Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1995-08-01
1997-05-20
Mottola, Steven
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330255, H03F 345
Patent
active
056316062
ABSTRACT:
A fully differential output CMOS power amplifier suitable to be used in a non-volatile memory mixed mode chip for voice record and playback to drive a very low impedance load such as an 8 ohm speaker from a low voltage power supply. This fully differential CMOS power amplifier utilizes a voltage multiplying technique for the input stage, a level shift/gain stage, and a common mode feedback network. It also utilizes native n-MOS having a threshold voltage VT.apprxeq.0v for the folded cascode differential input, native n-MOS (VT.apprxeq.0v) for the source follower output stage, enhancement n-MOS (VT.apprxeq.0.7 v) for the common source output, and a voltage regulator using p-MOS diode connected devices for simulating a resistor divider to regulate the voltage multiplier output. The amplifier also includes a mechanism for crossover distortion reduction at the output driver stage, and a scheme to set the idle current in the output driver n-MOS transistors.
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Information Storage Devices, Inc.
Mottola Steven
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