Abstract
In the design of active biquads with negative feedback frequently
referred to as Sallen-Key networks the assumption of a low
quality- or Q-factor is recommended in order to keep the active
sensitivities at a reasonable low value. In this paper it will be
shown that it is possible to design and to implement the Sallen-
Key biquad even in the high-Q case with reasonable sensitivities.
The method is based on the unity gain version of the biquad and as
unity gain buffer amplifiers are readily manufactured in
integrated circuit technology the results may be very useful in
the fabrication of integrated analog filters in voltage-mode as
well as current-mode technology. As an example we will choose the
band-pass biquad as biquads of this type often has to be designed
with high-Q values. The results in the band-pass case may readily
be transferred to the low-pass and high-pass cases.
Original language | English |
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Journal | International Journal of Circuit Theory & Applications |
Volume | 25 |
Issue number | 4 |
Pages (from-to) | 307-316 |
ISSN | 0098-9886 |
Publication status | Published - 1997 |