kellbengal
New Member
Hi - first time posting to the forum, so please be gentle.
I'm trying to build a very compact circuit to drive a 10 nH coil via an H-bridge at 3 MHz. A very similar application requires the same thing at 10 MHz. Each circuit (including fets and a tiny PIC) has to fit into a 40x20 mm area (not counting the coil).
My first thought was to start with a 20-40 MHz oscillator, put it through a counter and then use some gates with an RC circuit to put in a deadzone where all the FETs would be off (to avoid large cross-over currents). However, this has turned out to be too bulky.
I think what I really need is a motor-drive IC, but I've not seen any that can handle anywhere close to 3 MHz, let alone 10 MHz.
Does anyone know of a suitable part, or have any suggestions? I'm just about ready to consider putting in a signal micro to drive the bloody FETs directly. Any thoughts?
Edit: I only need 3.3 v across the coil, so the FETs don't have to be fancy. There are no huge currents involved.
-Kell
I'm trying to build a very compact circuit to drive a 10 nH coil via an H-bridge at 3 MHz. A very similar application requires the same thing at 10 MHz. Each circuit (including fets and a tiny PIC) has to fit into a 40x20 mm area (not counting the coil).
My first thought was to start with a 20-40 MHz oscillator, put it through a counter and then use some gates with an RC circuit to put in a deadzone where all the FETs would be off (to avoid large cross-over currents). However, this has turned out to be too bulky.
I think what I really need is a motor-drive IC, but I've not seen any that can handle anywhere close to 3 MHz, let alone 10 MHz.
Does anyone know of a suitable part, or have any suggestions? I'm just about ready to consider putting in a signal micro to drive the bloody FETs directly. Any thoughts?
Edit: I only need 3.3 v across the coil, so the FETs don't have to be fancy. There are no huge currents involved.
-Kell
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