Radio frequency transceiver front end circuit with matching circuit voltage divider
First Claim
1. A radio frequency (RF) transceiver front end circuit with a predefined operating frequency for connecting a transceiver to an antenna, the front end circuit comprising:
- an antenna port connectable to the antenna;
a transmit port;
a receive port;
a power amplifier including a first power amplifier transistor having a base coupled to the transmit port, a collector, and an emitter;
a low noise amplifier coupled to the transmit port including a first low noise amplifier transistor having a base, a collector, and an emitter;
a matching circuit including a power amplifier output matching segment coupled to the collector of the first power amplifier transistor and the antenna port, and a low noise amplifier input matching segment coupled to the base of the first low noise amplifier transistor and the antenna port, the power amplifier matching segment having shared components with the low noise amplifier segment; and
an intermediate junction coupling the low noise amplifier input matching segment and the power amplifier output matching segment including a voltage divider network.
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Accused Products
Abstract
A front end circuit for coupling an antenna to a radio frequency (RF) transceiver for time domain duplex systems is disclosed. The front end circuit includes an antenna port, a power amplifier, a low noise amplifier, and a matching network. The output of the power amplifier and the input of the low noise amplifier are coupled to the matching network and connected in common to the antenna. The power amplifier and the low noise amplifier are activated and deactivated in sequence corresponding to the transmit and receive modes of the transceiver, and the matching network minimizes the effect that one has on the other at the designated operating frequency.
59 Citations
14 Claims
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1. A radio frequency (RF) transceiver front end circuit with a predefined operating frequency for connecting a transceiver to an antenna, the front end circuit comprising:
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an antenna port connectable to the antenna; a transmit port; a receive port; a power amplifier including a first power amplifier transistor having a base coupled to the transmit port, a collector, and an emitter; a low noise amplifier coupled to the transmit port including a first low noise amplifier transistor having a base, a collector, and an emitter; a matching circuit including a power amplifier output matching segment coupled to the collector of the first power amplifier transistor and the antenna port, and a low noise amplifier input matching segment coupled to the base of the first low noise amplifier transistor and the antenna port, the power amplifier matching segment having shared components with the low noise amplifier segment; and an intermediate junction coupling the low noise amplifier input matching segment and the power amplifier output matching segment including a voltage divider network. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification