Power level indicator

摘要

An electronic device is provided that is adapted to generate a supply voltage at an input node from a radio frequency (RF) signal. The electronic device includes a limiter coupled to the input node for limiting a supply voltage level at the input node that is generated by the received RF signal. The limiter is configured to draw a limiter current from the input node so as to limit the supply voltage level to a maximum and a magnitude of the limiter current is used for controlling a power consumption of the electronic device.

主权项

1. An electronic device adapted to generate a supply voltage at an input node from a radio frequency (RF) signal, the electronic device comprising a voltage limiter coupled to the input node for limiting a supply voltage level at the input node that is generated by the received RF signal, wherein the limiter is configured to draw a limiter current from the input node so as to limit the supply voltage level to a maximum and a magnitude of the limiter current is used for controlling a power consumption of the electronic device, wherein the limiter comprises a first transistor coupled with a channel to the input node and the first transistor is controlled to draw the limiter current from the input node and a second transistor coupled to the first transistor in a current mirror configuration for mirroring the limiter current, further comprising a voltage regulator having a third transistor for regulating voltage to the electronic device and a fourth transistor in series with the second transistor coupled to an input for the voltage regulator and having a control electrode coupled to the control electrode of the third transistor, a voltage at a node between the second and fourth transistors being used to control power consumption of the electronic device.