Boosted tail-current circuit
AssigneeAnalog Devices, Inc.
InventorsRikky Muller, David Hall Whitney
Life of this patent
Estimating the term…
Abstract
A circuit includes a pair of input transistors configured as a differential pair and having input terminals configured to receive an input voltage. The circuit also includes a first current source connected to and configured to provide a first tail current to the pair of input transistors, the first tail current being a class-A current having a non-zero quiescent value. The circuit also includes a second current source connected to and configured to provide a second tail current to the pair of input transistors, the second tail current being a class-B current having a zero quiescent value and a non-zero non-quiescent value. The second current source is configured to provide the second tail current as a function of the input voltage.
Claims20
A circuit, comprising:
- a pair of input transistors configured as a differential pair and having input terminals configured to receive an input voltage;
- a first current source connected to and configured to provide a first tail current to the pair of input transistors, the first tail current being a class-A current having a non-zero quiescent value;
- and
- a second current source connected to and configured to provide a second tail current to the pair of input transistors, the second tail current being a class-B current having a zero quiescent value and a non-zero non-quiescent value, wherein the second current source is configured to provide the second tail current as a function of the input voltage.
A circuit, comprising:
- a pair of input transistors configured as a differential pair and having differential input terminals connected to and configured to receive an input voltage;
- and
- a class-AB current source connected to and configured to provide a tail current to the pair of input transistors, the tail current having a quiescent portion and a non-quiescent portion, wherein the non-quiescent portion is a function of the input voltage received at the differential input terminals.
A method, comprising:
- receiving an input voltage at input terminals of a pair of input transistors configured as a differential pair;
- providing a first tail current to the pair of input transistors from a first current source, the first tail current being a class-A current having a non-zero quiescent value;
- and
- providing a second tail current to the pair of input transistors from a second current source as a function of the input voltage, the second tail current being a class-B current having a zero quiescent value and a non-zero non-quiescent value.
Dependencies are inferred from the claim text.