Timing recovery for digital receiver with interleaved analog-to-digital converters
A receiver having analog to digital converters with phase adjustable sampling clocks. A first analog to digital converter converts an analog signal into first digital samples under control of a first sampling clock. A first clock generator adjusts a phase of the first sampling clock based on at least one first phase control signal. A second analog to digital converter converts the analog signal into second digital samples under control of a second sampling clock. A second clock generator adjusts the phase of the second sampling clock based on at least one second phase control signal. A data decision circuit recovers data based on the first and second samples. Feedback circuitry receives the recovered data and generates at least one first phase control signal for the first clock generator and generates at least one second phase control signal for the second clock generator based on the first phase control signal.
1. A receiver comprising:
a first analog to digital converter (ADC) circuit to convert an analog input signal into first digital samples;
a second ADC circuit to convert the analog input signal into second digital samples;
a finite impulse response filter to generate filtered samples based on the first digital samples and the second digital samples,
a decision circuit to recover data based on the filtered samples; and
circuitry to receive the filtered samples and to generate one or more control signals affecting operation of at least one of the first ADC or second ADC based on the filtered samples.
2. The receiver of claim 1 , wherein the one or more control signals include a first control signal affecting a sampling phase of the first ADC and second signal control signal affecting a sampling phase of the second ADC.
3. The receiver of claim 1 , wherein the circuitry generates the one or more control signals further based on the recovered data.
4. The receiver of claim 1 , wherein the circuitry comprises:
a timing error detector circuit to generate, based on the recovered data, one or more timing error signals indicative of a timing error in sampling of the analog input signal,
wherein the circuitry generates the one or more control signals further based on the one or more timing error signals.
5. The receiver of claim 1 , wherein a sampling phase of the first ADC circuit is different from a sampling phase of the second ADC circuit.
6. A method of operation of a receiver, comprising:
converting an analog input signal into first digital samples with a first analog to digital converter (ADC);
converting the analog input signal into second digital samples with a second ADC;
generating filtered samples based on the first digital samples and the second digital samples;
recovering data based on the filtered samples; and
generating one or more control signals affecting operation of at least one of the first ADC or second ADC based on the filtered samples.
7. The method of claim 6 , wherein the one or more control signals include a first control signal affecting a sampling phase of the first ADC and a second control signal affecting a sampling phase of the second ADC.
8. The method of claim 6 , wherein the one or more control signals are generated further based on the recovered data.
9. The method of claim 6 , further comprising:
generating, based on the recovered data, one or more timing error signals indicative of timing error in sampling of the analog input signal,
wherein generating the one or more second control signals is further based on the one or more timing error signals.