2003 · 11 citations · 1 references
EngineeringElectrical EngineeringAnalog ElectronicsMicroelectronicsMicrowave EngineeringCmos Circuit DesignComplementary Metal-oxide-semiconductor TechnologyIntegrated Circuit DesignMicrowave FiltersMicrowave Integrated CircuitsRadio-frequency Integrated CircuitsCmos Analog Integrated CircuitsCutoff FrequencyInductor DesignIntegrated Active FiltersIntegrated FiltersLow-pass FiltersNotch FilteringRf Cmos Design
An all-transistor lowpass biquad based on an active inductor for operation up to several gigahertz is presented. A convenient parasitic notch near the passband edge sharpens the transition band. The filter can be tuned via biasing and on-chip varactors. Higher order filters can be constructed by simple direct cascading of the second-order blocks. A fifth-order filter example is designed and simulated in TSMC 0.18-/spl mu/m CMOS technology, with cutoff frequency at 4.57 GHz and passband ripple less than 1 dB.
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