TDD receiver protection
First Claim
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1. An apparatus comprising:
- a time-division duplex (TDD) transceiver comprising a transmitter and a receiver, wherein the receiver further comprises a first low-noise-amplifier (LNA);
a first hybrid coupler comprising an input port configured to receive radio frequency (RF) signals, a first output port coupled to an input of the first LNA, a second output port, and an isolation port;
a first diode with an anode coupled to the input of the first LNA and a cathode coupled to a ground (GND);
a first controller coupled to the anode of the first diode and configured to generate a first control signal for turning on the first diode when the TDD transceiver is in a transmission mode; and
a load coupled to the isolation port configured to consume any energy from RF signals reflected to the first and second output ports.
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Abstract
Techniques are provided herein for a receiver protection circuit in a time-division duplex (TDD) system. The receive protection circuit has a first diode with an anode that is coupled to an input of a low-noise-amplifier (LNA) and a cathode that is coupled to a ground. A controller is coupled to the anode of the diode and is configured to generate a control signal for turning on the diode when the TDD system is in a transmission mode. A load is coupled to the diode such that a reflected transmit signal is shorted to the ground by the diode and the radio frequency energy carried in the reflected transmit signal is consumed by the load.
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Citations
22 Claims
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1. An apparatus comprising:
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a time-division duplex (TDD) transceiver comprising a transmitter and a receiver, wherein the receiver further comprises a first low-noise-amplifier (LNA); a first hybrid coupler comprising an input port configured to receive radio frequency (RF) signals, a first output port coupled to an input of the first LNA, a second output port, and an isolation port; a first diode with an anode coupled to the input of the first LNA and a cathode coupled to a ground (GND); a first controller coupled to the anode of the first diode and configured to generate a first control signal for turning on the first diode when the TDD transceiver is in a transmission mode; and a load coupled to the isolation port configured to consume any energy from RF signals reflected to the first and second output ports. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A system comprising:
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a time-division duplex (TDD) transmitter; a TDD receiver with a first low-noise-amplifier (LNA); a circulator coupled between the TDD transmitter and TDD receiver; a receiver protection circuit comprising; a first diode with an anode coupled to an input of a first low-noise-amplifier (LNA) and a cathode coupled to a ground (GND); a first controller coupled to the anode of the first diode configured to generate a first control signal for turning on the first diode when the system is in a transmission mode; a first hybrid coupler coupled between the circulator and the first LNA; and a load coupled to the first diode through the first hybrid coupler. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. An apparatus comprising:
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a first hybrid coupler comprising an input port configured to receive radio frequency (RF) signals; a first low-noise-amplifier (LNA) and a second LNA balanced to each other, and both are coupled to the first hybrid coupler; a first diode with an anode coupled to an input of the first LNA and a cathode coupled to a ground (GND); a second diode with an anode coupled to an input of the second LNA and a cathode coupled to the GND; at least one controller coupled to the anodes of both the first and second diodes and configured to generate a control signal for turning on both the first and second diodes; and a load coupled to the first hybrid coupler configured to consume any energy reflected from RF signals received through the first hybrid coupler. - View Dependent Claims (18, 19, 20, 21, 22)
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Specification