RADIO FREQUENCY TRANSCEIVER FRONT END CIRCUIT WITH DIRECT CURRENT BIAS SWITCH
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 connectible 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 power amplifier input matching network coupling the transmit port and the base of the first power amplifier transistor;
a power amplifier control circuit with a first adjustable voltage source coupled to the base of the first power amplifier transistor, the power amplifier control circuit activating and setting a bias point of the first power amplifier transistor;
a low noise amplifier including a first low noise amplifier transistor having a base, a collector coupled to the receive port, and an emitter;
a low noise amplifier output matching network coupling the receive port and the collector of the first low noise amplifier transistor;
a low noise amplifier control circuit with a second adjustable voltage source coupled to the base of the first low noise amplifier transistor, the low noise amplifier control circuit activating and setting a bias point of the first low noise amplifier transistor;
a direct current bias switch coupled to the low noise amplifier and activated by the low noise amplifier control circuit; and
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.
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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.
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Citations
26 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 connectible 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 power amplifier input matching network coupling the transmit port and the base of the first power amplifier transistor; a power amplifier control circuit with a first adjustable voltage source coupled to the base of the first power amplifier transistor, the power amplifier control circuit activating and setting a bias point of the first power amplifier transistor; a low noise amplifier including a first low noise amplifier transistor having a base, a collector coupled to the receive port, and an emitter; a low noise amplifier output matching network coupling the receive port and the collector of the first low noise amplifier transistor; a low noise amplifier control circuit with a second adjustable voltage source coupled to the base of the first low noise amplifier transistor, the low noise amplifier control circuit activating and setting a bias point of the first low noise amplifier transistor; a direct current bias switch coupled to the low noise amplifier and activated by the low noise amplifier control circuit; and 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. 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 connectible 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 power amplifier input matching network coupling the transmit port and the base of the first power amplifier transistor; a power amplifier control circuit with a first adjustable voltage source coupled to the base of the first power amplifier transistor, the power amplifier control circuit activating and setting a bias point of the first power amplifier transistor; a low noise amplifier including a first low noise amplifier transistor and a cascode transistor each having a base, a collector, and an emitter; a low noise amplifier output matching network coupling the receive port and the collector of the first low noise amplifier transistor; a low noise amplifier control circuit with a second adjustable voltage source coupled to the base of the first low noise amplifier transistor, the low noise amplifier control circuit activating and setting a bias point of the first low noise amplifier transistor and the 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 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. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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Specification