Electrical audio signal processing systems and devices – With amplifier – Feedback
Patent
1997-09-05
2000-03-07
Lee, Ping
Electrical audio signal processing systems and devices
With amplifier
Feedback
381 98, 330109, H03F 2100
Patent
active
060350490
ABSTRACT:
AC coupling and signal amplification using switched capacitors. The use of a switched capacitor to simulate a resistor in amplifier coupling in an integrated circuit processing audio frequency signals avoids the need for external components, reducing cost and eliminating the need for pinouts for the external components. In a system including an anti-aliasing filter, capacitive coupling is used for coupling between amplifiers, with the gain of the second amplifier being set by a feedback capacitor between the amplifier output and its input, as sized relative to the coupling capacitor. The switched capacitor in the feedback loop of the second amplifier preferably couples the output of the anti-aliasing filter back to the amplifier input, thereby minimizing the aliasing from the capacitor switching.
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"Single Chip Voice Message System, Preliminary Specifications", Information Storage Devices, Inc., Aug. 1991.
"ISD1012A/1016A/1020A Single-Chip Voice Record/Playback Devices Data Sheet", Information Storage Devices, Nov. 1992.
Engh Lawrence D.
Hoei Jung Sheng
Sarin Vashal
Information Storage Devices, Inc.
Lee Ping
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