Low voltage signal path in a radio frequency signal generator

A system, comprising:

• a radio frequency signal generator which is configured to convert a baseband signal to a radio frequency signal, the radio frequency signal generator comprising:
• a baseband filter stage comprising a voltage-mode filter circuit which is configured to filter the baseband signal and generate a voltage signal on an output terminal of the voltage-mode filter circuit;
• an output stage configured to generate and output the radio frequency signal, the output stage comprising a plurality of current-mode stages including a baseband input stage, wherein the baseband input stage comprises an input transistor which comprises a gate terminal coupled to the output terminal of the voltage-mode filter circuit, and a source terminal coupled to a regulated node;
• and
• a regulation circuit configured to adjust a voltage level on the regulated node to maintain a constant gate-source bias voltage for the input transistor to generate a current for biasing the current-mode stages of the output stage.

A system, comprising:

• a quantum processor comprising at least one superconducting quantum bit;
• an arbitrary waveform generator comprising at least one arbitrary waveform generator channel configured to convert a baseband signal to a radio frequency control pulse which controls the at least one superconducting quantum bit, wherein the at least one arbitrary waveform generator channel comprises:
• a baseband filter stage comprising a voltage-mode filter circuit which is configured to filter the baseband signal and generate a voltage signal on an output terminal of the voltage-mode filter circuit;
• an output stage configured to generate and output the radio frequency control pulse, the output stage comprising a plurality of current-mode stages including a baseband input stage, wherein the baseband input stage comprises an input transistor which comprises a gate terminal coupled to the output terminal of the voltage-mode filter circuit, and a source terminal coupled to a regulated node;
• and
• a regulation circuit configured to adjust a voltage level on the regulated node to maintain a constant gate-source bias voltage for the input transistor to generate a current for biasing the current-mode stages of the output stage.

A system, comprising:

• a radio frequency signal generator which is configured to convert a baseband signal to a radio frequency signal, the radio frequency signal generator comprising:
• a baseband filter stage comprising a voltage-mode filter circuit which is configured to filter the baseband signal and generate a voltage signal on an output terminal of the voltage-mode filter circuit;
• a mixer stage comprising a voltage-mode mixer circuit which is configured to convert the filtered baseband signal to the radio frequency signal;
• an output stage comprising a plurality of current-mode stages including a radio frequency signal input stage, wherein the radio frequency signal input stage comprises an input transistor which comprises a gate terminal coupled to the output terminal of the voltage-mode mixer circuit, and a source terminal coupled to a regulated node;
• and
• a regulation circuit configured to adjust a voltage level on the regulated node to maintain a constant gate-source bias voltage for the input transistor to generate a current for biasing the current-mode stages of the output stage.

A method, comprising:

• generating a voltage signal on an output terminal of a voltage-mode filter circuit;
• applying the voltage signal to a gate terminal of an input transistor of a current-mode output circuit, wherein the input transistor comprises a source terminal coupled to a regulated node;
• and
• adjusting a voltage level on the regulated node to maintain a constant gate-source bias voltage for the input transistor to generate a current for biasing the current-mode output circuit.