DocumentCode
439163
Title
A 3-V delay-modulated PLL synthesizer for analog FM transmitters
Author
Rahkonen, Timo ; Tammelin, Saila ; Kostamovaara, Juha
Author_Institution
University of Oulu, Oulu, Finland
fYear
1997
fDate
16-18 Sept. 1997
Firstpage
64
Lastpage
67
Abstract
An analog FM modulator operating within the loop bandwidth of a frequency synthesizer is presented. Its operation is based on delay-modulating the reference frequency of the synthesizer PLL, thus causing phase modulation in the synthesized carrier. To convert delay-control to FM, modulating input is first integrated. The modulator circuit is implemented in a 1.2µm BiCMOS process, has 2.8 V supply voltage and 1.5 mA supply current. In in-system tests, the modulator showed 7 kHz/V gain, 20 Hz(rms) residual FM and -31..-37 dB THD on audio band.
Keywords
Bandwidth; BiCMOS integrated circuits; Delay; Frequency modulation; Frequency synthesizers; Integrated circuit synthesis; Phase locked loops; Phase modulation; Transmitters; Voltage;
fLanguage
English
Publisher
ieee
Conference_Titel
Solid-State Circuits Conference, 1997. ESSCIRC '97. Proceedings of the 23rd European
Conference_Location
Southampton, UK
Type
conf
Filename
1470864
Link To Document