Precise current source circuit for bias supply of rf mmic gain block amplifier application

A radio frequency signal amplification system, comprising:

• an amplifier having an input terminal and an output terminal;
• a filtering circuit coupled with the output terminal;
• and
• a current source circuit configured to supply an operation current to the output terminal of the amplifier through the filtering circuit, comprising:
• is a first transistor having a first terminal coupled with a supply voltage;
• a first resistor coupled between the supply voltage and a second terminal of the first transistor;
• a second resistor coupled between a third terminal of the first transistor and the filtering circuit;
• and
• a second transistor having a first terminal coupled with the second terminal of the first transistor, and a second terminal coupled with the third terminal of the first transistor.

A radio frequency signal amplification system, comprising:

• an amplifier having an input terminal and an output terminal;
• a filtering circuit coupled with the output terminal;
• and
• a current source circuit coupled between a supply voltage and the filtering circuit and configured to supply an operation current to the is output terminal of the amplifier through the filtering circuit;
• wherein the current source circuit is configured to limit an average of the operation current in order to not exceed a setting level of the amplifier, and supply a peak current for radio frequency pulse operations of the amplifier.