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A continuous-time 7th-order Butterworth Gm-C low pass filter (LPF) with on-chip automatic tuning circuit has been implemented for a direct conversion DBS tuner in a 0.35 um SiGe BiCMOS technology. The filterpsilas -3dB cutoff frequency f0 can be programmed from 4 MHz to 40 MHz. Measurement results show that the filter has 0 dB passband gain, 30 nV/Hzfrac12 input referred noise, -3 dBVrms passband...
An 80 MHz bandpass filter with a tunable quality factor of 16-44 using an improved transconductor circuit is presented. The noise optimized biquad structure achieves SNR of 45 dB at IMD of 40 dB. The P-ldB compression point and IIP3 of the filter are -10 dBm and -2.68 dBm, respectively. The proposed filter gives an output of 1.87 Vpp at -ldB compression point in 3.3V supply and consumes 66 mW. It...
We developed a clamped-clamped beam micromechanical resonator for actual use in VHF applications. This three-port resonator showed good frequency spectra with a large peak height of 25 dB and a low background level of -77 dB. We designed a parallel beam layout incorporating this resonator for a bandpass filter. Fabricated bandpass filter has a bandwidth of 3.8 MHz at a center frequency of 97 MHz....
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