Path: ...!eternal-september.org!feeder3.eternal-september.org!news.eternal-september.org!eternal-september.org!.POSTED!not-for-mail From: Bill Sloman Newsgroups: sci.electronics.design Subject: Re: 1kHz 130dB distortion sinewave oscillator. Date: Sun, 2 Feb 2025 17:08:22 +1100 Organization: A noiseless patient Spider Lines: 23 Message-ID: References: <0rgtpjlopt521i824vurfan2jkiljk5ph3@4ax.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Injection-Date: Sun, 02 Feb 2025 07:08:26 +0100 (CET) Injection-Info: dont-email.me; posting-host="674590b60f4e3a4f97dea6445781dde9"; logging-data="598182"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX1+MdjJyizROVLt4Ge2zd4J7t8pNfafbvLA=" User-Agent: Mozilla Thunderbird Cancel-Lock: sha1:CZ543dHjlgwcqa7/1a6BT5H3GLg= X-Antivirus-Status: Clean Content-Language: en-US X-Antivirus: Norton (VPS 250202-0, 2/2/2025), Outbound message In-Reply-To: Bytes: 2399 On 2/02/2025 2:12 pm, Edward Rawde wrote: > "JM" wrote in message news:0rgtpjlopt521i824vurfan2jkiljk5ph3@4ax.com... >> >> I you're using polyphase sampling you may as well use a svo. The >> LT115 is not a good choice - it's phase margin is close to zero and it >> is liable to sing at about 25MHz. >> > > Very interesting circuit. Thank you. > > Is there a suitable available alternative to LT1115? > I have seen LT1115 oscillate at 24 MHz in LTSpice 24.1.1 > It doesn't seem to always happen and when it does a little extra load on the output seems to get rid of it. > > 2N4391 doesn't seem to be available at a reasonable price but J113 is. Element 14 says that the J111 is cheap and it has 14000 available globally. It's fairly close to the 2N4319 in terms of gate cut-off voltage - much closer than the J113. -- Bill Sloman, Sydney