Mixer Circuit for Reducing Phase Noise and Frequency Offset Variance in Local Oscillators

Abstract

Apparatus for improving an operating frequency of an oscillating output signal by averaging deviations of operating frequencies of at least two oscillating input signals. The apparatus comprises electrical circuit(s) adapted to: (a) Mix together, by a mixer circuit, at least a first and a second oscillating input signals. Each of the input signal having a common input operating frequency and the mixed signal having a resultant operating frequency. Each of the input operating frequencies is centered around a common nominal frequency with a frequency deviation and the resultant operating frequency is centered around a multiple of the nominal frequency. (b) Divide, by a divider circuit, the resultant operating frequency of the mixed signal to create an output signal having an operating frequency centered around the nominal frequency with an averaged frequency deviation which is an average of the frequency deviations of the at input signals. (c) Output the output signal.

Description

technical field [0001] The present invention in some of its embodiments relates to reducing the effect of frequency deviation of an oscillating signal, more particularly, but not exclusively, to reducing the effect of frequency deviation of an oscillating signal by averaging the effect of deviation of at least two oscillating input signals, In particular an oscillating input signal and a delayed oscillating signal produced by delaying the oscillating input signal. Background technique [0002] Oscillating signals are fundamental building blocks in a variety of demanding applications, such as reference signals for analog circuits and / or clocks for digital circuits. Such applications may often require an accurate low noise oscillating signal that can be generated with minimal power consumption and remain accurate over a range of frequency and time. [0003] In digital communication systems, especially in wireless communication systems where multiple mobile transceivers commun...

AI Technical Summary

Problems solved by technology

Often timing circuits and / or components such as crystal oscillators, clock generators, etc. are used to provide the required reference frequency, however, the frequency of the generated oscillating signal is prone to drift with time and temperature

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