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Leakage Cancellation from Transmitter to Receiver

Shokrekhodaei, Maryam Sadat | 2015

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 49081 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Atarodi, Mojtaba; Safarian, Amin Ghasem
  7. Abstract:
  8. The wideband code-division multiple access (WCDMA) system has been widely used for the third-generation wireless communication system. It uses Frequency division duplexing for two-way communication by a transceiver. Although a duplexer will significantly suppress the TX leakage signal (50dB-60dB), a residual attenuated signal still remains at the receiver input and act as a strong blocker which reduces the sensitivity of the receiver. For reducing the effect of the TX leakage on the RX performance, a band pass RF SAW filter is typically inserted between the LNA and the mixer to reject the TX leakage. However, this filter increases the system cost and size. This encouraged us to propose a novel structure which suppresses TX leakage signal before the output node of the LNA by use of feed forward path which is integrated with the LNA. It boosts linearity of the LNA and relax the IIP3,OB and IIP2,OB requirement of the receiver that cause reduction of noise floor and result in sensitivity increment. Proposed structure is superior to other works with respect to power consumption and suppression of TX leakage signal without noise degradation in comparison with other works.Furthermore a new method of noise reduction is proposed which is applied to designed LNA.This has better noise performance and lower power consumption in comparison to the known noise reducing methods of CG LNAs. Proposed structure is designed in 180-nm CMOS technology and simulation results verified by post layout simulation
  9. Keywords:
  10. Low Noise Amplifier (LNA) ; Feedforward Path ; N-Path Filter ; Code Devision Multiple Access (CDMA) ; Wideband Communication ; Leakage Signal Transmitter to Reciver

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