Abstract
The design and the measurement results are presented of a low-voltage (1 V) class-AB negative-feedback output amplifier. The amplifier is designed for use in a single-chip LW receiver, which can be put completely in the ear, supplied by a 1 V power supply and is capable of driving a load with an impedance of 30 Ω. The maximum output current of the amplifier is approximately 2.5 mA and its quiescent current is approximately 100 μA. This high efficiency is obtained by means of biasing two of the three amplifying stages in class-AB operation. With the aid of negative feedback, the total harmonic distortion for a single 1 kHz tone at 1 mA level is kept below 1%. The output amplifier is integrated in a bipolar process which has vertical NPN transistors with a maximum f_{T} of 5 GHz and lateral PNP transistors with a maximum f_{T} of 20 MHz.
Published Version
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