Second-order highpass difference filter

Details Second-order highpass difference filter Second-order highpass difference filter

1996-09-10

1997-12-23

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

Unwanted signal suppression

327561, 327552, 330109, 330303, H03K 500, H03B 104

Patent

active

057011001

ABSTRACT:
A second-order highpass difference filter constructed according to the present invention includes a difference amplifier and a feedback processing circuit. The difference amplifier includes an operational amplifier OP.sub.1, and four resistors R.sub.1, R.sub.2, R.sub.3 and R.sub.4. The feedback processing circuit is composed of two operational amplifiers OP.sub.2 and OP.sub.3, resistors R.sub.5 and R.sub.6, and two serial capacitors C.sub.1 and C.sub.2. The inverting and noninverting terminals of the operational amplifier OP.sub.3 are connected to the output of the difference amplifier and of the operational amplifier OP.sub.2, respectively. The output of the operational amplifier OP.sub.2 is also fed back to the inverting terminal of the operational amplifier OP.sub.2 via the resistor R.sub.5, and the noninverting terminal of the operational amplifier OP.sub.2 is grounded. The output terminal of the operational amplifier OP.sub.3 is connected to the inverting terminal of the operational amplifier OP.sub.2 via the two serial capacitors C.sub.1 and C.sub.2 and to the noninverting terminal of the operational amplifier OP.sub.1 via the resistor R.sub.4. The two serial capacitors C.sub.1 and C.sub.2 are connected therebetween to one terminal of the resistor R.sub.6 of which another terminal is grounded.

REFERENCES:
patent: 3787774 (1974-01-01), Tietze et al.
H.W. Smit et. al.; "A Low-Cost Multichannel Preamplifier for Physiological Signals", IEEE Transactions on Biomedical Engineering, vol. BME-34, No. 4, Apr. 1987; pp. 307-310.

Affiliated with

Also associated with

Rating

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

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1804631