Radio frequency device and voltage generating circuit thereof

A radio frequency device, comprising:

• a voltage generating circuit adapted to receive a radio frequency signal, wherein the voltage generating circuit, by using the radio frequency signal, generates at least one bias voltage related to the radio frequency signal;
• and
• a radio frequency circuit adapted to receive the radio frequency signal and coupled to the voltage generating circuit to receive the at least one bias voltage, wherein the radio frequency circuit comprises at least one radio frequency transmission path, and the at least one bias voltage is adapted to operate a conduction state of the at least one radio frequency transmission path,
• wherein the radio frequency circuit comprises:
• a radio frequency transmission circuit adapted to receive the radio frequency signal and determining whether to transmit the radio frequency signal via the at least one radio frequency transmission path;
• and
• a logic circuit coupled to the voltage generating circuit to receive the at least one bias voltage, wherein the logic circuit controls the conduction state of the at least one radio frequency transmission path in the radio frequency transmission circuit according to at least one control signal.

A voltage generating circuit, comprising:

• a rectification circuit having an input terminal adapted to receive a radio frequency signal, wherein the rectification circuit generates at least one auxiliary voltage related to the radio frequency signal;
• and
• a voltage adjustment circuit having at least one output terminal adapted to generate at least one bias voltage related to the radio frequency signal and provide the at least one bias voltage to a radio frequency circuit, wherein the at least one bias voltage is adapted to operate a conduction state of at least one radio frequency transmission path of the radio frequency circuit,
• wherein the voltage adjustment circuit coupled to the rectification circuit to receive the at least one auxiliary voltage, and generating a first bias voltage or a second bias voltage of the at least one bias voltage to provide the first bias voltage or the second bias voltage to the radio frequency circuit, wherein the first bias voltage and the second bias voltage are related to the at least one auxiliary voltage;
• and
• wherein the at least one auxiliary voltage comprises an upper half-wave auxiliary voltage related to an upper half-wave part of the radio frequency signal, or a lower half-wave auxiliary voltage related to a lower half-wave part of the radio frequency signal.