Radio frequency front end module with high band selectivity
First Claim
1. A radio frequency front end module for transmitting and receiving radio frequency signals, the front end module comprising:
- a plurality of external filters, wherein the plurality of external filters include different pass bands;
a control lead configured to supply a control signal to dynamically couple an external filter of the plurality of external filters to an integrated circuit during operation of the front end module;
the front end module configured to dynamically adjust characteristics of the external filter to process signals from a different frequency band; and
the integrated circuit coupled with the external filter via two external filter leads, the integrated circuit including;
a transmit-receive switch having a transmit port, a receive port and an antenna port, the transmit-receive switch during operation alternates between coupling the antenna port to the transmit port and coupling the antenna port to the receive port;
a power amplifier configured to amplify a modulated radio frequency signal, the transmit-receive switch outputs the amplified modulated radio frequency signal when the antenna port is coupled to the transmit port;
a low pass filter coupled between the power amplifier and the transmit port of the transmit-receive switch, the low pass filter configured to pass low-frequency signals and attenuate signals with frequencies higher than a cutoff frequency;
a low noise amplifier configured to amplify a received radio frequency signal when the antenna port is coupled to the receive port; and
the two external filter leads coupling the external filter between the low noise amplifier of the integrated circuit and the receive port of the transmit-receive switch of the integrated circuit.
1 Assignment
0 Petitions
Accused Products
Abstract
A radio frequency front end module is provided for a high power capability and a high signal band selectivity. The front end module includes an external filter and an integrated circuit coupled with the external filter via two external filter leads. The integrated circuit includes a transmit-receive switch, a power amplifier and a low noise amplifier. The transmit-receive switch alternates between coupling an antenna port to a transmit port and coupling the antenna port to a receive port. The power amplifier amplifies a modulated radio frequency signal. The low noise amplifier amplifies a received radio frequency signal when the antenna port is coupled to the receive port. The external filter can be replaced to adapt to various requirements of signal frequency bands, without the need of modifying the layout of the integrated circuit.
-
Citations
16 Claims
-
1. A radio frequency front end module for transmitting and receiving radio frequency signals, the front end module comprising:
-
a plurality of external filters, wherein the plurality of external filters include different pass bands; a control lead configured to supply a control signal to dynamically couple an external filter of the plurality of external filters to an integrated circuit during operation of the front end module; the front end module configured to dynamically adjust characteristics of the external filter to process signals from a different frequency band; and the integrated circuit coupled with the external filter via two external filter leads, the integrated circuit including; a transmit-receive switch having a transmit port, a receive port and an antenna port, the transmit-receive switch during operation alternates between coupling the antenna port to the transmit port and coupling the antenna port to the receive port; a power amplifier configured to amplify a modulated radio frequency signal, the transmit-receive switch outputs the amplified modulated radio frequency signal when the antenna port is coupled to the transmit port; a low pass filter coupled between the power amplifier and the transmit port of the transmit-receive switch, the low pass filter configured to pass low-frequency signals and attenuate signals with frequencies higher than a cutoff frequency; a low noise amplifier configured to amplify a received radio frequency signal when the antenna port is coupled to the receive port; and the two external filter leads coupling the external filter between the low noise amplifier of the integrated circuit and the receive port of the transmit-receive switch of the integrated circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
-
-
13. A method for transmitting and receiving radio frequency signals, the method comprising:
-
receiving an input radio frequency signal at an antenna; supplying a control signal to dynamically couple a band pass filter of a plurality of external filters to an integrated circuit during operation of the front end module, wherein the plurality of external filters include different pass bands; dynamically adjusting characteristics of the band pass filter external to the integrated circuit to process signals from a different frequency band; when a transmit-receive switch within the integrated circuit is switched to a receive side, transmitting the input radio frequency signal to the band pass filter external to the integrated circuit for attenuating signals outside of a pass band of the band pass filter; amplifying the input radio frequency signal at a low noise amplifier within the integrated circuit; amplifying an output radio frequency signal at a power amplifier within the integrated circuit; attenuating, by a low pass filter within the integrated circuit, signals of the output radio frequency signal that have frequencies higher than a cutoff frequency of the low pass filter; when the transmit-receive switch within the integrated circuit is switched to a transmit side, transmitting the output radio frequency signal to the antenna via the transmit-receive switch; and transmitting the output radio frequency signal at the antenna. - View Dependent Claims (14, 15, 16)
-
Specification