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Path: ...!news.nobody.at!eternal-september.org!feeder3.eternal-september.org!news.eternal-september.org!eternal-september.org!.POSTED!not-for-mail From: Bill Sloman <bill.sloman@ieee.org> Newsgroups: sci.electronics.design Subject: Re: Current mirror version of the lowish distortion 1kHz sine wave osillator Date: Wed, 22 Jan 2025 11:31:58 +1100 Organization: A noiseless patient Spider Lines: 43 Message-ID: <vmpea3$gn9c$1@dont-email.me> References: <vm89vp$2ulja$1@dont-email.me> <vmlpii$364is$7@dont-email.me> <vmninh$3t6oi$1@dont-email.me> <vmogqg$23tl$1@nnrp.usenet.blueworldhosting.com> <vmojn9$1slm$1@nnrp.usenet.blueworldhosting.com> <uitvojh0a603a326e46go11qqcc1o1sv3p@4ax.com> <vmott5$1gf6$1@nnrp.usenet.blueworldhosting.com> <cevvojh438uc9pp333nmpvhg4bggb87i04@4ax.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Injection-Date: Wed, 22 Jan 2025 01:32:04 +0100 (CET) Injection-Info: dont-email.me; posting-host="3ed1573c575724b93cab3b019bd7024a"; logging-data="548140"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX18CRthaux5rQCQP/xNE3U9qvWgeQKpDBE8=" User-Agent: Mozilla Thunderbird Cancel-Lock: sha1:7lrms9vWq3L9nMFOACjOTuXawqk= X-Antivirus: Norton (VPS 250121-12, 22/1/2025), Outbound message In-Reply-To: <cevvojh438uc9pp333nmpvhg4bggb87i04@4ax.com> Content-Language: en-US X-Antivirus-Status: Clean Bytes: 3023 On 22/01/2025 7:09 am, john larkin wrote: > On Tue, 21 Jan 2025 14:52:03 -0500, "Edward Rawde" > <invalid@invalid.invalid> wrote: > >> "john larkin" <jl@glen--canyon.com> wrote in message news:uitvojh0a603a326e46go11qqcc1o1sv3p@4ax.com... >>> On Tue, 21 Jan 2025 11:58:15 -0500, "Edward Rawde" >>> <invalid@invalid.invalid> wrote: >>> >>>> "Edward Rawde" <invalid@invalid.invalid> wrote in message news:vmogqg$23tl$1@nnrp.usenet.blueworldhosting.com... >>>>> "Bill Sloman" <bill.sloman@ieee.org> wrote in message news:vmninh$3t6oi$1@dont-email.me... >>>>>> On 21/01/2025 2:19 am, Bill Sloman wrote: >>>>>>> On 15/01/2025 11:33 pm, Bill Sloman wrote: >>>> >> ... >>>> >>> >>> That circuit is of the category known as "component rich." >> >> What simulation speed do you get? > > That's too repulsive to sumulate. Not a widely shared opinion. > A super-low distortion oscillator would be interesting, but a few > fundamental issues would need to be addressed first. Jim Williams published one years ago - it's covered in one of his Linear Technology application notes. > I'd expect that a 1 PPM THD, variable fequency sine generator > shouldn't be too difficult, but how would you measure it? It isn't. One art per million puts the harmonic content about 120dB below the fundamental, and a few people claim to have done better. Spectrum analysers and Fourier transform analysis can pull out that level of harmonic content - as you really ought to know. -- Bill Sloman, Sydney