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US 2018/0123635 A1Published application
Tunable Duplexer
AssigneeACCO Corporation
InventorsZakaria Settaf, Hervé Cam, Guillaume Blamon
Life of this patent
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Abstract
A signal cancelling duplexer is provided. Duplexers of the invention add equal amounts of a transmission signal and an out-of-phase component of the same transmission signal at the receiver, so that both signals cancel. Duplexers of the invention can be switched between multiple channels by changing switch settings within the duplexer. RF transceivers including a power amplifier, receiver amplifier, and the signal cancelling duplexer are also provided.
Claims21
A duplexer comprising:
- a first coupler having four ports where a signal received at a first port is divided between the other three ports such that a first portion of the signal is directed to a second port, and a second portion of the signal is split between a third port thereof and a fourth port thereof, that portion of the signal reaching the third port including a 90° phase shift, the portions of the signal reaching the second and fourth ports not being phase shifted;
- a second coupler identical to the first coupler;
- a first phase shifter coupled between the third port of the first coupler and a first port of the second coupler, another port of the second coupler being coupled to the second port of the first coupler;
- and
- a second phase shifter coupled between the fourth port of the first coupler and a same port of the second coupler.
2 more elements
A transceiver for operation in several channels comprising:
- a power amplifier,
- a receiver amplifier, and
- a duplexer including
- a first coupler having four ports and configured such that a signal, received at a first port coupled to the power amplifier, is divided between the other three ports such that a first portion of the signal is directed to a second port thereof, and a second portion of the signal is split between a third port thereof and a fourth port thereof, that portion of the signal reaching the third port including a 90° phase shift, the portions of the signal reaching the second and fourth ports not being phase shifted,
- a second coupler identical to the first coupler,
- a first phase shifter coupled between the third port of the first coupler and a first port of the second coupler, another port of the second coupler being coupled to the second port of the first coupler, and
- a second phase shifter coupled between the fourth port of the first coupler and a same port of the second coupler,
- wherein the receiver is coupled to a last port of the second coupler.
5 more elements
A method comprising:
- splitting a received signal into a first portion and a second portion;
- phase shifting a component of the first portion of the signal by 180°;
- phase shifting a first component of the second portion of the signal by 180°;
- combining the phase-shifted components with a second component of the second portion of the signal.
1 more element
A coupler comprising:
- A first port, a second port, a third port, and a fourth port;
- a first inductor coupled between the first and third ports;
- a second inductor coupled between the second and fourth ports;
- a first capacitor coupled between the first port and the first inductor;
- a second capacitor coupled between the second port and the second inductor;
- a third capacitor coupled between the third and fourth ports;
- a fourth capacitor coupled between the third port and ground;
- a fifth capacitor coupled between the first and second ports;
- a sixth capacitor coupled between the first port and ground;
- and
- a seventh capacitor coupled between the second port and ground, wherein the first, second, third, fifth, sixth, and seventh capacitors are switchable.
8 more elements
Dependencies are inferred from the claim text.