Design of Diplexer-matching Dual-band Active Load Mixer with Master-Slave IF Active Filter

The proposed design is a low-power dual-frequency active load mixer with master-slave intermediate frequency active filter applied to 2.4GHz (ISM-Band) /5.7GHz (U-NII band). The measured results of mixer adopt the conversion gain of 12dB, the noise index of 14.5dB, and the IIP
3
of −6.9dBm at 2.4GHz; the conversion gain of 14.5dB, the noise index of 10.3dB, and the IIP
3
of −6.9dBm at 5.7GHz. Using LC-tank to filter the output harmonic of mixer. Negative resistor compensation circuit can propose optimized Q of LC-tank. Using the $\text{V}_{\text{control}}$ of VCO in PLO can finetune the center frequency of the filter. The experimental of filter present the noise Figure of 11.8dB, input P
ldB
of −23dBm and the IIP
3
of – 14dBm at 3dB attenuation from 0dB and 20MHz bandwidth. After gain adjustment, the noise Figure of 21dB, input P
ldB
of – 10dBm and IIP
3
of −7dBm at input loss of 10dB. The power consumption of 6.8/ 7.4mW at 2.4/ 5.7GHz, respectively.