Voltage regulator for electronic device
A voltage regulator for an electronic device, the regulator supplying a regulated output voltage from an input voltage, the output voltage being applied to an electronic subsystem of the electronic device adapted to be supplied with power, said regulator comprising a controller receiving the input voltage, a capacitor situated at the output of the regulator and adapted to be charged periodically by the input voltage and periodically to supply its charge to the electronic subsystem of the electronic device when said electronic subsystem requires to be supplied with power, the capacitor being connected in parallel with a feedback network for sampling a portion of the output voltage and supplying a measured value of the output voltage to the controller, the feedback network comprising at least two transistors, a voltage comparator, and a switch situated between the output of the comparator and the input of the controller, which voltage regulator is characterized in that a switch is inserted into the feedback network between the input of the feedback network and the first transistor, the switch being open when the electronic subsystem requires no power.
1 . A voltage regulator for an electronic device, the regulator supplying a regulated output voltage (Vout) from an input voltage (Vin), the output voltage (Vout) being applied to an electronic subsystem of the electronic device adapted to be supplied with power, said regulator comprising a controller (CONTR) receiving the input voltage (Vin), a capacitor ( 10 ) situated at the output of the regulator and adapted to be charged periodically by the input voltage (Vin) and periodically to supply its charge to the electronic subsystem of the electronic device when said electronic subsystem requires to be supplied with power, the capacitor ( 10 ) being connected in parallel with a feedback network for sampling a portion of the output voltage (Vout) and supplying a measured value of the output voltage (Vout) to the controller (CONTR), the feedback network comprising at least two transistors ( 20 , 30 ), a voltage comparator (COMP), and a switch ( 40 ) situated between the output of the comparator (COMP) and the input of the controller (CONTR), which voltage regulator is characterized in that a switch ( 50 ) is inserted into the feedback network between the input of the feedback network and the first transistor ( 20 ), the switch ( 50 ) being open when the electronic subsystem requires no power.
2 . A voltage regulator according to claim 1 , characterized in that the voltage comparator (COMP) compares the sampled portion of the output voltage to a reference voltage (Vref) characteristic of the electronic subsystem adapted to be supplied with power.
3 . A voltage regulator according to claim 1 , characterized in that the comparator (COMP) is a regulation control transistor adapted to supply the exact voltage required by the electronic subsystem to function in an optimum manner.
4 . A voltage regulator according to Claim 1 , characterized in that the electronic device is a radio terminal.