Fifth-order low-pass filter

Author

Message

< Digital Electronic ~ Fifth-order low-pass filter

eric

Posted: Sun Sep 10, 2006 9:34 am Post subject: Fifth-order low-pass filter

Site Admin Joined: 01 Jan 1970 Posts: 311

H. Bonekamp
The LTC1062 is an integrated fifth-order low-pass filter that stands
out by the absence of any d.c. error. This is achieved by keeping
the actual filter outside the d.c. range to eliminate matters like d.c.
offset and low-frequency interference. It therefore makes the
LTC1062 eminently suitable for filter applications where d.c.
errors cannot be tolerated. A pivotal role in this is played by external
resistor R5. The output signal is fed back to the input of the filter
via external capacitor C4. Network R5-C4, in association with
the internal switched-capacitor network, provides the fifth-order
low-pass function.
The cut-off frequency of the filter is determined by an internal
clock that can be controlled externally. This control is provided by
oscillator IC1, which is configured as an astable multivibrator
(AMV). The filter has an internal divider that can be set for a scaling
factor of 1, 2 or 4. In the present circuit, this factor is set to 4,
resulting in a cut-off frequency equal to 1/400 of the clock frequency.
Since the clock

All times are GMT

Page 1 of 1 Electronics Circuits index ~ Digital Electronic

Topic	Author	Forum
Similar Topics
5 MHz Active Lowpass Filter	eric	Radio Frequency Electronic
Stroboscope filter	eric	Analog Electronic
3-dB Chebyshev Filter/Amplifier	eric	Audio Frequency Electronic

Audio power, headphone and pre Amplifier, Digital audio circuits, Loudspeakers projects
PLC articles, examples, hardware, hints and tips, software