Radio frequency module having an isolation mode between transmission mode and power saving mode

A radio frequency module comprising:

• a power amplifier circuit for amplifying a transmission radio frequency signal and outputting an amplified signal to a transmission node;
• a first transistor for coupling the transmission node to an antenna;
• a second transistor for shunting the transmission node to a first power supply voltage;
• a first power supply voltage generation circuit for generating a second power supply voltage higher than the first power supply voltage;
• a second power supply voltage generation circuit for generating a third power supply voltage lower than the first power supply voltage;
• a level shift circuit unit to which the second and third power supply voltages are supplied and which performs on-off control of the first and second transistors by applying a control signal having a value of the second power supply voltage or the third power supply voltage to the first and second transistors;
• and
• a control circuit which switches a plurality of operation modes including a transmission operation mode, an isolation operation mode, and a power saving operation mode in accordance with an inputted first instruction and controls the level shift circuit unit and activation and deactivation of the first and second power supply voltage generation circuits in accordance with each operation mode,
• wherein in the transmission operation mode, the control circuit activates the first and second power supply voltage generation circuits and the control circuit turns on the first transistor and turns off the second transistor through the level shift circuit unit,
• wherein in the isolation operation mode, the control circuit activates the first and second power supply voltage generation circuits and the control circuit turns off the first transistor and turns on the second transistor through the level shift circuit unit,
• wherein in the power saving operation mode, the control circuit deactivates the first and second power supply voltage generation circuits, and
• wherein when transition from the transmission operation mode to the power saving operation mode is instructed by the first instruction, the control circuit performs the isolation operation mode during a first time period after the transmission operation mode and then transitions to the power saving operation mode.

A radio frequency module comprising:

• a wiring board;
• a first semiconductor chip which is mounted over the wiring board;
• and
• a second semiconductor chip which is mounted over the wiring board and formed of an SOI substrate,
• wherein the first semiconductor chip includes:
• a bias circuit for generating a bias;
• a power amplifier circuit for amplifying an inputted transmission radio frequency signal with a gain corresponding to the bias and outputting an amplified signal to a transmission node;
• a first power supply voltage generation circuit for generating a positive power supply voltage;
• and
• a control circuit which switches a plurality of operation modes including a transmission operation mode, an isolation operation mode, and a power saving operation mode in accordance with an inputted first instruction, outputs a first control signal corresponding to each operation mode, and controls activation and deactivation of the first power supply voltage generation circuit,
• wherein the second semiconductor chip includes:
• a first transistor for coupling the transmission node to an antenna;
• a second transistor for shunting the transmission node to a ground voltage;
• a third transistor for sending a reception radio frequency signal received by the antenna to a reception node;
• a fourth transistor for shunting the reception node to the ground voltage;
• a second power supply voltage generation circuit for generating a negative power supply voltage, using the positive power supply voltage;
• and
• a level shift circuit unit to which the positive power supply voltage and the negative power supply voltage are supplied and which performs on-off control of the first to fourth transistors by applying a second control signal having a value of the positive power supply voltage or the negative power supply voltage to the first to fourth transistors in accordance with the first control signal,
• wherein in the transmission operation mode, the control circuit activates the first power supply voltage generation circuit and outputs the first control signal having first logic information,
• wherein in the isolation operation mode, the control circuit activates the first power supply voltage generation circuit and outputs the first control signal having second logic information,
• wherein in the power saving operation mode, the control circuit deactivates the first power supply voltage generation circuit and outputs the first control signal having third logic information,
• wherein the level shift circuit unit turns on the first and fourth transistors and turns off the second and third transistors in accordance with the first logic information,
• wherein the level shift circuit unit turns off the first and third transistors and turns on the second and fourth transistors in accordance with the second logic information, and
• wherein when transition from the transmission operation mode to the power saving operation mode is instructed by the first instruction, the control circuit performs the isolation operation mode during a first time period after the transmission operation mode and then transitions to the power saving operation mode.

A radio frequency module configured enter a power saving operation mode from a transmission operation mode via an isolation operation mode in response to a first instruction, the radio frequency module comprising:

• a transmission node;
• a first transistor for coupling the transmission node to an antenna;
• a second transistor for shunting the transmission node to a first power supply voltage;
• and
• circuitry configured to:
• when in the transmission operation mode, provide a second power supply voltage and a third power supply voltage and apply a control signal corresponding to the second power supply voltage or the third power supply voltage to each of the first and second transistors so as to turn on the first transistor and turn off the second transistor;
• in response to a first instruction to enter the power saving mode from the transmission operation mode, turn off the first transistor and turn on the second transistor for a first predetermined period of time during an isolation operation mode;
• and
• after the first predetermined period of time, discontinue providing the second and third power supply voltages.