R-C ACTIVE BANDPASS FILTERS
| dc.creator | Chong, K W | |
| dc.date.accessioned | 2018-12-06T18:47:26Z | |
| dc.date.available | 2018-12-06T18:47:26Z | |
| dc.date.issued | 1962-10-24 | |
| dc.date.submitted | October 24th, 1962 | en_US |
| dc.description.abstract | The design of an R-C active bandpass filter is discussed. The filter exhibits double "humping" effects similar to these of two tightly coupled identically tuned parallel L-C circuits. The degree of humping can be controlled to give good amplitude flatness and phase linearity within the passband. The active element of the filter is a do feedback amplifier using Ge transistors. The feedback network consists of two identically tuned R-C twin-T's in cascade. Control of the humping is achieved by varying the complex impedance bridging one of the twin-T's. When the source and load impedances are pure resistances a rigid relationship between the source load product and the twin-T parameters is neseeseary for symmetrical skirt-response. By making the source and load impedance complex, the skirt-response is always symmetrical provided the R-C product of the source and load impedances is identical to that of the twin-T. R-C active bandpass filters have been designed to work in the audio and sub-audio frequency ranges. They have a pass-to-reject ratio in excess of 40db with a bandwidth of approximately 40 per cent of the centre frequency using an amplifier with a voltage gain of 250. In a modified version using an *active twin-T" a pass-to-reject ratio in excess of 45db and a bandwidth of 6 per cent of the centre frequency is obtained. The band edges of the modified version are mach steeper. Design-charts showing bandwidth and amplifier-gain for various twin-T parameters have been constructed to suit different amplifier input and output impedances. | en_US |
| dc.identifier.uri | http://hdl.handle.net/10388/11582 | |
| dc.title | R-C ACTIVE BANDPASS FILTERS | en_US |
| dc.type.genre | Thesis | en_US |
| thesis.degree.department | Electrical and Computer Engineering | en_US |
| thesis.degree.discipline | Electrical Engineering | en_US |
| thesis.degree.grantor | University of Saskatchewan | en_US |
| thesis.degree.level | Masters | en_US |
| thesis.degree.name | Master of Science (M.Sc.) | en_US |