Title :
Design of a low-mismatch gain-boosting charge pump for phase-locked loops
Author :
Mekky, Rania H. ; Dessouky, Mohamed
Author_Institution :
Mentor Graphic Egypt, Cairo
Abstract :
A modified technique to enhance current matching in charge pumps (CP), employed in phase-locked loops, is proposed. In addition to gain-boosting, used to increase the output impedance of the CP, a low-voltage cascode current mirror is used to enhance current matching over process corners. A good matching between the two current sources of the CP can be achieved with current mismatch equals to 0.6% in typical conditions and 1% over all process variations. The CP output compliance voltage range of 0.3-2.2 V is achieved for 2.5-V supply using the I/O devices of a 90-nm technology.
Keywords :
current mirrors; phase locked loops; CP; low-mismatch gain-boosting charge pump; low-voltage cascode current mirror; phase-locked loops; Charge pumps; Impedance; MOS devices; Mirrors; Phase detection; Phase frequency detector; Phase locked loops; Switches; Voltage control; Voltage-controlled oscillators; Charge pump (CP); gain-boosting charge pump; low-voltage cascode current mirror; phase-locked loop (PLL);
Conference_Titel :
Microelectronics, 2007. ICM 2007. Internatonal Conference on
Conference_Location :
Cairo
Print_ISBN :
978-1-4244-1846-6
Electronic_ISBN :
978-1-4244-1847-3
DOI :
10.1109/ICM.2007.4497720
