TRANSFORMER BASED DUPLEXER
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United States of America Patent
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Issued Date -
Dec 29, 2016
app pub date -
Jun 26, 2015
filing date -
Jun 26, 2015
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Abstract
A tunable transformer based duplexer (TTBD) comprising a first antenna port and a second antenna port. The TTBD further comprises a first winding coupled between a transmitting port and the first antenna port, wherein the first antenna port is configured to receive a first signal; a second winding coupled between the transmitting port and the second antenna port, wherein the second antenna port is configured to receive a second signal. Further, the TTBD comprises a receiving amplifier comprising at least one input and at least one output. The TTBD also comprises a third winding comprising a first terminal and a second terminal. The third winding comprises a first inductance and is coupled to the at least one output of the amplifier circuit. A first coupling is formed between the first winding and the third winding and a second coupling is formed between the second winding and the third winding. The TTBD further comprises a tunable capacitance coupled between the first terminal and the second terminal of the third winding. The tunable capacitance and the first inductance together form a band-pass filter.
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