Various NLTL frequency comb generator embodiments are disclosed for broadband impedance matching to generate an output signal comprising broadband harmonics of an input signal. The NLTL frequency comb generator comprises a plurality of segments cascaded in series, with each segment comprising a series inductor and a non-linear shunt capacitor. The non-linear shunt capacitor may couple to corresponding series inductors in the same polarity. A broadband biasing circuit feeds a DC bias or DC ground to the non-linear shunt capacitors for broadband input and output impedance matching. The broadband biasing circuit may be a low pass filter to prevent RF signal from leaking through the biasing circuit. The NLTL frequency comb generator, the broadband biasing circuit, and an output DC blocking capacitor may be integrated in a single chip in a compact packaging to achieve a broadband input/output impedance matching without relying on external lumped matching components.