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US 6,664,857 B2Granted
Two-stage operational amplifier
AssigneeInfineon Technologies AG
InventorUdo Ausserlechner
Life of this patent
Estimating the term…
Abstract
A two-stage operational amplifier has an input stage and a downstream output stage. In this configuration, the magnitude of a first supply potential which supplies the input stage and is provided by a device for voltage reduction is smaller than that of a second supply potential which supplies the output stage. With a small chip area, as a result of predominantly being able to use standard MOS components, and with a low power requirement, high output voltages are possible at the output of the operational amplifier.
Claims10
A two-stage operational amplifier, comprising:
- an input stage having an input for receiving a signal to be amplified and an output providing a first amplified signal;
- an output stage having an input side connected to said output of said input stage and an output providing a second amplified signal;
- and
- a voltage regulator having an output connected to said input stage and supplying said input stage with a first supply potential and an input connected to said output stage and supplying said output stage with a second supply potential;
- said output stage having at least one output transistor and a quiescent-current setting circuit provided for said output transistor, said quiescent-current setting circuit connected to said output of said voltage regulator and receiving the first supply potential.
2 more elements
Dependencies are inferred from the claim text.