Electronics > Projects, Designs, and Technical Stuff
Analog Filters: a Compilation of Standard Transfer Functions (UPDATED 2)
srb1954:
--- Quote from: precaud on October 13, 2022, 12:06:00 pm ---
--- Quote from: mawyatt on February 02, 2021, 06:39:39 pm ---For specific filter types, like Butterworth, Bessel, Chebyshev, Cauer and so on, Zverev's Handbook of Filter Synthesis is a great resource.
--- End quote ---
Confession: That is the only book I have ever stolen from a library and never returned (40 years ago).
--- End quote ---
Zverev's book can be downloaded now so you can return the hard copy version to the library.
seamusdemora:
--- Quote from: precaud on October 13, 2022, 12:06:00 pm ---
--- Quote from: mawyatt on February 02, 2021, 06:39:39 pm ---For specific filter types, like Butterworth, Bessel, Chebyshev, Cauer and so on, Zverev's Handbook of Filter Synthesis is a great resource.
--- End quote ---
Confession: That is the only book I have ever stolen from a library and never returned (40 years ago).
--- End quote ---
The bad news for you is that your former librarian is now a moderator here. lol
tggzzz:
--- Quote from: mawyatt on April 26, 2021, 03:08:48 pm ---Yes, even Zverev referred to this commutating filter, which even predates Zverev's classic reference book by a few years!! However, these Discrete Time Continuous Amplitude (DTCA) filter concepts for other uses evaded general discovery until the Tayloe's Detector in the late 90s and then the PolyPhase, or N-Path Mixers ~2008. We did employ the DTCA commutating filter (as well as DTCA Chirp-Z techniques for Real Time SA) techniques in the early 80s for a narrow band tunable RF filter, but it took another 20~30 years for "other" uses of this very powerful technique to emerge!
--- End quote ---
As I've noted elsewhere, I somehow disinterred a 1960 BSTJ paper and in 1979-81 used it to make a narrowband filter to remove noise.
The concepts and references you raised in your other thread are most interesting. Thanks.
seamusdemora:
--- Quote from: tggzzz on February 16, 2023, 09:57:04 am ---
--- Quote from: mawyatt on April 26, 2021, 03:08:48 pm ---Yes, even Zverev referred to this commutating filter, which even predates Zverev's classic reference book by a few years!! However, these Discrete Time Continuous Amplitude (DTCA) filter concepts for other uses evaded general discovery until the Tayloe's Detector in the late 90s and then the PolyPhase, or N-Path Mixers ~2008. We did employ the DTCA commutating filter (as well as DTCA Chirp-Z techniques for Real Time SA) techniques in the early 80s for a narrow band tunable RF filter, but it took another 20~30 years for "other" uses of this very powerful technique to emerge!
--- End quote ---
As I've noted elsewhere, I somehow disinterred a 1960 BSTJ paper and in 1979-81 used it to make a narrowband filter to remove noise.
The concepts and references you raised in your other thread are most interesting. Thanks.
--- End quote ---
Would you care to make a few remarks regarding the potential utility of these filters toward a superior front end for a WWVB receiver?
WWVB is a narrow-band, LF (60 kHz), AM signal broadcast from Ft. Collins, CO. It is similar to the MSF service in the UK). One of the issues with WWVB is the amount of man-made noise in this LF band. I know that a filter and preamp can improve the S/N ratio, but I've no experience in filter designs (since university). The filter synthesizer I tried came up with what appears to me to be a complex design (10th order!?). I wondered if there wasn't a "better way", and when I read this post I thought, "Maybe this is it?".
Best Rgds,
~S
tggzzz:
--- Quote from: seamusdemora on February 17, 2023, 04:13:13 am ---
--- Quote from: tggzzz on February 16, 2023, 09:57:04 am ---
--- Quote from: mawyatt on April 26, 2021, 03:08:48 pm ---Yes, even Zverev referred to this commutating filter, which even predates Zverev's classic reference book by a few years!! However, these Discrete Time Continuous Amplitude (DTCA) filter concepts for other uses evaded general discovery until the Tayloe's Detector in the late 90s and then the PolyPhase, or N-Path Mixers ~2008. We did employ the DTCA commutating filter (as well as DTCA Chirp-Z techniques for Real Time SA) techniques in the early 80s for a narrow band tunable RF filter, but it took another 20~30 years for "other" uses of this very powerful technique to emerge!
--- End quote ---
As I've noted elsewhere, I somehow disinterred a 1960 BSTJ paper and in 1979-81 used it to make a narrowband filter to remove noise.
The concepts and references you raised in your other thread are most interesting. Thanks.
--- End quote ---
Would you care to make a few remarks regarding the potential utility of these filters toward a superior front end for a WWVB receiver?
WWVB is a narrow-band, LF (60 kHz), AM signal broadcast from Ft. Collins, CO. It is similar to the MSF service in the UK). One of the issues with WWVB is the amount of man-made noise in this LF band. I know that a filter and preamp can improve the S/N ratio, but I've no experience in filter designs (since university). The filter synthesizer I tried came up with what appears to me to be a complex design (10th order!?). I wondered if there wasn't a "better way", and when I read this post I thought, "Maybe this is it?".
Best Rgds,
~S
--- End quote ---
I suggest you read the references in mawyatt's other thread, since they will be much more considered than my response.
https://www.eevblog.com/forum/rf-microwave/polyphase-or-n-path-mixer/
My application required the removal of wideband white noise, not typical out-of-band RF signals. Having said that, yes I think they would be worth investigating, particularly in conjunction with other standard techniques.
Overall it is an interesting topic, one that deserves its own thread, and one that shouldn't divert this "references" thread :)
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version