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US 2019/0245491 A1Published application
Tdd transmit-receive front end circuit without a rf t-r switch
AssigneeDuet Microelectronics Inc.
InventorRobert Bayruns
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AssigneeDuet Microelectronics Inc.
InventorRobert Bayruns
Estimating the term…
A transmit-receive (T-R) circuit is switchable for both small and large signals using a high impedance low noise amplifier, which lacks T-R switches, and which permits implementation using only bipolar transistors for integration into the fabrication of integrated circuits. The relatively large T-R switch loss is eliminated, resulting in better efficiency in operation of the T-R circuit. When the T-R circuit is in a transmit mode, a power amplifier is in an ON state, and the low noise amplifier is in an OFF state, such that the low noise amplifier has a high impedance between the LNA input and the LNA output to block a first signal from the LNA input from reaching the antenna. When the T-R circuit is in a receive mode, the power amplifier is in an OFF state, and the low noise amplifier is in an ON state with a low impedance.
A circuit comprising:
A time-division duplex (TDD) circuit comprising:
A low noise amplifier (LNA) comprising:
Dependencies are inferred from the claim text.