Duplexer with balanced impedance ladder

Abstract

An electrical balance duplexer has multiple impedance gradients and multiple impedance tuners. The electrical balance duplexer transmits an outgoing signal from a transmitter during a transmission mode when a first set of impedance gradients of the multiple impedance gradients is operating in a first impedance state and a first set of impedance tuners of the multiple impedance tuners is operating in a second state. The electrical balance duplexer isolates the outgoing signal from a receiver during the transmission mode when a second set of impedance gradients of the multiple impedance gradients and a second set of impedance tuners of the multiple impedance tuners are operating in the second impedance state.

1 . A duplexer, comprising:
 a transmitter port coupled to transmitter circuitry of an electronic device; and   a plurality of transmitter impedance devices configured to couple the transmitter port to one or more antennas of the electronic device.   
     
     
         2 . The duplexer of  claim 1 , wherein the transmitter port is configured to provide a transmission signal from the transmitter circuitry to the one or more antennas based on the plurality of transmitter impedance devices coupling the transmitter port to the one or more antennas during a transmission mode. 
     
     
         3 . The duplexer of  claim 2 , comprising:
 a receiver port coupled to receiver circuitry of the electronic device; and   a plurality of receiver impedance devices configured to uncouple the receiver port from the one or more antennas during the transmission mode.   
     
     
         4 . The duplexer of  claim 3 , wherein the plurality of transmitter impedance devices is serially coupled to the plurality of receiver impedance devices. 
     
     
         5 . The duplexer of  claim 3 , wherein the plurality of receiver impedance devices is configured to reduce insertion loss of the transmission signal and isolate the receiver port from the transmitter port during the transmission mode by causing 0 Volts across the receiver port. 
     
     
         6 . The duplexer of  claim 1 , wherein the plurality of transmitter impedance devices comprises a first transmitter impedance device, a second transmitter impedance device, a third transmitter impedance device, and a fourth transmitter impedance device, the plurality of transmitter impedance devices being configured to operate in the transmission mode based on a first ratio of a first impedance of the first transmitter impedance device to a second impedance of the second transmitter impedance device being different from a second ratio of a third impedance of the third transmitter impedance device to a fourth impedance of the fourth transmitter impedance device. 
     
     
         7 . The duplexer of  claim 1 , comprising a transmitter bridge configured to couple the transmitter port to a ground terminal during the transmission mode. 
     
     
         8 . The duplexer of  claim 1 , wherein the plurality of transmitter impedance devices is configured to operate in an unbalanced state during the transmission mode, the unbalanced state comprising an unequal ratio of impedances of the plurality of transmitter impedance devices. 
     
     
         9 . Isolation circuitry, comprising:
 a receiver port coupled to receiver circuitry of an electronic device; and   a plurality of receiver impedance devices configured to couple the receiver port to one or more antennas of the electronic device during a reception mode, the receiver port being configured to provide a reception signal from the one or more antennas to the receiver circuitry based on the plurality of receiver impedance devices coupling the receiver port to the one or more antennas during the reception mode.   
     
     
         10 . The isolation circuitry of  claim 9 , comprising:
 a transmitter port coupled to transmitter circuitry of the electronic device, and   a plurality of transmitter impedance devices configured to uncouple the transmitter port from the one or more antennas during the reception mode.   
     
     
         11 . The isolation circuitry of  claim 10 , wherein the plurality of transmitter impedance devices is configured to reduce insertion loss of the reception signal and isolate the receiver port from the transmitter port during the reception mode by causing 0 Volts across the transmitter port. 
     
     
         12 . The isolation circuitry of  claim 10 , comprising a transmitter bridge configured to uncouple the transmitter port from the one or more antennas during the reception mode based on a first ratio of a first impedance of a first transmitter impedance device of the plurality of transmitter impedance devices to a second impedance of a second transmitter impedance device of the plurality of transmitter impedance devices correlating to a second ratio of a third impedance of a third transmitter impedance device of the plurality of transmitter impedance devices to a fourth impedance of a fourth transmitter impedance device of the plurality of transmitter impedance devices. 
     
     
         13 . The isolation circuitry of  claim 9 , wherein the plurality of receiver impedance devices comprises a first receiver impedance device, a second receiver impedance device, a third receiver impedance device, and a fourth receiver impedance device, the plurality of receiver impedance devices being configured to operate in the reception mode based on a first ratio of a first impedance of the first receiver impedance device to a second impedance of the second receiver impedance device being different than a second ratio of a third impedance of the third receiver impedance device to a fourth impedance of the fourth receiver impedance device. 
     
     
         14 . The electronic device of  claim 9 , wherein the plurality of receiver impedance devices is configured to operate in an unbalanced state during the reception mode, the unbalanced state comprising unequal ratio of impedances of the plurality of receiver impedance devices. 
     
     
         15 . Isolation circuitry, comprising:
 a first set of impedance devices configured to couple transmitter circuitry to at least one antenna of an electronic device; and   one or more processors configured to
 set a first impedance gradient and a second impedance gradient of the first set of impedance devices to a first impedance state, 
 set a first impedance tuner and a second impedance tuner of the first set of impedance devices to a second impedance state, and 
 transmit data from the transmitter circuitry using the at least one antenna. 
   
     
     
         16 . The isolation circuitry of  claim 15 , comprising a transmitter port coupled to the transmitter circuitry, wherein setting the first impedance gradient and the second impedance gradient to the first impedance state and the first impedance tuner and the second impedance tuner to the second impedance state causes the transmitter port to couple to the at least one antenna. 
     
     
         17 . The isolation circuitry of  claim 16 , comprising:
 a receiver port coupled to receiver circuitry; and   a second set of impedance devices configured to couple the receiver port to the at least one antenna, the one or more processors being configured to set the second set of impedance devices to the second impedance state, causing the receiver port to uncouple from the at least one antenna.   
     
     
         18 . The isolation circuitry of  claim 17 , wherein the first set of impedance devices is serially coupled to the second set of impedance devices, the first impedance state comprising a greater impedance than the second impedance state. 
     
     
         19 . The isolation circuitry of  claim 17 , wherein setting the second set of impedance devices to the second impedance state comprises correlating an impedance of each impedance device of the second set of impedance devices to one another. 
     
     
         20 . The isolation circuitry of  claim 17 , wherein the second impedance state causes 0 Volts across the receiver port.