Patent ID: 9130508
Filing Date: 2015-09-08
Classification: H03D

Abstract:
1. A mixer comprising: a field effect transistor having a source, a drain and a gate; an input port coupled to a first end of a first micro-strip line, wherein a second end of the first micro-strip line is connected to either the source or to the drain of the field effect transistor; an output port coupled to a first end of a second micro-strip line, wherein a second end of the second micro-strip line is connected to the drain of the field effect transistor if the input port is coupled to the source by the first micro-strip line, or connected to the source of the field effect transistor if the input port is coupled to the drain by the first micro-strip line; a shunt resistor capacitor termination connected to the gate; a third micro-strip line, the third micro-strip line having a first end and a second end; a local oscillator (LO) directly connected to the first end of the third micro-strip line; and the second end of the third micro-strip line connected to the gate and connected to the shunt resistor capacitor termination; wherein the LO has an LO frequency for mixing with a first frequency on the input port to produce a second frequency on the output port; wherein the shunt resistor capacitor termination comprises a resistor in series with a capacitor; and wherein the shunt resistor capacitor termination is configured to reduce conversion loss of the mixer due to a self-resonance of a capacitance of the gate and an inductance of the third micro-strip line.