Abstract
To alleviate practical limitations in the design of millimetre-wave on-chip image-reject filters, systematic design methodologies are presented. Three low-order filters with high-selectivity and low-loss characteristics are designed and compared. Transmission zeroes are created by means of a quarter-wave transmission line (filter 1) and a series LC resonator (filters 2 and 3). Implemented on silicon germanium, the filters occupy 0.125, 0.064 and 0.079 mm2 chip area including pads. The measured transmission losses across 81–86 GHz E-band frequency range are 3.6–5.2 dB for filter 1, 3.1–4.7 dB for filter 2 and 3.6–5 dB for filter 3 where rejection levels at the image band are >30 dB.
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