hwait的博客

the recording engineers handbook

sound advice on microphone techniques

Sound in the time domain

心形线绘制，EXCEL实现

Qi V1.3 Reference design PRX

Qi V1.3 Reference design PTX

Qi V1.3 NFC/RFID Card Protection

Qi V1.3 physical layer

Qi specification

3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Radio Access (E-UTRA); User Equipment (UE) conformance specification Radio transmission and reception Part 1: Conformance Testing; (Release 10)

3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); User Equipment (UE) conformance specification Radio transmission and reception Part 1: Conformance Testing; (Release 8)

The 3GPP TS 36.521-1 “Radio transmission and reception” LTE User Equipment (UE) conformance specification defines the measurement procedures for LTE terminals with regard to their transmitting characteristics, receiving characteristics and performance requirements as part of the 3G Long Term Evolution (3G LTE) standard. This application note describes how to use the LTE Frequency Division Duplex (FDD) and Time Division Duplex (TDD) measurement functionality provided by the R&SCMW500 wideband radio communication tester to perform LTE R8 transmitter and receiver measurements according to this test specification.

2. CFT分为BT校准和FT（综测）两部分 2.1 BT主要是对手机的射频参数进行调整，具体包括(MTK校准必选项): 自动频率校准（AFC）。 自动增益控制校准（AGC),对MTK平台来说叫着Pathloss。 自动功率控制校准（APC） 电池电量指示校准(ADC)。 校准通过后，程序会在校准数据区写一个通过校准标志 2. 2 FT 的全称为Final Test(综合测试)，主要是测试手机的一些射频指标,具体包括： 峰值功率(PeakPower) 功率时间模板(Burst Mask)。 峰值相位误差(PeakPhaseError)。(+/-20) 均方根相位误差(RMS PhaseError)。(+/-5) 频率误差(FreqError)。(0.1ppm) 灵敏度（Ber)。(-102,<%2.439) 接收信号强度(RXLevel)。 开关谱（Switch Spectrum)。 调制谱(Moduation Spectrum)。 备注：红色部分为必须测试的射频指标。

EMV Integrated Circuit Card Specifications for Payment Systems Book 1 Application Independent ICC to Terminal Interface Requirements

history of RFID Many things are hidden in the shrouds of time. The task of tracing history and genealogy is arduous and challenging, but, ultimately, rewarding. Our past can open doors to our future. Whether we realize it or not, RFID (radio frequency identification) is an integral part of our life.

无源CMMB/DVBH天线,手机电视天线

RFID 读卡器手册ISO 14443A