Amplifier and the method thereof

A method of amplifying an input signal to generate an output current in an amplifier, comprising:

• providing a first resistor to receive the input signal to generate a matched signal;
• providing a first transistor having a channel thermal noise to establish a first noise voltage;
• providing a second resistor receiving the channel thermal noise to establish a second noise voltage;
• and
• providing a first transconductor circuit with first transconductance to receive the first noise voltage to generate a first noise current;
• and
• providing a second transconductor circuit with second transconductance to receive the second noise voltage to generate a second noise current, such that the first and second noise currents mutually cancel each other out to reduce a noise component in the output current to the load;
• and
• wherein the first and second transconductance have the opposite signs, and the first and second transconductor circuits are operated in a current mode.

An amplifier amplifying an input signal to generate an output current, comprising:

• an impedance matching network receiving the input signal to perform impedance matching thereon, comprising:
• a first resistor, receiving the input signal to generate a matched signal;
• a first transistor coupled to the first resistor, having a channel thermal noise to establish a first noise voltage;
• and
• a second resistor coupled to the first resistor and transistor, receiving the channel thermal noise to establish a second noise voltage;
• and
• a transconductor amplifier coupled to the impedance matching network, comprising:
• a first transconductor circuit with first transconductance, coupled to the first resistor and transistor, receiving the first noise voltage to generate a first noise current;
• and
• a second transconductor circuit with second transconductance, coupled in parallel to the first transconductor circuit and in series to the load, receiving the second noise voltage to generate a second noise current such that the first and second noise currents mutually cancel each other out to reduce a noise component in the output current to the load,
• wherein,
• the first and second transconductances have the opposite signs,
• the first transistor has a first gate, a first drain, and a first source,
• the first transconductor circuit comprises a second transistor having a second gate coupled to the first gate, a second drain, and a second source coupled to the ground,
• the second transconductor circuit comprises:
• a third transistor having a third gate coupled to the first drain, a third drain coupled to a voltage source, and a third source coupled to a current source;
• and
• a fourth transistor having a fourth gate coupled to the ground through a capacitor, a fourth drain coupled to the second drain, and a fourth source coupled to the third source and the current source.

An amplifier amplifying an input signal to generate an output current, comprising:

• an impedance matching network receiving the input signal to perform impedance matching thereon, comprising:
• a first resistor, receiving the input signal to generate a matched signal;
• a first transistor coupled to the first resistor, having a channel thermal noise to establish a first noise voltage;
• and
• a second resistor coupled to the first resistor and transistor, receiving the channel thermal noise to establish a second noise voltage;
• and
• a transconductor amplifier coupled to the impedance matching network, comprising:
• a first transconductor circuit with first transconductance, coupled to the first resistor and transistor, receiving the first noise voltage to generate a first noise current;
• and
• a second transconductor circuit with second transconductance, coupled in parallel to the first transconductor circuit and in series to the load, receiving the second noise voltage to generate a second noise current such that the first and second noise currents mutually cancel each other out to reduce a noise component in the output current to the load;
• and
• wherein the first and second transconductances have the opposite signs, and the input signal is a differential signal pair, the circuit components in the impedance matching network and the transconductor amplifier are constructed by transistor pairs.

A method of amplifying an input signal to generate an output current in an amplifier, comprising:

• providing a first resistor to receive the input signal to generate a matched signal;
• providing a first transistor having a channel thermal noise to establish a first noise voltage;
• providing a second resistor receiving the channel thermal noise to establish a second noise voltage;
• providing a first transconductor circuit with first transconductance to receive the first noise voltage to generate a first noise current;
• and
• providing a second transconductor circuit with second transconductance to receive the second noise voltage to generate a second noise current, such that the first and second noise currents mutually cancel each other out to reduce a noise component in the output current to the load;
• and
• wherein,
• the first and second transconductances have the opposite signs,
• the first transistor has a first gate, a first drain, and a first source,
• the first transconductor circuit comprises a second transistor having a second gate coupled to the first gate, a second drain, and a second source coupled to the ground,
• the second transconductor circuit comprises:
• a third transistor having a third gate coupled to the first drain, a third drain coupled to a voltage source, and a third source coupled to a current source;
• and
• a fourth transistor having a fourth gate coupled to the ground through a capacitor, a fourth drain coupled to the second drain, and a fourth source coupled to the third source and the current source.

A method of amplifying an input signal to generate an output current in an amplifier, comprising:

• providing a first resistor to receive the input signal to generate a matched signal;
• providing a first transistor having a channel thermal noise to establish a first noise voltage;
• providing a second resistor receiving the channel thermal noise to establish a second noise voltage;
• and
• providing a first transconductor circuit with first transconductance to receive the first noise voltage to generate a first noise current;
• and
• providing a second transconductor circuit with second transconductance to receive the second noise voltage to generate a second noise current, such that the first and second noise currents mutually cancel each other out to reduce a noise component in the output current to the load;
• and
• wherein the first and second transconductance have the opposite signs, and the input signal is a differential signal pair, the circuit components in the impedance matching network and the transconductor amplifier are constructed by transistor pairs.