Low noise amplifier in monolithic integrated circuit

Claim 1

In an amplifier embodied in a monolithic integrated circuit and including an input impedance circuit having two capacitors and an inductor, an output impedance circuit having a capacitor, and a transistor amplifying component interposed in a cascade connection between the input and output impedance circuits, the improvement comprising: a first resistor; a first MESFET having a source terminal and a drain terminal for switching a positive voltage that appears at said drain terminal and is passed through said first resistor to a source terminal in response to an output signal generated from the input impedance circuit; a first impedance component having a resistor and a capacitor coupled in parallel and connected to a first inductor connected to said source terminal of said first MESFET so as to control an amplifying rate of said first MESFET; a conducting resistor for carrying a signal at said drain terminal of said first MESFET to a ground after said signal was passed through a DC blocking capacitor; a second inductor; a second MESFET having a source terminal and a drain terminal for switching a positive voltage that appears at said second MESFET drain terminal and is passed through said second inductor to said second MESFET source terminal in response to a signal voltage at said conducting resistor; a second impedance component having a resistor and a capacitor in parallel and connected to said second MESFET source terminal so as to control an amplifying rate of said second MESFET; and a capacitor for connecting said first MESFET drain terminal to a node which connects together terminals of said first and second impedance components and of said conducting resistor in common and is connectable to a ground by means of a bonding wire.