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

fYear

2008

fDate

15-15 Oct. 2008

Firstpage

177

Lastpage

180

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;

fLanguage

English

Publisher

ieee

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

Type

conf

DOI

10.1109/MNRC.2008.4683407

Filename

4683407