MULTI MODE RADIO FREQUENCY TRANSCEIVER FRONT END CIRCUIT
First Claim
1. A front end circuit for coupling an antenna to a first radio frequency (RF) transceiver and a second RF transceiver, each of the RF transceivers having a respective one of a signal input, a signal output, a receive enable line and a transmit enable line, the front end circuit comprising:
- an antenna port connectable to the antenna;
a first power amplifier coupled to the signal output of the first RF transceiver, the first power amplifier including a first transmit control circuit coupled to the transmit enable line of the first RF transceiver;
a first low noise amplifier coupled to the signal input of the first RF transceiver, the first low noise amplifier including a first receive control circuit coupled to the receive enable line of the first RF transceiver;
a second power amplifier coupled to the signal output of the second RF transceiver, the second power amplifier including a second transmit control circuit coupled to the transmit enable line of the second RF transceiver;
a second low noise amplifier coupled to the signal input of the second RF transceiver, the second low noise amplifier including a second receive control circuit coupled to the receive enable line of the second RF transceiver; and
a matching network coupled to the antenna port, the first power amplifier, the second power amplifier, the first low noise amplifier and the second low noise amplifier, outputs of the first power amplifier and the second power amplifier and inputs of the first low noise amplifier and the second low noise amplifier all being common;
wherein an enable signal applied to a one of the first transmit enable line, the second transmit enable line, the first receive enable line, and the second receive enable line activating and setting a bias point of the corresponding one of the first power amplifier, the second power amplifier, the first low noise amplifier, and the second low noise amplifier.
7 Assignments
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Accused Products
Abstract
A front end circuit for coupling an antenna to a first radio frequency (RF) transceiver and a second RF transceiver is contemplated. The RF transceivers have a signal input, a signal output, a receive enable line and a transmit enable line. In addition to an antenna port, the front end circuit has a first power amplifier and a first low noise amplifier both coupled to first RF transceiver, and a second power amplifier and a second low noise amplifier both coupled to the second RF transceiver. The front end circuit includes a matching network that couples the power amplifiers and the low noise amplifiers, the various outputs and inputs thereof being common.
204 Citations
45 Claims
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1. A front end circuit for coupling an antenna to a first radio frequency (RF) transceiver and a second RF transceiver, each of the RF transceivers having a respective one of a signal input, a signal output, a receive enable line and a transmit enable line, the front end circuit comprising:
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an antenna port connectable to the antenna; a first power amplifier coupled to the signal output of the first RF transceiver, the first power amplifier including a first transmit control circuit coupled to the transmit enable line of the first RF transceiver; a first low noise amplifier coupled to the signal input of the first RF transceiver, the first low noise amplifier including a first receive control circuit coupled to the receive enable line of the first RF transceiver; a second power amplifier coupled to the signal output of the second RF transceiver, the second power amplifier including a second transmit control circuit coupled to the transmit enable line of the second RF transceiver; a second low noise amplifier coupled to the signal input of the second RF transceiver, the second low noise amplifier including a second receive control circuit coupled to the receive enable line of the second RF transceiver; and a matching network coupled to the antenna port, the first power amplifier, the second power amplifier, the first low noise amplifier and the second low noise amplifier, outputs of the first power amplifier and the second power amplifier and inputs of the first low noise amplifier and the second low noise amplifier all being common; wherein an enable signal applied to a one of the first transmit enable line, the second transmit enable line, the first receive enable line, and the second receive enable line activating and setting a bias point of the corresponding one of the first power amplifier, the second power amplifier, the first low noise amplifier, and the second low noise amplifier. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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27. A front end circuit for radio frequency transceivers having a predefined operating frequency for connecting the transceivers to an antenna, the front end circuit comprising:
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an antenna port connectable to the antenna; a first transmit port associated with a first one of the transceivers; a first receive port associated with the first one of the transceivers; a shared transmit and receive port associated with a second one of the transceivers; a first power amplifier including a first power amplifier transistor having a base coupled to the first transmit port a collector, and an emitter; a second power amplifier including a second power amplifier transistor having a base coupled to the shared transmit and receive port, a collector and an emitter; a first low noise amplifier including a first cascode transistor having a base, a collector, and an emitter; a second low noise amplifier including a second cascode transistor having a base, a collector, and an emitter; a low noise amplifier transistor having a base, an emitter, and a collector coupled to the emitter of the first cascode transistor and the emitter of the second cascode transistor; and a matching circuit including a power amplifier output matching segment coupled to the collector of the first power amplifier transistor and the collector of the second power amplifier transistor, and a low noise amplifier input matching segment coupled to the base of the low noise amplifier transistor, the power amplifier matching segment having shared components with the low noise amplifier input matching segment. - View Dependent Claims (28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44)
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45-89. -89. (canceled)
Specification