Enhanced frequency band wideband receiver using N-path Miller bandpass filter

This paper presents the design and modelling result of the wideband receiver topology with an enhanced frequency band using Miller N-path bandpass filter and harmonic-rejection mixing technique. The wideband receiver has the form of monolithic microwave integrated circuits (MMIC) based on domestic GaAs pHEMT technology. The receiver consists of low noise amplifier (LNA), commutated network and harmonic recombination circuit. When using inductors to compensate the parasitic capacitances, the bandwidth of the LNA significantly increases from 0–2.3 GHz to 0–5 GHz, thereby increasing the receiver frequency band to 0.3–3 GHz. The receiver achieves a gain of 15 dB, a noise figure of < 4 dB, an out-of-band IIP3 of +8 dBm, and a harmonic-rejection ratio at the third- and fifth-order local oscillator harmonics of > 50 dB.