Abstract: |
The present invention pertains to the field of the design technology of wireless communication system transceiver chip. The characteristics reside in that: the novel back-to-back series connected type MOS varactor adopting the digital signal control forms the main hypercap part of the numerical controlled LC oscillator, and the phase noise converted from the amplitude noise from the oscillator is reduced, and the restraining ability of the oscillator to the noise from the current source is improved, thus, the phase noise of the output signal of the oscillator is finally reduced. The method in the present invention, comparing with the prior method, can improve the performance of the on-piece CMOS oscillator and reduce the power consumption of the oscillator effectively, thus, the method is useful to the reduction of the manufacturing cost and power consumption of the receiver. |