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mallets

134 声望加入于 8年前

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mallets
·18小时前·讨论
AD936x系列的I/Q校准令人印象深刻。我想现在也是如此,因为即使在十年后的今天,也没有令人信服的替代品。

由于我主要处理单通道应用,因此我可以使用双超频器,避免运行时校准。在这里没有选择,Zero-IF 在多通道方面有太多的优点。
mallets
·19小时前·讨论
是的,在低频中频情况下,抖动并不太重要。I/Q 校正更有可能成为瓶颈。还有小数 PLL 产生的近距离脉冲。

我在多输入多输出(MIMO)/相控阵方面经验很少,这种应用可能不需要超高 SFDR。
mallets
·20小时前·讨论
真正吸引人的部分是这里的 "定制 ADC",似乎是某种 1 位 ΣΔ 超采样 ADC(704 MSPS?)单差分晶体管,由 FPGA 的 LVDS RX 捕捉。

降低成本和引脚数的好方法?但我认为典型的 FPGA 时钟树抖动性能较差。不使用内部 PLL(s)可能会有助于解决尖峰问题,但时钟缓冲器是不可避免的。

文档中提到,开关稳压器产生的噪声可能会进一步降低抖动性能。哦,寻找射频噪声源的乐趣。
mallets
·2个月前·讨论
Only if the difference in signal power is high (>40 dB). It’s like saying collisions aren’t a problem in situations where no collision actually occurs.
mallets
·6个月前·讨论
Wish the proponents of stricter immigration would push for a proper national ID first.

Right now you have all the cons anyway, with none of the pros. A stitched-up database that has no laws attached to prevent its misuse. Just like with gun control, law enforcement could've made their job easier decades ago.
mallets
·6个月前·讨论
For the established players, it's the battery supply chain that's the main issue. Rest can be locally-sourced or manufactured. Makes them very nervous, having to import when tariffs and rules change everyday.

My city in South India could be an outlier but I see green EV number plates everywhere. Would love to see a state-wise breakdown for sale share.
mallets
·6个月前·讨论
The explanation is that the trusted brands (in 2Ws) are just now rolling-out EVs, the market is very conservative and home charging likely isn't an option if one's renting.

The cheaper variants now have enough range to relieve (urban) range anxiety, wasn't the case a year or two ago. My own model that's 4 years old, the new variant now has 2.5x range, faster charging and much better features. All that for the same price, and without any of the subsidies that used to exist.

These things take time, this is a low-margin business that isn't drowning in VC money.
mallets
·6个月前·讨论
It's the opposite IME, most petrol two-wheelers are massive money sinks past 5 years of ownership. You will likely spend close to original price in maintenance and repairs, with most models developing "unfixable" issues that massively degrade the experience. It doesn't need to be engine related for the costs to add up.

Even if the battery craps out after 5 years (extremely unlikely), it's a wash. That's before considering the fuel savings. Battery degradation is a bit of a meme, we aren't even 10 years into mass adoption of EVs for this to be a common experience.
mallets
·7个月前·讨论
Leasing land for solar pays very little. The only reason people do it is because the land has no better use and solar doesn’t permanently damage it the way mining or farming could. Other industries aren’t being priced out.
mallets
·8个月前·讨论
Talking more about some unrelated function taking down the whole system, not advocating for "offline" credit card transactions (is this even a thing these days?). Ex: If the transaction needs to be logged somewhere, it can be built to sync whenever possible rather than blocking all transactions if the central service is down.

Payment processor being down is payment processor being down.
mallets
·8个月前·讨论
Those are examples where they shouldn't be using public cloud in the first place. Should build those services to be local-first.

Using a different, smaller cloud provider doesn't improve reliability (likely makes it worse) if the architecture itself wrong.
mallets
·8个月前·讨论
It's "legal" at first glance but it's effectively banned in most cases. No monetary compensation, only direct relatives, only traditional pregnancy, etc.

It's outright banned (commercial) in most of EU. In most countries it was left unregulated for a long time but most of them are choosing to ban all commercial forms of it. Besides US, most major countries have banned it.

Now many people do ignore these laws and most governments do little to enforce them unless they make the news for some reason. Banning commercial forms of it just ensures abuse and issues go unreported. It's the paternalistic part of feminism that's been leading the charge for modern bans, with both liberal and conservative roots.
mallets
·8个月前·讨论
Being gay isn't the choice here, choosing not to act on your attraction/desires is. Might feel nitpicky but a very important distinction.
mallets
·8个月前·讨论
Having kids is half the reason (or more) for such marriages, nothing completes the nuclear family picture quite like it. And not like it's easy for gay couples in accepting environments to have kids either, surrogacy is banned in most countries ("liberal" ones too, US is kind of an exception here) and adoption is nigh impossible. Some countries like Italy go as far as selectively making both illegal, but only for gay couples.

I would say many asian parents care very little about the partner, as long as they get their grandkids. A mix of that and "what would society think".
mallets
·8个月前·讨论
I'm guessing India, and it's dowry part of it that complicates things a lot. And once either party goes into legal proceedings, it becomes a shit slinging mess of he-said she-said. Hence why most people try to "settle" things out of the court even if they were the victim. You wouldn't wish the Indian legal system on your worst enemy.
mallets
·8个月前·讨论
Grace and Frankie (tv show) deals with some of this, don't think I'm the target audience but I enjoyed it as 20-30 year old.
mallets
·8个月前·讨论
Yup. All the inconvenience of unmanaged, just to get worse uptime and performance? Who wouldn't want that.
mallets
·8个月前·讨论
The "omg centralized infra" cries after every such event kind of misses the point. Hosting with smaller companies (shared, vps, dedi, colo whatever) will likely result in far worse downtimes, individually.

Ofc the bigger perception issue here is many services going out at the same time, but why would (most) providers care if their annual downtime does or doesn't coincide with others? Their overall reliability is no better or worse had only their service gone down.

All of this can change ofc if this becomes a regular thing, the absolute hours of downtime does matter.
mallets
·8个月前·讨论
People who don't need that, also don't care much for an hour or two of service disruption. Most users will have far worse disruptions with the alternatives.
mallets
·8个月前·讨论
Might be the first time I have ever seen that. Though in my case the "Host" is Cloudflare's own Pages service.