Voltage controlled filter (VCF)
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AS3320-Voltage controlled filter (VCF) |
The AS3320 is a high performance voltage controlled four-pole filter
with on-chip voltage controllable resonance IC. The four independent
sections may be interconnected to provide a wide variety of filter
responses, such as low pass, high pass, band pass and all pass. A single
input exponentially controls the frequency over greater than a ten
octave range with little control voltage feedthrough. Another input
controls the resonance in a modified linear manner from zero to low
distortion oscillation. For those demanding applications, provision has
been made to allow trimming for improved control voltage rejection. Each
filter section features a variable gain cell which is fully temperature
compensated, exhibits a better signal -to-noise ratio and generates its
low distortion predominantly in the second harmonic. The device includes
a minus two volt regulator to ensure low power dissipation and
consequent low warm-up drift.
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FEATURES
- voltage controllable frequency - 12 octave range
-
voltage controllable resonance - from zero to oscillation
- accurate
exponential frequency scale
- accurate linear resonance scale
- low
control voltage feed-through -45dB typical
- filter configurable into LPF,
HPF, all pass, etc.
- low noise: -86dB typical
- low distortion in
passband - 0.1% typical
- low warm up drift
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