Current limiting circuit

A method for limiting the in-rush current of a radio device coupled to a low-power external power source, comprising steps of:

• inserting a switch circuit in series between said power source and said radio device, said switch having an “off” state with a high impedance and an “on” state with a low impedance;
• and
• coupling a time-delay shorting circuit to said switch circuit, said time-delay shorting circuit having a time constant;
• switching to said high impedance “off” state for limiting said in-rush current to said radio device before said time constant has elapsed;
• and
• switching to said low impedance “on” state after said time constant has elapsed so that said radio device is powered by said external power source.

A radio device provided in a compact flash form factor, said radio device being powered by a low-power external power source, comprising:

• radio electronics having an in-rush current demand;
• a switch circuit in series between said power source and said radio device, said switch circuit having an “off” state with a high impedance and an “on” state with a low impedance;
• and
• a time-delay shorting circuit coupled to said switch circuit, said time-delay shorting circuit having a time constant;
• wherein before said time constant has elapsed, said switch circuit is in said high impedance “off” state for limiting said in-rush current to said radio device and wherein after said time constant has elapsed, said switch circuit is in said low impedance “on” state so that said radio device is powered by said external power source.

A method for limiting the in-rush current of a radio device coupled to a low-power external power source, comprising the steps of:

• initially charging the radio device with a power source in a low power state;
• sensing a voltage across a component associated with said radio device;
• and
• switching from said low power state to a full power state when said voltage exceeds a threshold level.