Figure 1 made me laugh out loud.
Same here. That's made my week.
Extreme 220GHz+Broadband Silicon Capacitor X2SC 0201M 22nF BV11
11–20 of 34 posts
Re: Extreme 220GHz+Broadband Silicon Capacitor X2SC 0201M 22nF BV11
#12https://www.digikey.ie/en/products/detail/murata-electronics... A mere 2.40 euros each!
All silicon capacitors are relatively expensive, they're specialty parts that generally go into expensive things (mmWave airport scanners, optical backhaul, etc).
Did they build 5,000 airport scanners at once? MOQ is brutal!
Re: Extreme 220GHz+Broadband Silicon Capacitor X2SC 0201M 22nF BV11
#13Re: Extreme 220GHz+Broadband Silicon Capacitor X2SC 0201M 22nF BV11
#14Figure 1 made me laugh out loud.
It may seem overly simplistic, but 2-port models for capacitors can be configured in series (as shown here) or in shunt (much more common for power distribution network applications). So, as basic as you might think this diagram is, it is entirely expected to be there so that we instantly know if the S-parameters are in series or shunt configuration - it would be more unusual if it were missing.
Re: Extreme 220GHz+Broadband Silicon Capacitor X2SC 0201M 22nF BV11
#15Why is this a component? Couldn't you just make one of these out of PCB traces?
Certainly not at these frequencies and corresponding high capacitance values; getting 22nF out of a PCB even with ECM would require quite a large surface area and at 220GHz you can't have that since your wavelength is so short; you'd just be making a giant resonator instead.
ECM = Embedded Capacitance Material.
It is a special PCB laminate designed to create capacitance inside the PCB stack-up, typically between closely spaced power and ground planes.
Re: Extreme 220GHz+Broadband Silicon Capacitor X2SC 0201M 22nF BV11
#16Earlier quoted context omitted.
All silicon capacitors are relatively expensive, they're specialty parts that generally go into expensive things (mmWave airport scanners, optical backhaul, etc).
Did they build 5,000 airport scanners at once? MOQ is brutal!
One scanner has way more than one channel…
Re: Extreme 220GHz+Broadband Silicon Capacitor X2SC 0201M 22nF BV11
#17Why is this a component? Couldn't you just make one of these out of PCB traces?
Certainly not at these frequencies and corresponding high capacitance values; getting 22nF out of a PCB even with ECM would require quite a large surface area and at 220GHz you can't have that since your wavelength is so short; you'd just be making a giant resonator instead.
Length of this capacitor is close to half-wavelength of 220 GHz (in vacuum).
Using siblings of this broadband capacitor (40 GHz, same package) in some designs. In assembly, those require decent process control. This 0201M package is closer to 01005 passives in pad size. Typically no solder paste is used, just flux. Solder mask alignment has to be very tight (thin web used as a dam only).
Cost per cap is reasonable where it is actually needed, other parts of the system are often orders of magnitude more expensive at those frequencies where performance matters. Where it gets the very high performance, is pillars/channels etched into silicon quite similar to how DRAM capacitors are made, just a “little bit bigger”. This allows for very low inductance and thus very high resonant frequency.
Re: Extreme 220GHz+Broadband Silicon Capacitor X2SC 0201M 22nF BV11
#18Someone's actually using nF, instead of 0.022uF or 22,000pF.
I never understood why nF is less frequently used than uF or pF. To me, the logical thing is to express the capacity in units that are between 1 and 1000, like it's done with resistors and inductors.
I, too, had wondered; this seems particularly common in the US. My best theory is that in rough handwriting, n and u/μ can look pretty similar, and everyone sort of agreed to only use u to reduce ambiguity.
Re: Extreme 220GHz+Broadband Silicon Capacitor X2SC 0201M 22nF BV11
#19Earlier quoted context omitted.
I never understood why nF is less frequently used than uF or pF. To me, the logical thing is to express the capacity in units that are between 1 and 1000, like it's done with resistors and inductors.
I, too, had wondered; this seems particularly common in the US. My best theory is that in rough handwriting, n and u/μ can look pretty similar, and everyone sort of agreed to only use u to reduce ambiguity.
I heard this, and have witnessed it. One of my first jobs included board rework. There were several times when I had to go ask if they wrote a uF or an nF. The response was always "obviously a uF", because nobody uses nF!
Re: Extreme 220GHz+Broadband Silicon Capacitor X2SC 0201M 22nF BV11
#20Figure 1 made me laugh out loud.
It may seem overly simplistic, but 2-port models for capacitors can be configured in series (as shown here) or in shunt (much more common for power distribution network applications). So, as basic as you might think this diagram is, it is entirely expected to be there so that we instantly know if the S-parameters are in series or shunt configuration - it would be more unusual if it were missing.
I think you're thinking of the other figure. Figure 1 has no connections at all