Robust digital receiver for EPC sensor network

A robust digital receiver based on a matched filter （MF） is proposed for the radio frequency identification （RFID） reader system to enhance the reliability of signal processing in the electronic product code （EPC） sensor network （ESN）. The performance of the proposed receiver is investigated by examining the anti-collision algorithm in the EPC global Class1 Generation2 protocol. The validity and usefulness are demonstrated by both computer simulations and experiments. Based on the verification results, comparing with the conventional zero crossing detector （ZCD） based receiver, the proposed receiver is very robust against strong amplitude distortions and considerable frequency deviations happening on the backscattered signal from a passive tag.

A Behavior Level Analytical Method of Electromagnetic Susceptibility for Radio Frequency Receiver

Based on simplified Volterra model, a behavior-level simulation analysis approach of electromagnetic susceptibility （EMS） for radio frequency （RF） receiver is presented in this article. Third order simplified Volterra model is adopted to analyze receiver EMS. A general criterion for EMS is proposed according to EMS response characteristics in frequency domain, and then the simulation flow charts for calculating susceptibility thresholds are given. This approach is superior to the previous EMS analysis method on receiver, which mainly relies on experiments but lack simulation analysis. Take the dual frequency GPS receiver and zero IF receiver interfered by continue wave as examples for in-band and out-of-band susceptibility threshold calculation. Simulation results show that the proposed method is not only valid and effective, but also reduces the internal storage and simulation time, which is suitable to RF receiver EMS analysis and practical in engineering and technology field.

低压CMOS折叠共源共栅混频器(英文)

The folded-cascode structure is used to realize the low-voltage low-power consumption mixer, whose performance parameters have big influence on the navigation radio receiver＇s performance. Adopting the folded-cascode structure, the folded-cascode mixer （FCM） has a lower power supply voltage of 1.2 V and realizes the design trade-offs among the high transconductance, high linearity and low noise. The difficulties of realizing the trade-offs between the linearity and noise performance, the linearity and conversion gain, the conversion gain and noise performance are reduced. Fabricated in an radio frequency （RF） 0.18 μm CMOS process, the FCM has an active area of about 200 μm ×150 μm and consumes approximate 3.9 mW. The test results show that the FCM features a conversion gain （Gc） of some 14.5 dB, an input 1 dB compression point （Pin-1dB） of almost -13 dBm and a dual sideband （DSB） noise figure of around 12 dB. The FCM can be applied to the navigation radio receivers and electronic systems for aviation and aerospace or other related fields.

A RF receiver frontend for SC-UWB in a 0.18-μm CMOS process

A radio frequency （RF） receiver frontend for single-carrier ultra-wideband （SC-UWB） is presented. The front end employs direct-conversion architecture, and consists of a differential low noise amplifier （LNA）, a quadrature mixer, and two intermediate frequency （IF） amplifiers. The proposed LNA employs source inductively degenerated topology. First, the expression of input impedance matching bandwidth in terms of gate-source ca- pacitance, resonant frequency and target Sll is given. Then, a noise figure optimization strategy under gain and power constraints is proposed, with consideration of the integrated gate inductor, the bond-wire inductance, and its variation. The LNA utilizes two stages with different resonant frequencies to acquire flat gain over the 7.1-8.1 GHz frequency band, and has two gain modes to obtain a higher receiver dynamic range. The mixer uses a double bal- anced Gilbert structure. The front end is fabricated in a TSMC 0.18-μm RF CMOS process and occupies an area of 1.43 mm2. In high and low gain modes, the measured maximum conversion gain are 42 dB and 22 dB, input 1 dB compression points are -40 dBm and -20 dBm, and Sll is better than -18 dB and -14.5 dB. The 3 dB IF bandwidth is more than 500 MHz. The double sideband noise figure is 4.7 dB in high gain mode. The total power consumption is 65 mW from a 1.8 V supply.