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This invention relates to 2° order, 3 base-stages biquad/universal continuous time (CT) analog active filters type resonant and, more particulary, noiseless active full self-compensation techniques to improve the frequency range, the stability and/or the selectivity of the filters themselves with a very low or as if zero cost, overcoming said problems.
These active filters techniques are revolutionary, because they are the only ones in the world that (fully) extend the limited bandwidth of the operational amplifiers employed using, with new direct connections, a single resistor or an additional operational amplifier that has a functionally filtering output, and without destabilizing the filter itself.
Applications: LF (low frequency) to IF (intermediate frequency), particulary in systems for telecommunications and just for example, as the photo of prototype shows, in a remote reception stage system, where high filtering performances are required to receive and amplifing the signal of interest only, to carry out the right transmitted information to be decoded, without using several filter stages and having system destabilization.

-Very easy to manufacture, no special components or procedures are required;
-They are the most stable (no manual compensation is needed), and the less noisy* CT single-ended analog active filters (*noise is the interference signals and the lower it is, the higher is the device fidelity);
-They are inexpensive and require less space, this means:
-A lower manufacturing cost than the other compensated filters;
-Saving power consumption and integrated chip area making more versatile, reliable the circuit(s) and longer its life. Ideal for devices that have to work in space or for long time without any human intervention, in critical enviromental conditions also.

APPLICATIONS: These type of filters may also be adopted in many electronics products which people use every day, improving considerably their performances, within: Telecommunications, radio systems (IF down-conversion input stage or input unit of a superheterodyne receiving system), walkie talkies, analog/mixed-signal systems, equalizers, SOC (systems on chip), measurement electronic instruments (such as oscilloscopes) and the like.

EXPERIMENTAL TEST: These filters have been carefully studied, go-between thousands of behaviour analysis done by computer using the P.S.P.I.C.E. simulator software, and testing dozen of prototypes.
Several types of analog CT active filters are available today, someone recently patented by great companies too using low noise balanced operational amplifiers also, but they can’t make use of the “Total Parasitic Voltage Control System” (TPVCS). So, mine is the best product in its category for all the above mentioned reasons.

MARKET PERSPECTIVES: This product type has good market into U.S.A., Canada, Europe and China.

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