Title :
A noise rejective VCO with build-in active LC filter
Author :
Zhuo, Ma ; Yang, Guo ; Lunguo, Xie ; Rongrong, Liu ; Hongjian, Zuo
Author_Institution :
Comput. Sch., Nat. Univ. of Defense Technol., Changsha, China
Abstract :
VCO is the key component in PLLs, and is easy to be interfered by the noise on control voltage or power supply. In this article, a build-in LC filter is inserted into a single-end VCO which is named BF-VCO. The LC filter consists of a regulated cascode active inductor and a capacitor. And the low-pass bandwidth is not greater than 1.6MHz. The measurement spectrum shows that the noise received by the succeeding ring oscillator is attenuated for about 20dB, while the white noise floor changes little.
Keywords :
active filters; capacitors; inductors; low-pass filters; voltage-controlled oscillators; BF-VCO; PLL; build-in active LC filter; capacitor; control voltage; low-pass bandwidth; noise rejective VCO; power supply; regulated cascode active inductor; ring oscillator; single-end VCO; white noise floor; Clocks; Noise; Noise measurement; Power measurement; Switches; Transforms; Voltage-controlled oscillators; LC filter; VCO; active inductor; regulated cascode; spectrum;
Conference_Titel :
ASIC (ASICON), 2011 IEEE 9th International Conference on
Conference_Location :
Xiamen
Print_ISBN :
978-1-61284-192-2
Electronic_ISBN :
2162-7541
DOI :
10.1109/ASICON.2011.6157276
