**TL;DR: With two nMOSFETs in series, why does the load experience current spikes during switching times of one transistor even when the other is off - and how can I avoid it?**

Consider the following circuit, simulated in LTspice:

[![IR emitter driver circuit][1]][1]

Use case: It's a boiled-down version of an IR emitter driver I'm trying to design, which modulates a lower-frequency pulse train `B` on top of a higher-frequency carrier signal `A`, as in the [Philips RC-6 remote control protocol](https://www.sbprojects.net/knowledge/ir/rc6.php). For the purposes of this question, unimportant details like the LED itself, gate pull-downs, etc. have been removed.

When I simulate the circuit and check the load current across R3, I see this:

[![LTspice simulation][2]][2]

When Q1 is off, the load still sees some current spikes (upper yellow circle) when Q2 switches - up to 3 mA, which is plenty to get some unintended light out of an LED. I understand that due to gate capacitance, there can be high current when switching the transistor (lower yellow circle). And I know I can limit this current by increasing the value of R1 and R2.

But what I don't understand is why these current spikes are transferred (directly or indirectly) to the load. **Why is this?**

If I increase R1 and R2 to 10k, both the gate drive current and the spikes seen by the load are drastically reduced:

[![LTspice simulation 2][3]][3]

But consequently the switching is much slower, and the edges aren't as crisp. R3 also still sees current spikes up to 160 uA - much better, but not perfect.

**Is there another way to modify the circuit**, without limiting gate current, so that the load does not see current spikes during switching times of one transistor when the other is off?

_To clarify: For this particular application, I'm sure increasing R1 and R2 is a workable solution, and at these frequencies, BJTs might be a better choice anyway. But this is a learning experience for me, and I'd like to understand this behavior. **Thanks in advance!**_

  [1]: https://i.sstatic.net/Od3BI.png
  [2]: https://i.sstatic.net/RpyVC.png
  [3]: https://i.sstatic.net/A9CTr.png