Disclosed is a solid state flow generator of a respiratory apparatus for generating a controlled supply of breathable gas. The flow generator includes a set of ionizers (101-FG) configured to propel a flow of breathable gas and a controller (888) coupled with the set of ionizers (101-FG). The set of ionizers (101-FG) are configured with a flow path adapted to couple with a user respiratory interface (108). The controller (888) is configured to selectively activate the ionizers (101-FG) for propelling the flow of breathable gas.