Title :
Bandwidth considerations for a CALLUM transmitter architecture
Author :
Strandberg, Roland ; Andreani, Pietro ; Sundstr?¶m, Lars
Author_Institution :
Dept. of Electroscience, Lund Univ., Sweden
fDate :
6/24/1905 12:00:00 AM
Abstract :
This article presents an investigation of the combined analog locked loop universal modulator (CALLUM) linear transmitter architecture. A simple approximate formula is derived, linking the instantaneous frequency of the CALLUM signals to the modulation depth of the information signal. Furthermore, the effect of the frequency mismatch between the VCOs present in the CALLUM architecture is examined, and the need for frequency synchronization via a phase locked loop is discussed.
Keywords :
circuit feedback; modulators; phase locked loops; radio transmitters; synchronisation; voltage-controlled oscillators; CALLUM signal instantaneous frequency; PLL; VCO frequency mismatch effect; combined analog locked loop universal modulator linear transmitter architecture; frequency synchronization; information signal modulation depth; output signal feedback; phase locked loop; transmitter bandwidth considerations; Amplitude modulation; Bandwidth; Channel capacity; Circuit synthesis; Frequency synchronization; Joining processes; Nonlinear distortion; Phase modulation; Radio transmitters; Signal to noise ratio;
Conference_Titel :
Circuits and Systems, 2002. ISCAS 2002. IEEE International Symposium on
Print_ISBN :
0-7803-7448-7
DOI :
10.1109/ISCAS.2002.1010379
