MOS-only design automation and a simple agile MOS-only BP/LP filter design
In this work, a systematic of the automation in the result of the re-obtained small signal parameters based on SPICE is presented for MOS-Only circuits. Accuracy of the re-obtained parameters was improved by re-formulating in the basis of SPICE and CADENCE-SPECTRE. Moreover, piece-wise polynomial regressive models are presented for gds, gm and Ids-Also, performance of the models are compared with conventional expressions. Success of the given MOS-Only design automation based on re-obtained small signal parameters is verified with an examplary new agile filter.
A novel low power MOSFET-C band pass filter for low frequency applications with subthreshold models based on polynomial regression
A novel current mode MOSFET-C filter is presented for a wide range of low frequency applications ranging from biomedical signal sensing up to speech processing region. Presented filter consumes only 2.3 µW with symmetrical supply voltages as low as ± 0.5 V. The filter structure can be easily adjusted by means of changing external capacitor values. Furthermore, proposed filter is given with a novel design methodology based on polynomial regressive small signal models. In this way, promising interaction between design parameters such as VGS, VDS, channel width (W), channel length (L) and filter specifications such as f0, Q and power is provided. Simulation results with 0.18 µm TSMC CMOS technology are given, furthermore proposed filter is tested to process a real fetal PCG signal at 355.4 Hz. It is shown that proposed filter attains a promising performance in comparison with the previously presented counterparts for low frequency applications.
A -Band-Frequency Agile Microstrip Bandpass Filter Using a Thin-Film HTS/Ferroelectric/Dielectric
In this paper, we report on YBa Cu O (YBCO) thin-film/SrTiO (STO) thin-film -band tunable bandpass filters on LaAlO (LAO) dielectric substrates. The two-pole filter has a center frequency of 19 GHz and a 4% bandwidth. Tunability is achieved through the nonlinear dc electric-field dependence of the relative dielectric constant of STO . A large tunability ( , where is the center frequency of the filter at no bias and is the center frequency of the filter at the maximum applied bias) of greater than 10% was obtained in YBCO/STO/LAO microstrip bandpass filters operating below 77 K. A center frequency shift of 2.3 GHz (i.e., a tunability factor of approximately 15%) was obtained at a 400-V bipolar dc bias, and 30 K, with minimal degradation in the insertion loss of the filter. This paper addresses design, fabrication, and testing of tunable filters based on STO ferroelectric thin films. The performance of the YBCO/STO/LAO filters is compared to that of gold/STO/LAO counterparts.