Class D/E RF MOSFET driver chip generates nsec rise-time pulses

June 24, 2013 // By Graham Prophet
Distributor RFMW now supports the IXYS RF model IXRFD631, a high-current CMOS gate driver specifically designed to drive MOSFETs in Class D and E HF RF applications as well as other applications requiring ultra-fast rise and fall times or short minimum pulse widths.

The IXYS RF IXRFD631 employs a Kelvin ground connection on the input allowing the use of a common mode choke to avoid ground bounce problems. Capable of sinking 30A of peak current, the IXRFD631 can produce voltage rise and fall times of less than 4 nsec and minimum pulse widths of 8 nsec. The driver input is compatible with TTL or CMOS and is fully immune to latch up over the entire operating range. Designed with small internal delays, cross conduction or current shoot-through is virtually eliminated. Low quiescent current and a wide operating voltage range make the device suitable for applications such as pulse generators, pulse laser diode drivers and switch mode supplies where the low inductance RF package minimises stray lead inductances for optimum switching performance.