Design for a UWB Down-Conversion Mixer for Multi-Band Applications

In this paper, a CMOS down-conversion mixer for UWB applications is presented. The mixer circuit is designed using a VIS 0.25μm RF CMOS technology, working at the 0.9GHz-10.6GHz frequency range; it will be used in applications such as IEEE WiFi, GSM and WiMAX. The core of the mixer has been designed based on double-balanced cell architecture, and uses the current bleeding method to increase the linearity and improve the conversion gain. We put a resistor on the drain of the MOS between two RF inputs, which will improve the flatness of conversion gain. Regarding the arrangement of the mixer, the RF frequency is set at 0.9GHz- 10.6GHz, the LO frequency 0.8GHz-10.5GHz and the IF of 100MHz. The simulated conversion gain of the mixer is 7± 1dB. The 1dB compression point is higher than -11dBm at high frequency and -9dBm at low frequency. The RF input return loss is well below -11dB, and the LO input return loss is below -10dB. The noise figure is 12.93dB while IF is 100MHz, and the mixer core dissipates 9.8mW under a 1.8 V supply.