System and method to reduce unwanted receive signal leakage during switching

A method for switching RF signals, comprising:

• selectively coupling a first band filter, a second band filter and a third band filter to one or more of a first antenna and a second antenna using a switch comprising at least a first switch element and a second switch element configured to receive complementary control signals;
• selectively coupling the first band filter and the second band filter to the first antenna;
• selectively coupling the third band filter to the first antenna to the third band filter instead of the second band filter while the first band filter remains coupled to the first antenna and a first communication path through the first band filter to the first antenna remains active;
• and
• selectively switching the first antenna to connect from the second band filter to the third band filter while delaying at least one of the complementary control signals by an amount defined by a difference (delta) between an ON to OFF time (Toff) and an OFF to ON time (Ton) of the at least two switch elements.

A device for switching, comprising:

• means for selectively coupling a first band filter, a second band filter and a third band filter to one or more of a first antenna and a second antenna using a switch comprising at least a first switch element and a second switch element configured to receive complementary control signals;
• means for selectively coupling the first band filter and the second band filter to the first antenna;
• means for selectively coupling the third band filter to the first antenna to the third band filter instead of the second band filter while the first band filter remains coupled to the first antenna and a first communication path through the first band filter to the first antenna remains active;
• and
• means for selectively switching the first antenna to connect from the second band filter to the third band filter while delaying at least one of the complementary control signals by an amount defined by a difference (delta) between an ON to OFF time (Toff) and an OFF to ON time (Ton) of the at least two switch elements.

A communication device, comprising:

• a radio frequency (RF) transceiver;
• an RF switching system connected to the RF transceiver, the RF switching system having a plurality of band filters comprising a first band filter a second band filter and a third band filter, the first, second and third band filters configured to process signals in different communication bands;
• a switch located between the first, second and third band filters and a first and a second antenna, the switch configured to selectively couple the first, second and third filters to the first and second antennas, the switch comprising at least a first switch element and a second switch element configured to receive complementary control signals;
• wherein at least the first and the second filter are configured to be simultaneously coupled to the first antenna and the switch is configured to delay at least one of the complementary control signals by an amount defined by a difference (delta) between an ON to OFF time (Toff) and an OFF to ON time (Ton) of the at least two switch elements when the switch, in response to the complementary control signals, is configured to selectively connect the first antenna to the third filter instead of the second filter while the first filter is coupled to the first antenna and a first communication path through the first filter to the first antenna is active.