A mixer circuit designed for low voltage operation with rail-to-rail local signals. First and second transistors form a first input section to produce a first signal. Third and fourth transistors form a second input section to produce a second signal. Fifth and sixth transistors form a third input section to produce a third signal. Seventh and eighth transistors form a fourth input section to produce a fourth signal. A differential RF input signal drives the first, third, fifth, and seventh transistors, while a differential local signal drives the second, fourth, sixth, and eighth transistors. Ninth and tenth transistors form a positive output section to produce a non-inverted output signal. Eleventh and twelfth transistors form a negative output section to produce an inverted output signal. The ninth to twelfth transistors are driven by the first to fourth signals, respectively.