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US 7,982,542 B1Granted
Power transistor feedback circuit with noise and offset compensation
AssigneeFreescale Semiconductor, Inc.
InventorThierry Sicard
Life of this patent
Estimating the term…
Abstract
A circuit comprises a first amplifier portion and a second amplifier portion. The first amplifier portion includes first and second transistors coupled together in a common-base configuration. A current mirror is coupled to the first and second transistors. A first filter is coupled between a first input and the first and second transistors. The second amplifier portion includes third and fourth transistors coupled together in a common-base configuration. First and second current sources are coupled to the third and fourth transistors. A second filter is coupled between a second input and the control electrodes of the third and fourth transistors, wherein the first and second filters are coupled together.
Claims20
A circuit comprising:
- a first amplifier portion comprising:
- a first transistor having a first current electrode coupled to a first input, a second current electrode, and a control electrode;
- a second transistor having a first current electrode coupled to the first input, a second current electrode, and a control electrode coupled to the control electrode of the first transistor;
- a current mirror coupled to the second current electrodes of the first and second transistors;
- and
- a first filter coupled between the first input and the control electrodes of the first and second transistors;
- and
- a second amplifier portion comprising:
- a third transistor having a first current electrode coupled to a second input, a second current electrode, and a control electrode coupled to the second current electrode of the third transistor;
- a fourth transistor having a first current electrode coupled to the second input, a second current electrode coupled to an output terminal, and a control electrode coupled to the control electrode of the third transistor;
- a first current source having a first terminal coupled to the third transistor, and a second terminal;
- a second current source having a first terminal coupled to the fourth transistor, and a second terminal;
- and
- a second filter coupled between the second input and the control electrodes of the third and fourth transistors, and wherein the first and second filters are coupled together.
11 more elements
A circuit comprising:
- a first amplifier portion comprising:
- a first transistor having a first current electrode coupled to a first input, a second current electrode, and a control electrode;
- a second transistor having a first current electrode coupled to the first input, a second current electrode, and a control electrode coupled to the control electrode of the first transistor;
- a current mirror coupled to the second current electrodes of the first and second transistors;
- and
- a first filter coupled between the first input and the control electrodes of the first and second transistors;
- a second amplifier portion comprising:
- a third transistor having a first current electrode coupled to a second input, a second current electrode, and a control electrode coupled to the second current electrode of the third transistor;
- a fourth transistor having a first current electrode coupled to the second input, a second current electrode coupled to an output terminal, and a control electrode coupled to the control electrode of the third transistor;
- a first current source having a first terminal coupled to the third transistor, and a second terminal;
- a second current source having a first terminal coupled to the fourth transistor, and a second terminal;
- and
- a second filter coupled between the second input and the control electrodes of the third and fourth transistors, and wherein the first and second filters are coupled together;
- and
- a third current source having a first terminal coupled to the second terminals of both the first and second current sources, and a second terminal coupled to a first power supply voltage terminal.
12 more elements
A circuit comprising:
- a first amplifier portion comprising:
- a first transistor having a first current electrode coupled to a first input, a second current electrode, and a control electrode;
- a second transistor having a first current electrode coupled to the first input, a second current electrode, and a control electrode coupled to the control electrode of the first transistor;
- a current mirror coupled to the second current electrodes of the first and second transistors;
- a first capacitor having a first plate electrode coupled to the first input, and a second plate electrode coupled to the control electrodes of the first and second transistors;
- and
- a first resistive element having a first terminal coupled to the control electrodes of the first and second transistors, and a second terminal coupled to the second current electrode of the second transistor;
- and
- a second amplifier portion comprising:
- a third transistor having a first current electrode coupled to a second input, a second current electrode, and a control electrode coupled to the second current electrode of the third transistor;
- a fourth transistor having a first current electrode coupled to the second input, a second current electrode coupled to an output terminal, and a control electrode coupled to the control electrode of the third transistor;
- a first current source having a first terminal coupled to the third transistor, and a second terminal;
- a second current source having a first terminal coupled to the fourth transistor, and a second terminal;
- a second capacitor having a first plate electrode coupled to the second input, and a second plate electrode coupled to the control electrodes of the third and fourth transistors;
- and
- a second resistive element having a first terminal coupled to the control electrodes of the third and fourth transistors, and a second terminal coupled to the second terminal of the first resistive element.
13 more elements
Dependencies are inferred from the claim text.