Synthesis and Analysis of a Bilinear Grounded Inductor
Abstract
MOS technology and switched-capacitor design techniques have made it feasible to fully integrate active filters. The direct replacement of elements in passive RLC ladder structures with their bilinear equivalents is one method of realizing filters which retain the low sensitivity properties of passive RLC ladder filters. In this thesis a bilinear grounded inductor, which requires only one operational amplifier (op-amp) in its construction, is synthesized from a leap-frog parallel LC structure. In addition, several limits on and aspects of the performance of the bilinear inductor are covered. First, capacitor ratios and their errors as well as parasitic capacitance problems are analyzed and design considerations given that will improve the circuit's response. The influence of noise and nonideal op-amp characteristics on the dynamic range is also calculated and design improvements suggested. Op-amp gain and bandwidth effects are evaluated in terms of the inverting and noninverting integrators in the circuit, and it is determined that they have a negligible effect. Sensitivities, in relation to capacitor ratios, of a second-order, high-pass bilinear filter are calculated to show their similarities to passive RLC circuit sensitivities. Finally, a simple filter is simulated to verify its response and, by implication, the bilinear grounded inductor's performance.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1988
- Accession Number
- ADA218102
Entities
People
- Robert M. Flynn
Organizations
- Air Force Institute of Technology