LOW NOISE AMPLIFIER WITH IMPROVED ABSOLUTE MAXIMUM RATING PERFORMANCE

1 . A low noise amplifier with improved absolute maximum rating performance, comprising:

at least one transistor utilized to amplify a input signal externally input through an input line of the low noise amplifier;

a bias unit connected to the input line and configured to set a driving condition of the transistor;

impedance matching unit configured to match an impedance of the low noise amplifier;

a blocking capacitor connected to the input line and configured to block a direct current of the input signal; and

a first diode unit connected to a first end of the transistor and a second end of the transistor, the first diode unit configured to adjust a voltage between the first end of the transistor and the second end of the transistor under a first standard voltage.

2 . The low noise amplifier with improved absolute maximum rating performance according to claim 1 , wherein the transistor is a field-effect transistor; the first standard voltage is a maximum rating voltage between the first end of the transistor and the second end of the transistor; the first diode unit comprises two diodes arranged back-to-back.

3 . The low noise amplifier with improved absolute maximum rating performance according to claim 1 further comprising a second adjusting unit connected to a driving power line of the low noise amplifier; wherein the second adjusting unit is configured to adjust a voltage between the first end of the transistor and a third end of the transistor under a second standard voltage.

4 . The low noise amplifier with improved absolute maximum rating performance according to claim 3 , wherein the second adjusting unit consists of the driving power line in parallel with more than one transistors.

5 . The low noise amplifier with improved absolute maximum rating performance according to claim 3 , wherein

the second adjusting unit is connected between the driving power line and the signal line, and the second adjusting unit is configured to switch a driving power of the low noise amplifier to different voltages according to voltage of the input signal, wherein the driving power is applied on the driving power line;

the different voltages are utilized to adjust the voltage between the first end of the transistor and the third end of the transistor below the second standard voltage.

6 . The low noise amplifier with improved absolute maximum rating performance according to claim 5 , wherein the second adjusting unit comprises:

a signal generator connected with the input line and configure to output an enable signal in response to a voltage of the input signal being higher than a predetermined detecting voltage; and

a voltage regulator having an input end and an output end, where the input end of the voltage regulator is connected with the signal generator, the output end of the voltage regulator is connected with the driving power line for determining whether the enable signal is generated, wherein the voltage regulator is utilized to transfer the driving power into the different voltages applied on the driving power line.

7 . The low noise amplifier with improved absolute maximum rating performance according to claim 6 , wherein the signal generator comprises:

a signal detector connected with the input line and configured to detect a voltage of the input signal;

a comparator connected between the signal detector and the voltage regulator and configured to compare the voltage of the input signal with the predetermined detecting signal, and configure to output the enable signal in response to the voltage of the input signal being higher than the predetermined detecting signal;

wherein the voltage regulator switches the driving power to a low voltage of the different voltages in response to the enable signal is output, the voltage regulator switches the driving power to a high voltage of the different voltages in response to the enable signal is not output.

8 . The low noise amplifier with improved absolute maximum rating performance according to claim 6 , wherein the voltage regulator is a low-dropout regulator.

9 . The low noise amplifier with improved absolute maximum rating performance according to claim 1 further comprising a third diode unit, wherein the third diode unit is connected with the input line for adjusting the voltage of the input signal below a third standard voltage.

10 . The low noise amplifier with improved absolute maximum rating performance according to claim 9 , wherein the third diode unit includes two diodes arranged back-to back.

11 . The low noise amplifier with improved absolute maximum rating performance according to claim 1 , wherein

the transistors comprises an input transistor connected with the input line and an output transistor connected with the driving power line of the low noise amplifier, sources of the plurality of the transistors are coupled and gates of the plurality of the transistors are coupled;

wherein the first diode unit is connected between a first end of the input transistor and a second end of the output transistor.

12 . The low noise amplifier with improved absolute maximum rating performance according to claim 3 , wherein

the transistors comprises an input transistor connected with the input line and an output transistor connected with the driving power line of the low noise amplifier, wherein the transistor consist of a plurality of transistors, sources of the plurality of the transistors are coupled and gates of the plurality of the transistors are coupled;

the second adjusting unit is utilized to adjust a voltage between a third end of the output transistor and a first end of the output transistor below the second standard voltage.