Amplitude compensated variable bandwidth filter

Details Amplitude compensated variable bandwidth filter Amplitude compensated variable bandwidth filter

1985-06-03

1986-02-04

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including frequency-responsive means in the signal...

330306, H03F 304

Patent

active

045688869

ABSTRACT:
A constant amplitude, variable-bandwidth filter is provided having a variable resistor and a high-Q passive filter cascaded between a pair of amplifiers. The input amplifier having a low output impedance and the output amplifier having a low input impedance. As the resistance of the variable resistor is varied, the Q of the system varies and thus its bandwidth. The gain of the system also varies as the variable resistor is varied. To compensate for the gain variation, a current, equivalent to the value of the output voltage of the input amplifier divided by the value of the equivalent series resistance of the high-Q passive filter, is inserted at the node where the variable resistor and the high-Q passive filter are coupled one to the other. This results in a constant current at resonance being conducted by the high-Q passive filter, independent of the selected overall bandwidth of the filter.

REFERENCES:
patent: 4275453 (1981-06-01), Wagner

Affiliated with

Also associated with

Rating

Amplitude compensated variable bandwidth filter does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Amplitude compensated variable bandwidth filter, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Amplitude compensated variable bandwidth filter will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2343177