A frequency multiplier is provided. A harmonic generator of the frequency multiplier comprises: a harmonic generating core unit; a first resonant tank which is connected to a first output terminal and a second output terminal of the harmonic generating core unit; and a first feedback circuit which is connected to the first output terminal and the second output terminal of the harmonic generating core unit to change the effective resistance of the first resonant tank.

A frequency multiplier is provided. A harmonic generator of the frequency multiplier comprises: a harmonic generating core unit; a first resonant tank which is connected to a first output terminal and a second output terminal of the harmonic generating core unit; and a first feedback circuit which is connected to the first output terminal and the second output terminal of the harmonic generating core unit to change the effective resistance of the first resonant tank.

An even harmonic multiplier employing complementary current reuse is disclosed. The even harmonic multiplier employs supply voltage and current density scaling to reduce power consumption. Further, by using complimentary NMOS and PMOS transistors, the even harmonic multiplier achieves high areal efficiency. Current reuse causes a reduction in noise at the first harmonic, as the corresponding first harmonic currents from the NMOS and PMOS transistors are in opposite, i.e., canceling, directions. Complementary current reuse is now feasible, as the performance of PMOS transistors at current process nodes is similar to those of NMOS transistors, with appropriate sizing leading to approximately equivalent transconductances. Multiple even harmonic multiplier configurations are possible, with many using transformer circuits at the input and/or the output. The resultant even harmonic multipliers find ready application in millimeter wave radio frequency receivers. The most common even harmonic multiplier is a frequency doubler, which produces a strong second harmonic signal.

An even harmonic multiplier employing complementary current reuse is disclosed. The even harmonic multiplier employs supply voltage and current density scaling to reduce power consumption. Further, by using complimentary NMOS and PMOS transistors, the even harmonic multiplier achieves high areal efficiency. Current reuse causes a reduction in noise at the first harmonic, as the corresponding first harmonic currents from the NMOS and PMOS transistors are in opposite, i.e., canceling, directions. Complementary current reuse is now feasible, as the performance of PMOS transistors at current process nodes is similar to those of NMOS transistors, with appropriate sizing leading to approximately equivalent transconductances. Multiple even harmonic multiplier configurations are possible, with many using transformer circuits at the input and/or the output. The resultant even harmonic multipliers find ready application in millimeter wave radio frequency receivers. The most common even harmonic multiplier is a frequency doubler, which produces a strong second harmonic signal.