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US 11,190,137 B2Granted
Amplifier, circuit for trimming a bias voltage, method for amplifying an input signal and method for trimming a bias voltage
AssigneeAdvantest Corporation
InventorAnton Thoma
Life of this patent
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Abstract
An amplifier includes an amplifying device and a bias circuit for providing a bias voltage for the amplifying device. The bias circuit is configured to provide the bias voltage in dependence of an output signal of an optical coupling arrangement which provides for electrical isolation.
Claims26
An amplifier, comprising:
- an amplifying device;
- an optical coupling arrangement operable to generate an output signal and to provide an electrical isolation;
- and
- a bias circuit for providing a bias voltage for the amplifying device based on the output signal,
- wherein the bias circuit is configured to adjust the bias voltage based on the output signal of the optical coupling arrangement when an operating point of the amplifying device deviates from a desired operating point during operation of the amplifying device.
2 more elements
A method for amplifying an input signal comprising:
- providing an optical coupling arrangement operable to provide an electric isolation;
- outputting an output signal from the optical coupling arrangement;
- providing a bias voltage for an amplifying device based on the output signal;
- and
- adjusting the bias voltage based on the output signal from the optical coupling arrangement when an operating point of the amplifying device deviates from a desired operating point during operation of the amplifying device.
2 more elements
A circuit for trimming a bias voltage, comprising:
- a controlled source, wherein the controlled source is controlled via an optical control signal;
- and
- a first resistor coupled to a control terminal of an amplifying device to provide the trimmed bias voltage to the amplifying device,
- wherein the first resistor is coupled in parallel to the controlled source, and
- wherein the controlled source is configured to change a voltage drop across the first resistor to trim the bias voltage based on a measurement of a characteristic of an output signal of the amplifying device during operation of the amplifying device.
2 more elements
A method for trimming a bias voltage comprising:
- providing a controlled source;
- controlling the controlled source via an optical signal;
- and
- changing a voltage drop across a first resistor coupled in parallel to the controlled source to trim the bias voltage for an amplifying device using the controlled source based on a measurement of a characteristic of an output signal of the amplifying device during operation of the amplifying device.
1 more element
Dependencies are inferred from the claim text.