Circuits and methods for generating oscillating signals

摘要

Embodiments of the present invention may be used to generate oscillating signals. One embodiment of the present invention includes a circuit that receives a differential signal to be divided. The circuit converts the differential signal into an injection signal. The injection signal is coupled to an oscillator, and the oscillator generates an output signal having a frequency that is a fraction of the frequency of the differential input signal. In another embodiment, the present invention includes a MIMO wireless communication system. The MIMO system may use the divider circuit to divide a local oscillator signal with reduced common mode distortion.

主权项

1. A signal-repeating circuit comprising:
a common-gate amplifier circuit comprising:
a first pair of transistors having respective gates that are coupled together, respective sources at which a first differential current signal having a first frequency is received, and respective drains at which a first differential voltage signal having the first frequency is provided;a tuned inductive-capacitive load coupled to the respective drains of the first pair of transistors effective to enable conversion of the first differential current signal to the first differential voltage signal; a frequency divider coupled to the respective drains of the first pair of transistors and configured to provide, based on the first differential voltage signal having the first frequency, a second differential voltage signal having a second frequency for use in signal processing; and a voltage-to-current transconductance stage comprising:
a second pair of transistors having respective gates that are each coupled to one of the respective drains of the first pair of transistors to receive the first differential voltage signal having the first frequency, respective sources that are coupled together, and respective drains at which a second differential current signal having the first frequency is provided; anda current sink coupled to the sources of the second pair of transistors effective to enable conversion of the first differential voltage signal having the first frequency to the second differential current signal having the first frequency.