Outdoor unit resonator correction

Abstract

A system comprises a microwave backhaul outdoor unit having a first resonant circuit, phase error determination circuitry, and phase error compensation circuitry. The first resonant circuit is operable to generate a first signal characterized by a first amount of phase noise and a first amount of temperature stability. The phase error determination circuitry is operable to generate a phase error signal indicative of phase error between the first signal and a second signal, wherein the second signal is characterized by a second amount of phase noise that is greater than the first amount of phase noise, and the second signal is characterized by a second amount of temperature instability that is less than the first amount of temperature instability. The phase error compensation circuitry is operable to adjust the phase of a data signal based on the phase error signal, the adjustment resulting in a phase compensated signal.

What is claimed is: 
     
         1 - 20 . (canceled) 
     
     
         21 . A system comprising:
 a first signal source operable to generate a first signal comprising a phase distortion, a first phase noise and a first temperature instability; and   phase error compensation circuitry operable to generate a phase compensated signal according to a phase error between the first signal and a second signal, wherein the second signal comprises a second phase noise and a second temperature instability, and wherein the second phase noise is greater than the first phase noise, and wherein the second temperature instability is less than the first temperature instability   
     
     
         22 . The system of  claim 21 , wherein the system comprises an interface operable to receive the second signal from a microwave backhaul unit. 
     
     
         23 . The system of  claim 21 , wherein the system comprises a local oscillator operable to generate the second signal. 
     
     
         24 . The system of  claim 21 , wherein the first signal source is a surface acoustic wave resonator. 
     
     
         25 . The system of  claim 21 , wherein the first signal source is a bulk acoustic wave resonator. 
     
     
         26 . The system of  claim 21 , wherein the first signal source is a crystal oscillator. 
     
     
         27 . The system of  claim 21 , wherein the system is operable to process a received signal according to the phase compensated signal. 
     
     
         28 . The system of  claim 21 , wherein the system is operable to process a signal for transmission according to the phase compensated signal. 
     
     
         29 . The system of  claim 21 , wherein the phase error compensation circuitry comprises:
 frequency divider circuitry operable to divide the first signal by a determined ratio to generate a third signal; and   signal processing circuitry operable to generate the phase error based on a phase difference between the second signal and the third signal.   
     
     
         30 . The system of  claim 29 , wherein the phase error compensation circuitry comprises a delta sigma modulator operable to control the determined ratio based on the phase error. 
     
     
         31 . The system of  claim 21 , wherein the phase error compensation circuitry comprises:
 multiplier circuitry operable to multiply a frequency of the phase error signal by a determined ratio to generate a compensation signal; and   summer circuitry operable to sum the first signal and the compensation signal to generate the phase compensated signal.   
     
     
         32 . The system of  claim 31 , wherein the determined ratio is the ratio of the frequency of the first signal to the frequency of the second signal. 
     
     
         33 . The system of  claim 21 , wherein phase error compensation circuitry comprises a phase locked loop. 
     
     
         34 . The system of  claim 21 , wherein the phase error compensation circuitry is operable to upconvert the phase compensated signal prior to a data transmission. 
     
     
         35 . The system of  claim 21 , wherein the system is operable to transmit the phase compensated signal over a coaxial cable. 
     
     
         36 . The system of  claim 21 , wherein the second signal is a second phase compensated signal received from a microwave backhaul unit. 
     
     
         37 . The system of  claim 36 , wherein the system is communicatively coupled to the microwave backhaul unit via a coaxial cable. 
     
     
         38 . The system of  claim 21 , wherein the system comprises a frequency synthesizer operable to generate the second signal based on the first signal. 
     
     
         39 . The system of  claim 21 , wherein a frequency synthesizer is operable to adjust a phase of the second signal based on the phase error to generate a phase compensated reference signal. 
     
     
         40 . The system of  claim 39 , wherein the frequency synthesizer is operable to generate a microwave frequency local oscillator signal based on the phase compensated reference signal.