Low noise amplification circuit

A low noise amplification circuit, comprising a RF amplification circuit, an output impedance matching circuit, an attenuation network, a passive attenuation path and an impedance regulation network;

• one end of the RF amplification circuit is connected with a signal input end, and another end is connected with the output impedance matching circuit;
• one end of the output impedance matching circuit is connected with the RF amplification circuit, and another end is connected with the attenuation network;
• one end of the attenuation network is connected with the output impedance matching circuit, and another end is connected with a signal output end;
• one end of the passive attenuation path is connected with the signal input end, and another end is connected with a connection node between the output impedance matching circuit and the attenuation network;
• and
• the impedance regulation network is configured to, in a first working mode, resonate with a parasitic capacitance generated by the attenuation network, in a second working mode, resonate with a parasitic capacitance generated by the attenuation network and the passive attenuation path, so as to realize impedance matching;
• wherein the output impedance matching circuit comprises an adjustable capacitance unit and an impedance matching unit;
• one end of the adjustable capacitance unit is connected with the RF amplification circuit, and another end is connected with the attenuation circuit;
• and
• one end of the impedance matching unit is connected with a power supply, and another end is connected with a connection node between the RF amplification circuit and the adjustable capacitance unit.

A low noise amplification circuit, comprising a RF amplification circuit, an output impedance matching circuit, an attenuation network, a passive attenuation path and an impedance regulation network;

• one end of the RF amplification circuit is connected with a signal input end, and another end is connected with the output impedance matching circuit;
• one end of the output impedance matching circuit is connected with the RF amplification circuit, and another end is connected with the attenuation network;
• one end of the attenuation network is connected with the output impedance matching circuit, and another end is connected with a signal output end;
• one end of the passive attenuation path is connected with the signal input end, and another end is connected with a connection node between the output impedance matching circuit and the attenuation network;
• and
• the impedance regulation network is configured to, in a first working mode, resonate with a parasitic capacitance generated by the attenuation network, in a second working mode, resonate with a parasitic capacitance generated by the attenuation network and the passive attenuation path, so as to realize impedance matching:
• wherein the attenuation network comprises at least two attenuation units, at least two unit selection switches and one attenuation selection switch;
• the at least two attenuation units are arranged in series between the output impedance matching circuit and the signal output end to form a series attenuation circuit;
• each unit selection switch is connected in parallel with one attenuation unit;
• and the attenuation selection switch is connected in parallel with the series attenuation circuit.