Increased receive sensitivity radio frequency front end integrated circuits
First Claim
1. A front end circuit for coupling an antenna to a first radio frequency (RF) transceiver, the RF transceiver being defined by an operating frequency band and including a signal input and a signal output, the front end circuit comprising:
- an antenna port connectible to the antenna;
a transmit port connectible to the signal output of the RF transceiver;
a receive port connectible to the signal input of the RF transceiver;
a power amplifier including an input and an output, the input being coupled to the transmit port;
a low noise amplifier including an input and an output, the output being coupled to the receive port; and
a switching network interconnecting the output of the power amplifier, the input of the low noise amplifier, and the antenna port, the switching network including;
a first resonant circuit with a first switching transistor defining a first parallel resonance with a first resonant resistance in the operating frequency band upon activation of the first switching transistor, and a substantially high transistor impedance upon deactivation of the first switching transistor, the first resonant circuit including a series resonance segment having a low impedance in the operating frequency band;
a second resonant circuit with a second switching transistor defining a second parallel resonance with a second resonance resistance in the operating frequency band upon activation of the second switching transistor, and a substantially high transistor impedance upon deactivation of the second switching transistor; and
a third resonant circuit with a third switching transistor defining a third parallel resonance with a third resonance resistance in the operating frequency band upon activation of the third switching transistor, and a substantially high transistor impedance upon deactivation of the third switching transistor.
7 Assignments
0 Petitions
Accused Products
Abstract
A front end circuit for coupling an antenna to a radio frequency (RF) transceiver is disclosed. An antenna port connectible to the antenna is provided, as well as a power amplifier coupled to a signal output of the RF transceiver and a low noise amplifier coupled to the signal input of the RF transceiver. The front end circuit includes a switching network that is connected to the antenna port, the power amplifier, and the low noise amplifier. Additionally, there is at least one resonant circuit and a control circuit coupled to a receive enable line of the transceiver. This resonant circuit defines a parallel resonance with a first resonant resistance in the operating frequency band upon activation in the receive mode. The resonant circuit also defines a substantially high transistor impedance upon deactivation in the transmit mode.
-
Citations
18 Claims
-
1. A front end circuit for coupling an antenna to a first radio frequency (RF) transceiver, the RF transceiver being defined by an operating frequency band and including a signal input and a signal output, the front end circuit comprising:
-
an antenna port connectible to the antenna; a transmit port connectible to the signal output of the RF transceiver; a receive port connectible to the signal input of the RF transceiver; a power amplifier including an input and an output, the input being coupled to the transmit port; a low noise amplifier including an input and an output, the output being coupled to the receive port; and a switching network interconnecting the output of the power amplifier, the input of the low noise amplifier, and the antenna port, the switching network including; a first resonant circuit with a first switching transistor defining a first parallel resonance with a first resonant resistance in the operating frequency band upon activation of the first switching transistor, and a substantially high transistor impedance upon deactivation of the first switching transistor, the first resonant circuit including a series resonance segment having a low impedance in the operating frequency band; a second resonant circuit with a second switching transistor defining a second parallel resonance with a second resonance resistance in the operating frequency band upon activation of the second switching transistor, and a substantially high transistor impedance upon deactivation of the second switching transistor; and a third resonant circuit with a third switching transistor defining a third parallel resonance with a third resonance resistance in the operating frequency band upon activation of the third switching transistor, and a substantially high transistor impedance upon deactivation of the third switching transistor. - View Dependent Claims (2, 3, 4, 5, 6)
-
-
7. A front end circuit for coupling an antenna to a radio frequency (RF) transceiver, the RF transceiver being defined by an operating frequency band and including a signal input and a signal output, the front end circuit comprising:
-
an antenna port connectible to the antenna; a transmit port connectible to the signal output of the RF transceiver; a receive port connectible to the signal input of the RF transceiver; a power amplifier including an input and an output, the input being coupled to the transmit port; a low noise amplifier including an input and an output, the output being coupled to the receive port; and a switching network interconnecting the output of the power amplifier, the input of the low noise amplifier, and the antenna port, the switching network including a first resonant circuit with a first switching transistor defining a first parallel resonance with a first resonant resistance in the operating frequency band upon activation of the first switching transistor, and a substantially high impedance upon deactivation of the first switching transistor, the first resonant circuit including a series resonance segment having a low impedance in the operating frequency band; wherein the resistive part of an input impedance of the low noise amplifier is matched to an impedance of the antenna and set independently of an output impedance of the power amplifier. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
-
Specification