Correction to “A 1–9 Linear-Wide-Tuning-Range Quadrature Ring Oscillator in 130 nm CMOS for Non-Contact Vital Sign Radar Application” [Jan 10 34-36]

In the above titled letter (ibid., vol. 20, no. 1, pp. 34-36, Jan. 2010), an incorrect version of (3) was published. The correct version is presented here.