Patent ID: 7933576

Claim:
A sub-harmonic mixer, comprising: a mixer core comprising first and second transistors performing switching operations in response to a local oscillator (LO) signal and a radio frequency (RF) signal; a power source applying bias maximizing nonlinearity of the first and second transistors included in the mixer core; an RF port applying an RF signal to the mixer core; an LO port applying an LO signal to the mixer core; and first and second phase delay circuits in which the RF signals applied to the first and second transistors have a 180-degree phase difference, wherein the RF signal provided from the RF port and the LO signal phase-delayed by 90 degrees provided by the first phase delay circuit are applied at a middle electrode node of the first transistor, a power voltage is applied to a first electrode node of the first transistor, and a ground voltage is applied a second electrode node of the first transistor.