Title :
Frequency modulation and control in quadrature ring oscillator for multiband FM/FSK transmitters
Author :
Reja, Md Mahbub ; Moez, Kambiz ; Filanovsky, Igor
Author_Institution :
Dept. of Electr. & Comput. Eng., Univ. of Alberta Edmonton, Edmonton, AB
Abstract :
A circuit for wide range frequency modulation and control in a quadrature ring oscillator for multiband FM/FSK transmitter is presented. The modulation and control signal are applied to the oscillator transmission gates via the floating current source circuit. The current of this source repeats the input control current that includes two components, one of which tunes the mid-frequency and the other tunes the modulation depth. Each of the control components is set independently. This precise and wide-range frequency control allows one to use it in multiband applications. The proposed circuit is designed in 0.18 mum standard digital CMOS process for intended carrier frequencies of two ISM bands (900 MHz, and 2.4 GHz).
Keywords :
CMOS digital integrated circuits; frequency modulation; radio transmitters; FM transmitters; FSK transmitters; digital CMOS process; floating current source circuit; frequency 2.9 GHz; frequency 900 MHz; frequency control; frequency modulation; multiband transmitters; oscillator transmission gates; quadrature ring oscillator; CMOS process; Circuits; Frequency modulation; Frequency shift keying; Radio transmitters; Ring oscillators; Signal generators; Varactors; Voltage control; Voltage-controlled oscillators;
Conference_Titel :
Microsystems and Nanoelectronics Research Conference, 2008. MNRC 2008. 1st
Conference_Location :
Ottawa, Ont.
Print_ISBN :
978-1-4244-2920-2
Electronic_ISBN :
978-1-4244-2921-9
DOI :
10.1109/MNRC.2008.4683407
