Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1993-11-19
1995-05-02
Mottola, Steven
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330292, H03F 345
Patent
active
054123445
ABSTRACT:
An amplifier circuit providing high power efficiency and an improved phase margin includes a transconductance input stage, one output of which is connected to an input of a class AB amplifier gain stage to form a compensation node, and the other output of which drives a current gain means, with the outputs of the current gain means and the class AB amplifier forming a current summing output node that is coupled to the compensation node through a compensation capacitor. The phase margin of the amplifier circuit is optimized by selecting the gain of the current gain means to be approximately equal to one plus the ratio of the capacitance of the load to the capacitance of the compensation capacitor.
REFERENCES:
patent: 4963834 (1990-10-01), Yukawa
patent: 5039953 (1991-08-01), Su
Fernandez Dennis S.
GEC Plessey Semiconductor, Inc.
Mottola Steven
Novakoski Leo V.
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