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Full range voltage-controlled ring oscillator in 0.18μm CMOS for low-voltage operation

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2 Author(s)
Tiao, Y.-S. ; Dept. of Electr. Eng., Nat. Chi Nan Univ., Nantou, Taiwan ; Sheu, M.-L.

A new differential delay cell with a complementary current control to increase the control voltage range as well as the operation frequency is proposed for low-voltage operation. The new differential delay cell is employed in a four-stage voltage-controlled ring oscillator (VCRO). The VCRO is implemented using 0.18 m 1P6M CMOS process and 1.8 V supply voltage. Measured results show that a wide operation frequency range from 5.36 to 3.03 GHz is achieved for the full range control voltage from 0 to 1.8 V. Measured phase noise is 107 dBc/Hz at 1 MHz offset from the 5.22 GHz centre frequency.

Published in:

Electronics Letters  (Volume:46 ,  Issue: 1 )

Date of Publication:

January 7 2010

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