UNIVERSAL ARC FILTERS FOR ARC OSCILATORS WITH AUTOMATIC SEQUENTIAL FILTRATION

UNIVERSAL ARC FILTERS FOR ARC OSCILATORS WITH AUTOMATIC SEQUENTIAL FILTRATION

Článek recenzovaný mimo WoS a Scopus

There are situations, when it is not possible to use standard types of filters, mainly because of demands on using of digital tuning of complex filter and concurrently usage of higher amount of transfer functions, which can be low pass LP, high-pass HP, band-pass BP, band-reject BR, but also low or high-pass notch LPN / HPN and allpass AP. For this purpose, we mostly use 2nd order ARC filters, which contain three or more operational amplifiers (OA). Concerning these blocks, tuning or control of this filter is usually the easiest. Except very familiar known filters as Akerberg Mossberg, Kervin Huelsman Newcomb or Towa Thoma, there is a further amount of circuit connections of universal ARC filters, which enable to realize the transfer function of biquad. The article mainly deals with some other circuits, which are not so familiar, but can be also successfully used as universal filters. These filters realizing required circuit functions with the possibility of tuning of basic parameters of the circuit have been used in special circuits with ARC oscillators for very low distortion with maximum suppression of third harmonics.

There are situations, when it is not possible to use standard types of filters, mainly because of demands on using of digital tuning of complex filter and concurrently usage of higher amount of transfer functions, which can be low pass LP, high-pass HP, band-pass BP, band-reject BR, but also low or high-pass notch LPN / HPN and allpass AP. For this purpose, we mostly use 2nd order ARC filters, which contain three or more operational amplifiers (OA). Concerning these blocks, tuning or control of this filter is usually the easiest. Except very familiar known filters as Akerberg Mossberg, Kervin Huelsman Newcomb or Towa Thoma, there is a further amount of circuit connections of universal ARC filters, which enable to realize the transfer function of biquad. The article mainly deals with some other circuits, which are not so familiar, but can be also successfully used as universal filters. These filters realizing required circuit functions with the possibility of tuning of basic parameters of the circuit have been used in special circuits with ARC oscillators for very low distortion with maximum suppression of third harmonics.

ARC oscilator, universal filter

ARC oscilator, universal filter

FROHLICH, L.; SEDLÁČEK, J.; FRIEDL, M.

2012

10.09.2011

1559-9450

Progress In Electromagnetics

2011

2011

Spojené státy americké

1008

1012

5