Centre-tapped spiral inductors for monolithic bandpass filters
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A centre-tapped spiral inductor is proposed for use in fully balanced monolithic bandpass filters. The design consumes only 63% of the area required by two traditional spirals and delivers a common-mode rejection ratio approaching 40 dB. Moreover, the self-resonance frequency is twice that of a traditional grounded spiral of the same inductance value. Enabling higher reactances and Q-values to be achieved. >
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