Quadrature local oscillator phase synthesis and architecture for divide-by-odd-number frequency dividers

A circuit for generating quadrature signals, comprising:

• a frequency divider configured to frequency divide an input signal by an odd number to generate a plurality of frequency-divided signals;
• combination logic configured to logically combine two or more of the plurality of frequency-divided signals to produce:
• a first set of one or more signals having a first magnitude and a first phase;
• and
• a second set of one or more signals having a second magnitude and a second phase;
• and
• selection logic configured to:
• output a first signal having a first integer number of a first member in the first set of signals and a second integer number of a first member in the second set of signals, such that a ratio of the first integer number to the second integer number is approximately equal to a ratio of the second magnitude to the first magnitude;
• and
• output a second signal having the first integer number of a second member in the first set of signals and the second integer number of a second member in the second set of signals, such that the second signal is in quadrature with the first signal over an interval.

An apparatus for wireless communications, comprising:

• a synthesizing circuit for generating a first oscillating signal and a second oscillating signal in quadrature with the first oscillating signal, the synthesizing circuit comprising:
• a frequency divider configured to frequency divide an input oscillating signal by an odd number to generate a plurality of frequency-divided signals;
• combination logic configured to logically combine two or more of the plurality of frequency-divided signals to produce:
• a first set of one or more signals having a first magnitude and a first phase;
• and
• a second set of one or more signals having a second magnitude and a second phase;
• and
• selection logic configured to:
• output the first oscillating signal having a first integer number of a first member in the first set of signals and a second integer number of a first member in the second set of signals, such that a ratio of the first integer number to the second integer number is approximately equal to a ratio of the second magnitude to the first magnitude;
• and
• output the second oscillating signal having the first integer number of a second member in the first set of signals and the second integer number of a second member in the second set of signals, such that the second oscillating signal is in quadrature with the first oscillating signal over an interval;
• a first mixing circuit configured to mix a radio frequency (RF) signal with the first oscillating signal to generate a first frequency converted signal for baseband processing;
• and
• a second mixing circuit configured to mix the RF signal with the second oscillating signal to generate a second frequency converted signal for baseband processing.

A circuit for generating quadrature signals, comprising:

• means for frequency dividing an input signal by an odd number to generate a plurality of frequency-divided signals;
• means for logically combining two or more of the plurality of frequency-divided signals to produce:
• a first set of one or more signals having a first magnitude and a first phase;
• and
• a second set of one or more signals having a second magnitude and a second phase;
• means for outputting a first signal having a first integer number of a first member in the first set of signals and a second integer number of a first member in the second set of signals, such that a ratio of the first integer number to the second integer number is approximately equal to a ratio of the second magnitude to the first magnitude;
• and
• means for outputting a second signal having the first integer number of a second member in the first set of signals and the second integer number of a second member in the second set of signals, such that the second signal is in quadrature with the first signal over an interval.