Two way regulating circuit

A circuit for regulating the voltage at a substrate comprising,

• first and second semiconductor devices each having one end of the respective conduction paths thereof connected to said substrate,
• source means,
• first and second reactive means connected between said source means and the other end of the respective conduction paths of said first and second semiconductor devices and,
• third and fourth semiconductor devices having the conduction paths thereof connected in series between said other ends of said first and second semiconductor devices,
• the control electrodes of said first and fourth semiconductor devices connected together,
• the control electrodes of said second and third semiconductor devices connected together and cross-coupled relative to said first and fourth semiconductor devices.