An 8-10 GHz Upconversion Mixer, with a Low-Frequency Calibration Loop resulting in better than -73dBc In-Band Spurs
نویسندگان
چکیده
An 8-10 GHz X-band upconversion quadrature mixer stage implemented in 250 nm SiGe BiCMOS is presented. Orthogonality of the spurious responses caused by clock feed through, I/Q mismatch and baseband harmonics after self-mixing was exploited to realize a baseband calibration scheme reducing all in-band spurs down to below -73dBc, for baseband signals up to a bandwidth of 2MHz and with an IF center frequency up to 100MHz. Utilizing a low-frequency output spectrum analysis of an integrated self-mixer at the upconversion mixer output for calibration, eliminates the need for expensive microwave frequency spectrum analyzers. Index Terms — BICMOS integrated circuits, Microwave integrated circuits, Built-in self-test
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