Electric filter circuit consisting of charge transfer device (CT

Details Electric filter circuit consisting of charge transfer device (CT Electric filter circuit consisting of charge transfer device (CT

1978-01-23

1981-05-19

Nussbaum, Marvin L.

Wave transmission lines and networks

Coupling networks

Frequency or time domain filters and delay lines utilizing...

307221D, 333166, H03H 1700, H03H 1100, G11C 1928

Patent

active

042688060

ABSTRACT:
A filter comprising a cascade arrangement of closed line CTD filtering loops has an intermediate CTD coupling loop formed with the adjoining output coupling of the preceding filter loop and input coupling of the succeeding filter loop. Disturbing self-oscillations outside the desired passband are eliminated by adjusting the voltage amplification factors of the amplifiers within the intermediate coupling loop, for example to from about five percent to about fifteen percent less than values selected to give a pure reactance branching circuit at the middle pass frequency. The resulting slight distortion of the transmission characteristic in the pass band of the filter can then be compensated by adjusting the amplifications of other amplifiers, and if necessary the capacitance conditions can be additionally altered.

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