Active low-pass filter

Details Active low-pass filter Active low-pass filter

1995-02-27

1996-02-06

Cunningham, Terry

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

Unwanted signal suppression

330107, 330294, H03H 1112

Patent

active

054898730

ABSTRACT:
An active low-pass filter suitable as a 90.degree. phase shifter circuit is provided which requires few external components when formed as an IC. The current resulting from the input signal outputted from a first impedance element is amplified by a first current amplifier, and the resulting output current is converted by a first converting means to a voltage, which is supplied via a second impedance element to a second current amplifier; the output current of the second current amplifier is converted by a second converting means to a voltage, which is outputted as a filter output, while the current corresponding to the output voltage of the second converting means is negatively fed back into the inputs of the first and second current amplifiers; furthermore, at least the current amplification factor of the first current amplifier is made controllable, thereby permitting the cut-off frequency to be varied arbitrarily.

REFERENCES:
patent: 3792367 (1974-02-01), Fleischer et al.
patent: 4011466 (1977-03-01), Pearlman et al.
patent: 4275453 (1981-06-01), Wagner
patent: 5293086 (1994-03-01), Tanigawa et al.
patent: 5396188 (1995-03-01), Aoki

Affiliated with

Also associated with

Rating

Active low-pass 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 Active low-pass filter, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Active low-pass filter will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2177389