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In this paper we propose a variable-gain transimpedance amplifier suitable for low-power applications. Its noise, bandwidth and input impedance performance are similar to a more conventional regulated-cascode common-gate transimpedance with resistive load, with the same power consumption and gain performance. The proposed amplifier has, however, variable gain, which can be easily changed by setting...
A 900 MHz direct-conversion receiver for UHF RFID readers with low power, high linearity, and low noise in UMC 0.18 ??m CMOS technology is proposed. This receiver possesses I/Q two paths and each path consists of a passive mixer, an IF amplifier, a RC low-pass filter and a comparator. It supports a LO frequency from 860 MHz to 960 MHz and a data rate from 40 kb/s to 1 Mb/s which are in accordance...
A wideband receiver for cognitive radio spectrum sensing unit is presented. The circuit consists of a high linearity low noise amplifier, passive mixer, and baseband buffer. IQ signals for the LO are generated using a divide-by-two circuit. Low noise amplifier includes common-gate common-source combination for simultaneous interference suppression and noise canceling. The receiver operates in the...
A 2.4 GHz CMOS amplifier with third-order intermodulation distortion cancellation is presented based on the derivative superposition technique. The proposed circuit uses a conventional amplifier topology followed by a distortion cancellation circuit that can significantly improve third-order linearity. To quantify the linearity improvement, two general-purpose amplifiers were fabricated and measured:...
A CMOS mixer was design with a new circuit scheme to realize low voltage and high linearity simultaneously. A double balanced Gilbert cell was adopted as the basic topology and TSMC 0.18 mum 1P6M CMOS process was employed for the on-chip RF circuit fabrication. The proposed new circuit scheme consists of LC-tanks as a capacitively coupled resonator for low voltage and multi-stage parallel RC networks...
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