| 摘要 |
A voltage controlled oscillator comprises first and second voltage controlled oscillator cores for generating I and Q quadrature components respectively. Each of the voltage controlled oscillator cores comprises an inductor. A connecting member is electrically coupled to each of said inductors, thereby forcing the same common mode level in the I and Q core of the VCO. The invention has the advantage of providing a simple method of ensuring that the same common mode level is used in the I and Q cores of a cross-coupled VCO, and is particularly advantageous at high operating frequencies. The invention also has the advantage of overcoming potential start up issues, and reduces the sensitivity to device mismatch effects which become more apparent when designing in small geometry processes such as 130nm CMOS, as the smaller device sizes can often result in greater mismatches. |
