Title :
A circular voltage-controlled phase shifter with unlimited phase range for phase tracking loops
Author :
Chun, Byungjin ; Zhang, Zheyao ; Lidholm, Sverre
Author_Institution :
Dept. of Microelectron. Eng., Univ. Coll. Cork, Cork
Abstract :
A circular voltage-controlled phase shifter (VCPS) is proposed to extend the range of the controlled output phase shift unlimitedly. This is made possible by configuring the system to operate in a circular way, differently from the conventional VCPS whose output phase saturates as the phase control input exceeds some value. The circular VCPS is based on a vector modulation method whose modulation signals are generated in a pseudo-sinusoidal way exploiting the current-voltage (I-V) curve of a MOS differential amplifier pair. When the circular VCPS is employed in phase tracking loops, the loop can operate in a stand-alone way thanks to its unlimited phase shifting capability.
Keywords :
differential amplifiers; modulation; phase shifters; MOS differential amplifier; circular voltage-controlled phase shifter; current-voltage curve; modulation signals; output phase shift; phase control input; phase shifting capability; phase tracking loops; pseudo-sinusoidal way; unlimited phase range; vector modulation method; Baseband; Control systems; Differential amplifiers; Phase control; Phase locked loops; Phase modulation; Phase shifters; RF signals; Tracking loops; Voltage control;
Conference_Titel :
Circuit Theory and Design, 2007. ECCTD 2007. 18th European Conference on
Conference_Location :
Seville
Print_ISBN :
978-1-4244-1341-6
Electronic_ISBN :
978-1-4244-1342-3
DOI :
10.1109/ECCTD.2007.4529662
