Title :
GHz programmable dual-modulus prescaler for multi-standard wireless applications
Author :
Ahn, Hong Jo ; Ismail, Mohamed
Author_Institution :
Dept. of Electr. Eng., Ohio State Univ., Columbus, OH, USA
fDate :
6/24/1905 12:00:00 AM
Abstract :
A new and simple approach to design a programmable prescaler for wireless applications is presented. Employing an expanded ring counter chain and a de-multiplexer in the counter loop results in an accurate frequency division and can provide various frequency-division ratios. The ring counter is implemented with true-single-phase (TSPC) type DFF and PTL (pass transistor logic) type demultiplexer to enhance speed performance. PTL output is bootstrapped. With 0.5 μm CMOS technology and 3.3/5-V supply, the prescaler is aimed for GSM900/CDMA applications in this paper. The proposed prescaler structure can be adopted for multi-standard wireless applications covering DCS1800, WCDMA, and Bluetooth.
Keywords :
CMOS digital integrated circuits; bootstrap circuits; cellular radio; code division multiple access; demultiplexing equipment; prescalers; programmable circuits; telecommunication standards; wireless LAN; 0.5 micron; 1800 MHz; 3.3 V; 5 V; 900 MHz; Bluetooth; CMOS; DCS1800; GSM900/CDMA applications; PTL output; WCDMA; bootstrapped output; de-multiplexer; dual-modulus prescaler; expanded ring counter chain; frequency-division ratios; multi-standard wireless applications; pass transistor logic de- multiplexer; programmable prescaler; true-single-phase de- multiplexer; CMOS logic circuits; CMOS technology; Clocks; Counting circuits; Distributed control; Frequency conversion; Frequency synthesizers; Multiaccess communication; Multiplexing; Very large scale integration;
Conference_Titel :
Circuits and Systems, 2002. ISCAS 2002. IEEE International Symposium on
Print_ISBN :
0-7803-7448-7
DOI :
10.1109/ISCAS.2002.1009796
