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US 2020/0052653 A1Published application
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.
Claims29
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.
1 more element
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;
- and
- providing a bias voltage for an amplifying device based on the output signal.
1 more element
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;
- 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.
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 by using the controlled source.
1 more element
Dependencies are inferred from the claim text.