System and method for clock jitter compensation in direct RF receiver architectures

A method for processing a radio frequency (RF) input signal, comprising:

• combining a radio frequency (RF) input signal with an injected calibration tone having known characteristics to produce a combined signal including the RF input signal and the calibration tone;
• bandpass sampling the combined signal according to a sampling clock to produce a bandpass sampled digital signal, the sampling clock including associated source clock jitter phase modulation Θ(t) that induces a first jitter phase modulation M1Θ(t) on the calibration tone and a second jitter phase modulation M2Θ(t) on the RF input signal of the digital signal such that received signals of all frequencies have the same induced second jitter phase modulation M2Θ(t) within a common Nyquist zone;
• and
• using the known characteristics of the calibration tone to estimate the induced first jitter phase modulation M1Θ(t) on the calibration tone and to identify and compensate for the source clock jitter phase modulation Θ(t) in the bandpass sampled digital signal based on the estimated induced first jitter phase modulation M1Θ(t) where the induced first jitter phase modulation is M1Θ(t) having a first integer modulation scale factor M1, where the induced second jitter phase modulation is M2Θ(t) having a second integer modulation scale factor M2.

Receive path circuitry, comprising:

• combiner circuitry configured to combine a radio frequency (RF) input signal with an injected calibration tone having known characteristics to produce a combined output signal including the RF input signal and the calibration tone;
• bandpass sampling receiver circuitry coupled to receive the combined output signal from the combiner circuitry, the bandpass sampling receiver circuitry configured to receive a sampling clock and to sample the combined output signal using the sampling clock to produce a digital output signal, the sampling clock including associated source clock jitter phase modulation Θ(t) that induces a first jitter phase modulation M1Θ(t) on the calibration tone and a second jitter phase modulation M2Θ(t) on the RF input signal of the digital output signal from the bandpass sampling receiver circuitry such that received signals of all frequencies have the same induced second jitter phase modulation M2Θ(t) within a common Nyquist zone;
• and
• processing circuitry coupled to receive and process the digital output signal from the bandpass sampling receiver circuitry by using the known characteristics of the calibration tone to estimate the induced first jitter phase modulation M1Θ(t) on the calibration tone and to identify and compensate for the source clock jitter phase modulation Θ(t) in the digital output signal from the bandpass sampling receiver circuitry based on the estimated induced first jitter phase modulation M1Θ(t);
• where the induced first jitter phase modulation is M1Θ(t) having a first integer modulation scale factor M1, and where the induced second jitter phase modulation is M2Θ(t) having a second integer modulation scale factor M2.

A method for processing a radio frequency (RF) input signal, comprising:

• combining a radio frequency (RF) input signal with an injected calibration tone having known characteristics to produce a combined signal including the RF input signal and the calibration tone;
• filtering the combined signal with a tunable bandpass filter to produce a filtered combined signal;
• bandpass sampling the filtered combined signal according to a sampling clock to produce a bandpass sampled digital signal, the sampling clock including associated source clock jitter phase modulation Θ(t) that induces a first jitter phase modulation M1Θ(t) on the calibration tone and a second jitter phase modulation M2Θ(t) on the RF input signal of the bandpass sampled digital signal such that received signals of all frequencies have the same induced second jitter phase modulation M2Θ(t) within a common Nyquist zone;
• and
• using the known characteristics of the calibration tone to estimate the induced first jitter phase modulation M1Θ(t) on the calibration tone and to identify and compensate for the source clock jitter phase modulation Θ(t) in the bandpass sampled digital output signal based on the estimated induced first jitter phase modulation M1Θ(t);
• where the induced first jitter phase modulation is M1Θ(t) having a first integer modulation scale factor M1, and where the induced second jitter phase modulation is M2Θ(t) having a second integer modulation scale factor M2.

Receive path circuitry, comprising:

• bandpass sampling receiver circuitry configured to receive a sampling clock and to sample a combined radio frequency (RF) signal using the sampling clock to produce a digital output signal, the combined RF signal including a RF input signal and an injected calibration tone, the calibration tone having known characteristics, and the sampling clock including associated source clock jitter phase modulation Θ(t) that induces jitter phase modulation M1Θ(t) having a first modulation scale factor M1 on the calibration tone and jitter phase modulation M2Θ(t) having a second modulation scale factor M2 on the RF input signal of the digital output signal from the bandpass sampling receiver circuitry;
• and
• processing circuitry coupled to receive and process the digital output signal from the bandpass sampling receiver circuitry by using the known characteristics of the calibration tone to estimate the induced jitter phase modulation M1Θ(t) on the calibration tone and to identify and compensate for the source clock jitter phase modulation Θ(t) in the digital output signal from the bandpass sampling receiver circuitry based on the estimated induced jitter phase modulation M1Θ(t);
• wherein the processing circuitry is configured to:
• estimate the induced jitter phase modulation M1Θ(t) on the calibration tone in the digital output signal based on the known characteristics of the calibration tone,
• estimate the source clock jitter phase modulation Θ(t) based on the estimated induced jitter phase modulation M1Θ(t) on the calibration tone in the digital output signal,
• estimate the induced jitter phase modulation M2Θ(t) on the RF input signal based on the estimated source clock jitter phase modulation Θ(t),
• compute a de-jitter phase modulation function based on the estimated induced jitter phase modulation M2Θ(t) on the RF input signal,
• compute a complex baseband representation of the digitized RF input in the digital output signal from the bandpass sampling receiver circuitry, and
• apply the computed de-jitter phase modulation function to the computed complex baseband representation to produce a de-jittered complex baseband representation of the RF input signal for which the source clock jitter phase modulation Θ(t) has been compensated.

A method for processing a radio frequency (RF) input signal, comprising:

• combining a radio frequency (RF) input signal with an injected calibration tone having known characteristics to produce a combined signal including the RF input signal and the calibration tone;
• bandpass sampling the combined signal according to a sampling clock to produce a bandpass sampled digital signal, the sampling clock including associated source clock jitter phase modulation Θ(t) that induces jitter phase modulation M1Θ(t) having a first modulation scale factor M1 on the calibration tone and jitter phase modulation M2Θ(t) having a second modulation scale factor M2 on the RF input signal of the digital signal;
• and
• using the known characteristics of the calibration tone to estimate the induced jitter phase modulation M1Θ(t) on the calibration tone and to identify and compensate for the source clock jitter phase modulation Θ(t) in the bandpass sampled digital signal based on the estimated induced jitter phase modulation M1Θ(t);
• where the method further comprises:
• estimating the induced jitter phase modulation M1Θ(t) on the calibration tone in the bandpass sampled digital signal based on the known characteristics of the calibration tone,
• estimating the source clock jitter phase modulation Θ(t) based on the estimated induced jitter phase modulation M1Θ(t) on the calibration tone in the bandpass sampled digital signal,
• estimating the induced jitter phase modulation M2Θ(t) on the RF input signal based on the estimated source clock jitter phase modulation Θ(t),
• computing a de-jitter phase modulation function based on the estimated induced jitter phase modulation M2Θ(t) on the RF input signal,
• computing a complex baseband representation of the digitized RF input in the bandpass sampled digital, and
• applying the computed de-jitter phase modulation function to the computed complex baseband representation to produce a de-jittered complex baseband representation of the RF input signal for which the source clock jitter phase modulation Θ(t) has been compensated.