Abstract
For cognitive radio application, a harmonic rejection mixer (HRM) with current mirror amplifier is proposed. In the proposed HRM, gain ratio can be set accurately using the current mirror amplifier to achieve high harmonic rejection ratio without mismatch calibration circuits. Furthermore, a harmonic rejection ratio of the HRM is immune to a supply voltage, temperature, and process variation. The HRM can be designed at a lower supply voltage compared to a conventional HRM due to a folded switching stage. The HRM is designed in 0.13 μm CMOS process. A third and fifth-order harmonic rejection ratio of the proposed HRM are 52.6 and 50.8 dB. The harmonic rejection mixer consumes 11.5 mA from 1.5 V supply voltage.
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