Bias current with hybrid temperature profile
AssigneeAnalog Devices, Inc.
InventorsKevin R. WRENNER, Ruida YUN, Kenneth G. RICHARDSON
Life of this patent
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Abstract
Aspects of the present disclosure include a hybrid circuit, including a first current sink configured to sink a zero temperature coefficient (ZTC) current, a second current sink configured to sink a positive temperature coefficient (PTC) current, a first transistor configured to provide a first current, a second transistor configured to provide a second current, a third transistor configured to provide a third current mirroring the ZTC current, a fourth transistor configured to provide a sum current of the first current and the third current, and a current mirror configured provide a hybrid current mirroring the sum current.
Claims24
1-14. (canceled)
A hybrid circuit, comprising:
- a first current sink connected to:
- a zero temperature coefficient (ZTC) current source;
- corresponding gate terminals of a second transistor and a third transistor;
- and
- a ground terminal;
- a transistor connected to:
- a positive temperature coefficient (PTC) current source;
- a corresponding gate terminal of a first transistor;
- and
- the ground terminal;
- the first transistor connected to:
- a corresponding drain terminal of the second transistor;
- a corresponding drain terminal of the third transistor;
- a corresponding drain terminal of a fourth transistor;
- and
- the ground terminal;
- the second transistor connected to:
- the ZTC current source;
- the PTC current source;
- a corresponding gate terminal of the first current sink;
- a corresponding gate terminal of the transistor;
- the corresponding gate terminal of the first transistor;
- the corresponding gate terminal of the third transistor;
- and
- the ground terminal;
- the third transistor connected to:
- the ZTC current source;
- the corresponding gate terminal of the first current sink;
- the corresponding gate terminal of the second transistor;
- a corresponding drain terminal of the first transistor
- the corresponding drain terminal of the fourth transistor;
- and
- the ground terminal;
- the fourth transistor connected to:
- a voltage supply;
- a corresponding gate terminal of a current mirror;
- the corresponding drain terminal of the first transistor;
- and
- the corresponding drain terminal of the third transistor;
- the current mirror connected to the voltage supply.
(canceled)
A hybrid circuit, comprising:
- at least a first current source configured to source a first current having a first temperature slope;
- at least a second current source configured to source a second current having a second temperature slope different than the first temperature slope;
- and
- a circuit with fewer than seven transistors including:
- a first transistor configured to provide a third current having a third current magnitude of a higher of a zero current or a differential current between the second current and the first current,
- a second transistor configured to provide a fourth current having a fourth current magnitude identical to the third current magnitude, and
- a third transistor configured to provide a fifth current having a fifth current magnitude of a lesser of the first current or the second current, wherein a first sum of the fourth current magnitude and a first current magnitude of the first current equals to a hybrid current magnitude of a hybrid current.
A hybrid circuit, comprising:
- at least a first current sink configured to sink a first current having a first temperature slope;
- at least a second current sink configured to sink a second current having a second temperature slope different than the first temperature slope;
- and
- a circuit with fewer than six transistors including:
- a first transistor configured to provide a third current having a third current magnitude of a zero current or a differential current between the second current and the first current,
- a second transistor configured to provide a fourth current having a fourth current magnitude identical to the third current magnitude, and
- a third transistor configured to provide a fifth current having a fifth current magnitude of a lesser of the first current or the second current, wherein a first sum of the fourth current magnitude and a first current magnitude of the first current equals to a hybrid current magnitude of a hybrid current.
A hybrid circuit, comprising:
- a first current source coupled with:
- a zero temperature coefficient (ZTC) current source;
- corresponding gate terminals of a first transistor and a first current mirror;
- and
- a voltage supply;
- a second transistor coupled with:
- a positive temperature coefficient (PTC) current source;
- a corresponding gate terminal of a second current mirror and a corresponding source terminal of the first transistor;
- and
- the voltage supply;
- the second current mirror coupled with:
- a corresponding gate terminal of the second transistor;
- corresponding source terminals of the first transistor and the first current mirror;
- and
- the voltage supply;
- the first transistor coupled with:
- corresponding gate terminals of the first current source, the second transistor, the first current mirror, and the second current mirror;
- and
- the voltage supply;
- and
- the first current mirror coupled with:
- corresponding gate terminals of the first current source and the first transistor;
- and
- a corresponding source terminal of the second current mirror.
Dependencies are inferred from the claim text.