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tx-leakage
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Circuit and system design for an 860-960 MHz RFID reader front-ends with Tx leakage suppression in 0.18 - μm CMOS technology
, Article International Journal of Circuit Theory and Applications ; Volume 40, Issue 9 , MAR , 2012 , Pages 957-974 ; 00989886 (ISSN) ; Atarodi, S. M ; Luong, H. C ; Sharif University of Technology
Wiley
2012
Abstract
This paper presents an RF Front-END for an 860-960thinspaceMHz passive RFID Reader. The direct conversion receiver architecture with the feedback structure in the RF front-end circuit is used to give good immunity against the large transmitter leakage and to suppress leakage. The system design considerations for receiver on NF and IIP3 have been discussed in detail. The RF Front-END contains a power amplifier (PA) in transmit chain and receive front-end with low-noise amplifier, up/down mixer, LP filter and variable-gain amplifier. In the transmitter, a differential PA with a new power combiner is designed and fabricated in a 0.18-μm technology. The chip area is 2.65 mm × 1.35 mm including...
Transmitter leakage cancellation technique for CMOS SAW-less radio front-ends
, Article Analog Integrated Circuits and Signal Processing ; Volume 93, Issue 3 , 2017 , Pages 383-394 ; 09251030 (ISSN) ; Safarian, A ; Atarodi, M ; Sharif University of Technology
Abstract
A novel method of transmitter (TX) leakage cancellation is presented to improve the dynamic range of the receiver for wideband code division multiple access applications. The large TX leakage is attenuated within the low noise amplifier (LNA) output using a feed-forward path without any LNA noise figure degradation. A prototype has been designed and laid out in 0.18 μm CMOS technology. It achieves a maximum TX rejection of 18.5 dB with only 5.2 mA current consumption from 1.8 V supply voltage. LNA P-1dBCP (1 dB gain compression point) against TX leakage improves by more than 10 dB. Post layout simulations verify these results. Proposed structure dispels the requirement of off-chip surface...
A single-antenna w-band FMCW radar front-end utilizing adaptive leakage cancellation
, Article 2020 IEEE International Solid-State Circuits Conference, ISSCC 2020, 16 February 2020 through 20 February 2020 ; Volume 2020 , February , 2020 , Pages 88-90 ; Shirinabadi, H ; Fotowat Ahmadi, A ; Yue, C. P ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
2020
Abstract
Millimeter-wave radars are essential for automotive sensing, medical imaging, and safety- monitoring applications. Among different architectures, frequency-modulated continuous-wave (FMCW) radars are particularly suited for miniature integration targeting portable consumer applications with detection ranges up to a few tens of meters. This translates to a relatively low requirement of transmitter (TX) output peak power and hence is well suited for implementation using low-supply-voltage CMOS processes. To avoid saturating the receiver (RX) under CW operation, FMCW radars must achieve high TX-to-RX isolation in the front-end. Typically, at least 40dB of isolation is necessary for W-band (75...