gate connected in common with the gate of the low-side transistor to the output of a high-gain input stage amplifier, and having its drain connected to the gate of the high-side transistor. This structure reduces distortion at the crossover between positive and negative output voltages and improves control of the quiescent current. Avoiding a P-channel low-side transistor also reduces the area required for the amplifier on an IC chip and eliminates clipping during negative swings of the output voltage. A capacitive coupling stage is used to prevent clipping during positive swings of the output voltage. When the gate drive for the high-side transistor goes low, a capacitor charges through a diode. When the gate drive goes high again, the diode becomes reverse-biased, and a P-channel transistor turns on to deliver the charge on the capacitor to the gate of the high-side transistor, providing a gate bias above the positive voltage rail. The capacitor can be fabricated in integrated form.

REFERENCES:
patent: 4336503 (1982-06-01), Whatley
patent: 4390803 (1983-06-01), Koike
patent: 4542348 (1985-09-01), Lucas et al.
patent: 5220288 (1993-06-01), Brooks
Analysis and Design of Analog Integrated Circuits, Second Edition, Paul R. Gray and Robert G. Meyer, University of California, Berkeley, pp. 335, 758.
Class-AB High-Swing CMOS Power Amplifier, F. Mistlberger and R. Koch, IEEE Journal of Solid-state Circuits, vol. 27, No. 7, Jul. 1992, pp. 1089-1092.

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