Patent ID: 6683504
Filing Date: 2004-01-27
Classification: H03B,H03K

Abstract:
An integrated circuit low noise oscillator comprising:a first ring oscillator section for producing a first output signal having a normalized noise factor of 1, the first ring oscillator section having an input to receive an input signal and an output, connected to the input, to supply the first output signal; and at least a second ring oscillator section having an input connected to the input of the first ring oscillator section and an output, connected to the input of the first ring oscillator section and to the input of the second ring oscillator section to supply a second output signal in phase with the input signal; the outputs of the ring oscillator sections are connected to sum the output signals for providing an oscillator output signal having a noise factor of 1/(N)Â½, where N equals the total number of ring oscillator sections.