A Monolithic 5 GHz Image Reject Mixer for Wireless LAN applications
نویسندگان
چکیده
A monolithic 5 GHz image reject mixer using a 0.5-μm GaAs MESFET technology is designed and simulated. The Mixer exhibits a 13.56 dB down-conversion gain, a SSB (Single SideBand) noise figure of 11.90 dB, an input IP3 (third order intercept point) of –3.73 dBm and a P1dB (1-dB compression point) of –11.0 dBm. The critical issue in the image reject mixer is the phase accuracy and magnitude balance of the 90° phase shifting network. The proposed image reject mixer realizes a 90° phase shifter on chip. This phase shifting network does not need any phase adjusting to achieve the phase error specification of 3° over a frequency range from 800 MHz to 1GHz. The simulated overall image rejection ratio is better than 50 dB.
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