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US 10,873,303 B2Granted
Amplifier with constant voltage gain
AssigneeTexas Instruments Incorporated
InventorNeil Gibson
Life of this patent
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Abstract
An amplifier includes an input stage. The input stage includes a differential pair and a load circuit. The differential pair includes a first transistor and a second transistor. The first transistor and the second transistor are configured to amplify a received differential signal. The load circuit connects the differential pair to a reference voltage. The load circuit is configured to vary in resistance in inverse proportion to the transconductance of the first transistor and the second transistor.
Claims14
An amplifier, comprising:
- an input stage including:
- a differential pair that includes:
- a first transistor;
- and
- a second transistor;
- and
- a load circuit including:
- a first sub-circuit connected to the first transistor, the first sub-circuit including:
- a third transistor having a first current terminal and a second current terminal, wherein the first current terminal is connected to a current terminal of the first transistor;
- and
- a fourth transistor having a current terminal connected to a reference voltage, wherein the second current terminal of the third transistor is connected to a control terminal of the fourth transistor;
- and
- a second sub-circuit connected to the second transistor, the second sub-circuit including:
- a fifth transistor configured to provide a path for current flow from the second transistor to the reference voltage;
- and
- a sixth transistor, wherein a current terminal of the fifth transistor is connected to a control terminal of the sixth transistor.
13 more elements
An amplifier, comprising:
- a transconductance device configured to apply constant gain to an input signal;
- a load circuit including:
- a first transistor having a first current terminal and a second current terminal, wherein the first current terminal is connected to the output of the transconductance device;
- a second transistor having a current terminal connected to a reference voltage, wherein the second current terminal of the first transistor is connected to a control terminal of the second transistor, and wherein the first transistor and second transistor are configured to produce a constant gain in the transconductance device by varying in resistance in inverse proportion to the transconductance of the transconductance device;
- and
- a third transistor configured to operate as a diode, wherein a control terminal of the third transistor is connected to a control terminal of the first transistor.
3 more elements
An amplifier input circuit, comprising:
- a first transistor;
- and
- a second transistor coupled to the first transistor to form a differential pair;
- and
- a load circuit that connects the first transistor and the second transistor to a reference voltage, the load circuit configured to vary in resistance in inverse proportion to the transconductance of the first transistor and the second transistor, the load circuit including:
- a first subcircuit connecting the first transistor to the reference voltage that includes:
- a third transistor configured to provide a path for current flow from the first transistor to the reference voltage;
- and
- a fourth transistor, wherein a current terminal of the third transistor is connected to a control terminal of the fourth transistor;
- and
- a second subcircuit connecting the second transistor to the reference voltage that includes:
- a fifth transistor configured to provide a path for current flow from the second transistor to the reference voltage;
- and
- a sixth transistor, wherein a current terminal of the fifth transistor is connected to a control terminal of the sixth transistor.
11 more elements
Dependencies are inferred from the claim text.