High Frequency VCO-derived filters
نویسندگان
چکیده
A new method of designing continuous-time monolithic filters derived from well known voltage controlled oscillators (VCOs) is introduced. These VCOderived filters are capable of operating at very high frequencies in standard CMOS processes. Prototype lowpass and band-pass filter designed in a TSMC 0.25 μm process are discussed. Simulation results for the low-pass filter designed for a cutoff frequency of 6 GHz show a THD of –40 dB for 400 mV input peak-peak sinusoidal input. The band-pass filter has a resonant frequency programmable from 4 GHz to 5.18 GHz, a programmable Q from 4 to 89 and mid-band THD of –40 dB for a 200 mV peak-peak sinusoidal input signal.
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