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US 6,549,070 B1Granted
High gain amplifier with current limited positive feedback
AssigneeAnalog Devices, Inc.
InventorsChau C. Tran, Adrian Paul Brokaw
Life of this patent
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Abstract
A high gain amplifier includes an intermediate gain stage; an output gain stage driven by the intermediate gain stage; an input stage, for driving the intermediate gain stage, which is balanced between positive and negative feedback in normal operation; bias means for driving the input stage to maintain balance between positive and negative feedback in normal operation; and a resistance for limiting the output current of the intermediate stage in response to the input stage being overdriven into positive feedback.
Claims18
A high-gain amplifier comprising:
- an intermediate gain stage;
- an output voltage gain stage driven by said intermediate gain stage;
- an input stage, for driving said intermediate gain stage, which is balanced between positive and negative feedback in normal operation;
- bias means for driving said input stage to maintain balance between positive and negative feedback in normal operation;
- and
- a resistance connected in series with said intermediate gain stage and said output stage, said resistance configured to limit the output current of said intermediate stage in response to said input stage being overdriven into positive feedback.
3 more elements
A high-gain amplifier comprising:
- an intermediate gain stage;
- an output voltage gain stage, said output gain stage including a single transistor;
- an input stage, for driving said intermediate gain stage, which is balanced between positive and negative feedback in normal operation;
- bias means for driving said input stage to maintain balance between positive and negative feedback in normal operation;
- and
- a resistance configured to limit the output current of said intermediate stage in response to said input stage being overdriven into positive feedback.
3 more elements
Dependencies are inferred from the claim text.