Browsing by Author "Chang, Yao-Wei"

Now showing 1 - 2 of 2

Tunable Delay Compensation Circuit in Polar Loop Transmitter for WiMAX Applications
(2010-01-01)
Chang, Yao-Wei
;
Kuo, Chien-Nan
;
電子工程學系及電子研究所
;
Department of Electronics Engineering and Institute of Electronics
In this paper, a time delay circuit is designed for path mismatch compensation in the polar loop transmitter for the WiMAX standard. The delay circuit contains two stages, each realized in the second-order form of the Pade approximant, to account for a tuning range from 1 ns to 10 ns in 1 ns steps. The proposed circuit is fabricated using 0.35-mu m SiGe technology in order to be incorporated into a fully integrated transmitter in the future. The measurement result in network analyzer shows the delay dispersion in worst case within 30 MHz signal bandwidth has 7% variation and has gain dispersion 1.4 dB.
Wideband Time-Delay Circuit
(2011-01-01)
Chang, Yao-Wei
;
Yan, Tzu-Chao
;
Kuo, Chien-Nan
;
電子工程學系及電子研究所
;
Department of Electronics Engineering and Institute of Electronics
Limitations of the delay bandwidth in active delay circuits can be significantly improved in high-order transfer functions. In this paper, a flat wideband delay circuit is presented using the 2nd-order form of the Pade approximant. The delay circuit is designed and implemented in 0.18 mu m CMOS technology. The measured results show that the circuit achieves a delay time of 49 psec in the GHz frequency range. The power consumption of the core circuit is 7.88 mW from 1.8 V supply voltage. The entire die occupies an area of 520x820 mu m(2)