## Abstract

In this work, we propose a frequency division duplexing (FDD) transceiver front-end (TFE) capable of canceling both the transmitter (TX) noise and reciprocal mixing (RM), under antenna voltage standing wave ratio (VSWR) variations. The TFE is composed of a quadrature balanced <inline-formula> <tex-math notation="LaTeX">$N$</tex-math> </inline-formula>-path receiver (QBNR) with the addition of a coupled auxiliary path to cancel reflected RM from the antenna. A discrete implementation incorporating two-port <inline-formula> <tex-math notation="LaTeX">$N$</tex-math> </inline-formula>-path (TPNP) filters manufactured in TSMC CMOS 65 nm is shown. Measurements of the proposed TFE show more than 27-dB TX noise cancellation, with NF of 6–7 dB in the presence of a 5-dBm modulated TX blocker, under VSWR of 2:1 and equal thermal and RM noise floors of <inline-formula> <tex-math notation="LaTeX">$-$</tex-math> </inline-formula>147 dBm/Hz, with power consumption of 57 mW at a 1.5-GHz local oscillator (LO) frequency.

Original language | English |
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Pages (from-to) | 1-8 |

Number of pages | 8 |

Journal | IEEE Transactions on Microwave Theory and Techniques |

DOIs | |

State | Accepted/In press - 2023 |

## Keywords

- <inline-formula xmlns:ali="http://www.niso.org/schemas/ali/1.0/" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"> <tex-math notation="LaTeX">$N$</tex-math> </inline-formula>-path filter
- Antennas
- Frequency division duplexing (FDD)
- Interference cancellation
- Microwave filters
- Mixers
- Noise measurement
- Reflector antennas
- Thermal noise
- quadrature balanced <inline-formula xmlns:ali="http://www.niso.org/schemas/ali/1.0/" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"> <tex-math notation="LaTeX">$N$</tex-math> </inline-formula>-path receiver (QBNR)
- self-interference cancellation (SIC)

## All Science Journal Classification (ASJC) codes

- Condensed Matter Physics
- Radiation
- Electrical and Electronic Engineering