Time Interleaved ADC Series: Interleaved Non-Ideal Factors

Time interleavedADC improves the sampling rate ofADC by using multiple parallel workingADCs. Ignoring the non-ideal factors present in thechannel ADC, there are non-ideal factors such asoffset mismatch, gain mismatch, and timing skew between the interleavedADCs, which causespur in theADC output leading to a decrease inENOB.

Time Interleaved ADC Series: Interleaved Non-Ideal Factors

Assuming thechannel ADC is ideal and ignoring noise factors. 4-way interleaving, channel ADC is 10 bits.

1.Offset mismatch only

Between channels,offset=2.5mV, normally distributed, Monte Carlo points=1000.

Time Interleaved ADC Series: Interleaved Non-Ideal Factors

2.Gain mismatch only

Between channels,gain mismatch=6e-3, normally distributed, Monte Carlo points=1000.

Time Interleaved ADC Series: Interleaved Non-Ideal Factors

3.Timing skew only

Timing skew=5pS, uniformly distributed, Monte Carlo points=1000.

Time Interleaved ADC Series: Interleaved Non-Ideal Factors

Skew causesspur related to the input signal frequency.Skew=5pS.

Time Interleaved ADC Series: Interleaved Non-Ideal Factors

4.All

All of the above3 factors exist simultaneously.

Time Interleaved ADC Series: Interleaved Non-Ideal Factors

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