A 5-㎓ Band CCNF VCO Having Phase Noise of -87 ㏈c/㎐ at 10㎑ Offset

In this paper, we present a new current-current negative feedback(CCNF) differential voltage-controlled oscillator (VCO) with l/f induced low-frequency noise suppressed, By means of the CCNF. the 1/f induced low-frequency noise is removed from the proposed CCNF VCO Also, high-frequency noise is stopped from being down-converted into phase noise by means of the increased output Impedance through the CCNF and the feedback capacitor Cf The proposed CCNF VCO represents 11-dB reduction in phase noise at 10 ㎑ offset, compared with the conventional differential VCO The phase noise of the proposed CCNF VCO is measured as -87 ㏈c/㎐ at 10 ㎑ offset frequency from 5.5-㎓ carrier The proposed CCNF VCO consumes 14.0 ㎃ at 2.0 V supply voltage, and shows single-ended output power of - 12 ㏈m