Methods for operating radio frequency devices having transmit loopback functionality
First Claim
Patent Images
1. A method of operating a front end module having transmit loopback functionality, the method comprising:
- conducting on a transmit loopback path a loopback signal from an output of a power amplifier to a receive port, the transmit loopback path including a power coupler, an attenuator, and a first switch, the power coupler coupled between the output of the power amplifier and an input of the attenuator, the first switch coupled between an output of the attenuator and the receive port; and
conducting on a receive path a radio frequency receive signal from an antenna port to the receive port, the receive path including a second switch coupled between the antenna port and the receive port, the receive path without the first switch.
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Abstract
A front end module having transmit loopback functionality may be operated by conducting a loopback signal from an output of a power amplifier to a receive port on a transmit loopback path and conducting a radio frequency receive signal from an antenna port to the receive port on a receive path. The transmit loopback path includes a first switch coupled between the output of the power amplifier and the receive port. The receive path includes a second switch coupled between the antenna port, where the receive port and is without the first switch.
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Citations
19 Claims
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1. A method of operating a front end module having transmit loopback functionality, the method comprising:
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conducting on a transmit loopback path a loopback signal from an output of a power amplifier to a receive port, the transmit loopback path including a power coupler, an attenuator, and a first switch, the power coupler coupled between the output of the power amplifier and an input of the attenuator, the first switch coupled between an output of the attenuator and the receive port; and conducting on a receive path a radio frequency receive signal from an antenna port to the receive port, the receive path including a second switch coupled between the antenna port and the receive port, the receive path without the first switch. - View Dependent Claims (2, 3, 4, 5)
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6. A method of operating a front end module having transmit loopback functionality, the method comprising:
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passing a loopback signal in a transmit loopback path to a receive port of the front end module when the front end module is operating in a transmit mode, the transmit loopback path including a power coupler coupled between a power amplifier and an attenuator, and a first switch coupled between the attenuator and the receive port, the first switch configured to interrupt the transmit loopback path when the front end module is operating in a receive mode; and passing a radio frequency receive signal with a second switch in a receive path to the receive port when the front end module is operating the receive mode, the second switch configured to interrupt the receive path when the front end module is operating in the transmit mode, the receive path being free from the first switch. - View Dependent Claims (7, 8)
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9. A method of operating a front end module having transmit loopback functionality, the method comprising:
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closing a first switch in communication with an attenuator and a receive port, tapping with a power coupler in communication with a power amplifier and the attenuator a portion of a signal from an output of the power amplifier, and attenuating with the attenuator the portion in a transmit loopback path, and opening a second switch in a receive path when the front end module is operating a transmit mode, the first switch configured to pass a loopback signal from the output of the power amplifier to the receive port of the front end module and the second switch configured to interrupt the receive path when the front end module is operating in the transmit mode; and opening the first switch in the transmit loopback path and closing the second switch in the receive path when the front end module is operating in a receive mode, the first switch configured to interrupt the transmit loopback path and the second switch configured to pass a receive signal from an antenna port of the front end module to the receive port when the front end module is operating in the receive mode, the receive path independent of the first switch. - View Dependent Claims (10, 11, 12)
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13. A method of operating a wireless device having transmit loopback functionality, the method comprising:
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transmitting and receiving with an antenna radio frequency signals; amplifying with a power amplifier a radio frequency signal for transmission by the antenna; amplifying with a low noise amplifier a radio frequency signal received by the antenna; operating in a transmit mode that includes closing a first switch coupled between an attenuator and a receive port, tapping with a power coupler coupled between the power amplifier and an attenuator a portion of an output signal from the power amplifier, and attenuating with the attenuator the portion in a transmit loopback path of a front end module, and opening a second switch in a receive path of the front end module, the first switch configured to pass a loopback signal from the output of the power amplifier to a receive port of the front end module; and operating in a receive mode that includes opening the first switch in the transmit loopback path and closing the second switch in the receive path, the second switch configured to pass a receive signal from an antenna port of the front end module to the receive port, the receive path independent of the first switch. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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Specification