Xu Q.,Guobo Electronics Co. |
Zeng R.,Guobo Electronics Co. |
Miao Y.,Guobo Electronics Co. |
Huang Z.,Guobo Electronics Co.
Guti Dianzixue Yanjiu Yu Jinzhan/Research and Progress of Solid State Electronics
A new RF transmitter-receiver front end for ETC was designed and implemented. A new type of ASK modulation circuit was proposed. By comparison with the traditional module, the new transmitter-receiver module exhibits better performance. In the module a digital and two analog attenuators are used in transmitting channel and two AGC amplifier chips are used in receiving channel. The measurement results are as follows: ASK modulation depth range is 30%~100%; the receiver dynamic range is -5~-85 dBm; transmission power adjusting range is -4.5~27 dBm with step size 0.5 dB; location oscillator frequency adjusting range is 5 700~5 900 MHz with step size 1 MHz. Source