Transposed delay line oscillator and method

A method of suppressing phase noise in a transposed delay line oscillator, the method comprising:

• generating a mode selection signal at a reference frequency in a Radio Frequency (RF) band, the mode selection signal having a frequency response including an oscillatory mode;
• transposing the mode selection signal with a transposition signal to generate a transposed mode selection signal at an intermediate frequency;
• delaying the transposed mode selection signal by-based on a time delay to generate a delayed mode selection signal, wherein a phase of the delayed mode selection signal is de-correlated from a phase of the transposition signal;
• phase shifting the delayed mode selection signal to generate a phase noise suppressed mode selection signal based on:
• detecting a phase difference between the transposed mode selection signal and a previous phase noise suppressed mode selection signal;
• generating a new total phase difference based on accumulating the detected phase difference with a previous total phase difference, and
• phase shifting the delayed mode selection signal based on the new total phase difference;
• transposing the phase noise suppressed mode selection signal with a transposition signal to generate a transposed delay line output at the reference frequency, wherein the transposed delay line output is coupled to a mode selection filter for use in generating the mode selection signal.

A method of suppressing phase noise in a transposed delay line, the method comprising:

• transposing a Radio Frequency (RF) signal with a transposition signal to generate a transposed mode selection signal at an intermediate frequency;
• delaying the transposed RF signal based on a time delay to generate a delayed RF signal, wherein a phase of the delayed RF signal is de-correlated from a phase of the transposition signal;
• phase shifting the delayed RF signal to generate a phase noise suppressed RF signal based on:
• detecting a phase difference between the transposed mode selection signal and a previous phase noise suppressed RF signal;
• generating a new total phase difference based on accumulating the detected phase difference with a previous total phase difference, and
• phase shifting the delayed RF signal based on the new total phase difference;
• transposing the phase noise suppressed RF signal with a transposition signal to generate a transposed delay line output in an RF band, wherein the RF signal is based on the transposed delay line output.