Journal ArticleDOI
MOS switched-capacitor filters with reduced number of operational amplifiers
TLDR
Using voltage inverter switches, exact analog sampled-data equivalents of Rs, Ls and Cs, as well as unit elements, can be designed with MOS capacitors and switches, which allows low power switched capacitor filters without operational amplifiers and with a frequency capability approaching the megahertz range.Abstract:
Using voltage inverter switches, exact analog sampled-data equivalents of Rs, Ls and Cs, as well as unit elements, can be designed with MOS capacitors and switches. Due to the underlying bilinear transformation, no limitation other than the Nyquist limit is imposed on the ratio of corner to sampling frequency. For an nth order filter, the number of voltage inverter switches is (n+1)/4 to (n+1)/2. A 3.4 kHz third-order Chebyshev low-pass CMOS circuit is described in detail. It uses only one voltage inverter switch implemented by a switched op amp integrator. The sampling frequency is 24 kHz, the dynamic range exceeds 70 dB and the chip area is 1.2 mm/SUP 2/. A CMOS voltage inverter switch, which has zero DC power and occupies only 0.09 mm/SUP 2/ is presented, whose dynamic range exceeds 85 dB. This allows low power switched capacitor filters without operational amplifiers and with a frequency capability approaching the megahertz range.read more
Citations
More filters
Journal ArticleDOI
MOS switched-capacitor filters using voltage inverter switches
TL;DR: In this paper, an integrated third-order low-pass filter is proposed, which can be built by means of capacitances, ordinary switches, and voltage inverter switches, the latter being quite simply realizable by electronic means.
Journal ArticleDOI
Performance of integrated dynamic MOS amplifiers
TL;DR: In this article, measured data of two different types of dynamic amplifier which have been integrated in a standard CMOS metal gate technology were presented with a power dissipation of 58 μW and 500 μW at clock frequencies of 10 kHz and 100 kHz.
Switched-capacitor elements for VIS-SC-filters with reduced influences of parasitic capacitances
TL;DR: Three design methods will be presented which reduce the effect of parasitics using filter structures consisting of cascaded earthed elements containing MOS capacitors to substrate to reduce the performance of VIS-SC-filters.
Journal ArticleDOI
Scaling techniques for switched‐capacitor filters employing voltage inverter switches
TL;DR: In this article, the effects of scaling elements in cascade connection with unit elements and gyro-elements are discussed. And the influence of these scaling elements is such that the attenuation characteristic with respect to element variations is fully retained despite the fact that according to the usual definition the losslessness of the reference filter is not preserved.
Journal ArticleDOI
An integrated seventh-order unit element filter in VIS-SC technique
TL;DR: It is shown that the effect of parasitic bottom plate capacitances can be overcome by using a special type of VIS, and the influence of the top plate parasitics on the filter properties is discussed.
References
More filters
Journal ArticleDOI
MOS sampled data recursive filters using switched capacitor integrators
TL;DR: A new technique to analog sampled data filtering is presented which can be fully integrated using MOS technology, and advantages of this new approach are reduced circuit complexity, low sensitivity to coefficient variations, and efficient utilization of silicon area.
Journal ArticleDOI
Design techniques for MOS switched capacitor ladder filters
TL;DR: In this paper, the authors describe design techniques for monolithic, high-precision, MOS sampled-data active-ladder filters, which are used to simulate doubly terminated LC ladder networks.
Journal ArticleDOI
Switched-capacitor filter design using the bilinear z-transform
TL;DR: A general synthesis technique is described for obtaining a switched-capacitor (SC) filter from an active RC prototype that permits the processing of signals at much higher frequencies than do previously known circuit design techniques.
Journal ArticleDOI
MOS switched-capacitor filters using voltage inverter switches
TL;DR: In this paper, an integrated third-order low-pass filter is proposed, which can be built by means of capacitances, ordinary switches, and voltage inverter switches, the latter being quite simply realizable by electronic means.