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Power MOSFETs for RF, broadband apps

Posted: 17 Sep 2013     Print Version  Bookmark and Share

Keywords:Microsemi  power MOSFET  VRF2944  VRF3933  broadband communication 

Microsemi Corp. has extended its high-frequency vertical diffusion metal oxide semiconductor (VDMOS) MOSFET product portfolio with the introduction of two higher power, higher voltage VRF2944 and VRF3933. According to the company, the devices are intended for the industrial, scientific and medical (ISM) frequency range of 2-60MHz. Targeted applications include commercial and defence RF power and broadband communications requiring high power and gain without compromising reliability, ruggedness or inter-modulation distortion, added the firm.

The VRF2944 offers 400W or 33 per cent higher output power at 50V supply voltages than competitive devices, including the SD2933. Microsemi's higher power device allows customers to increase the power of existing systems by this same 33 per cent or decrease the dollar per watt for their RF power systems, stated the company. In addition, the gate resistor is integrated on the MOSFET that improves parasitic impedance to maintain the maximum operating frequency at 60MHz. The VRF2944, like Microsemi's previous generation product, the VRF2933, is capable of operating up to 65V supply voltages where a single VRF2944 can deliver 675W of output power.

The VRF3933 is capable of operating up to 100V supply voltages and delivering 300W of output power. The higher voltage MOSFET also gives a higher output impedance, which is easier to match to 50Ω load. For example, four VRF3933 devices with two in parallel, and those two parallel pairs in push-pull, are capable of launching 1.1kW with 83V supply voltage through a 4:1 transformer to a 50Ω load.

Samples of the VRF2944 and VRF3933 are in stock.

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