The microwave generator uses GaN on SiC solid-state technology operating in class A/B mode to generate microwave power in excess of 100W CW using an internally regulated microwave source - see Fig.1.
The output power can be varied in 5W increments from 0-100W using pulse width modulation (PWM) techniques with power stability maintained well within 5% of the set value.
The MSYS245 has, as standard, an innovative reflected power measurement mode of operation.
When used in the [swept] mode, the system has the capability to reduce the reflection measurement error significantly for applicators with a return loss of less than 12dB to ensure that the accurate measurement of reflection is relayed to the user. This measurement technique also allows the medical system to be less affected by manufacturing tolerances in the applicators and tethered RF cables.
This mode of operation is particularly useful for applications that are dependent on the accuracy of reflected signal to identify tissue property changes or relaying treatment progress and safety to the user.
To find out more about common safety issues and how we solve them, download our discussion paper on reflective power measurement.
To find out more about common measurement problems and how we solve them, download our discussion paper on reflective power.
The use of higher operating voltages on the GaN on SiC semiconductors in the MSYS245 system design helps reduce the drain current and the resultant Joule effect losses.
The system has an amplifier efficiency of ~62% resulting in a low channel temperature rise and also significantly reduced thermal loss requiring reduced thermal management – see Fig 2. The MSYS245’s highly efficient design has allowed the implementation of a novel, thermal cooler solution to dissipate heat losses and maintaining the amplifier temperature when operating at full power at below 55 degrees Celsius.
The cooling system employed is very compact with superior thermal capacity per unit volume allowing the overall system to be significantly smaller and lighter with an optimised air-flow management system.
The system is supplied, as standard, with a regional specific mains lead and medical grade footswitch.