Wave transmission lines and networks – Automatically controlled systems – With control of equalizer and/or delay network
Patent
1976-12-27
1978-09-12
Smith, Alfred E.
Wave transmission lines and networks
Automatically controlled systems
With control of equalizer and/or delay network
356 96, 328167, 333 70A, H03H 710
Patent
active
041141172
ABSTRACT:
A tunable electrical filter is disclosed wherein an RC (resistor-capacitor) network comprising a plurality of switchable capacitors among the components determining the time constant of the filter provides a given minimum value of filter time constant and, therefore, a given minimum bandwidth, when all the capacitors are continuously connected in the network. Each capacitor is coupled to the network through the output means of an electronic switching means. A pulse generator connected to the input means of said switching means provides a train of pulses having an adjustable ON-time to OFF-time ratio. When all the capacitors are periodically switched by the output of the pulse generator, the effective filter time constant increases from said given minimum value as the ON-time compared with the OFF-time decreases. The pulse generator is provided with control means for adjusting the ON-time to OFF-time ratio. Operation of the control means will, therefore, enable the filter to be tuned within a predetermined range.
REFERENCES:
patent: 3409373 (1968-11-01), Matthews
patent: 3526858 (1970-09-01), Heinlein et al.
patent: 3549903 (1970-12-01), Lowdensiager
patent: 3604947 (1971-09-01), Puthuff
patent: 3669551 (1972-06-01), Bucher et al.
patent: 3701059 (1972-10-01), Nyswander
patent: 3895315 (1975-07-01), Way
patent: 3930727 (1976-01-01), Vergato
Barlow Harry E.
Crane John D.
Giarratana Salvatore A.
Masselle Francis L.
Smith Alfred E.
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