By Paulo G.R. Silva, Johan H. Huijsing
High-Resolution IF-to-Baseband SigmaDelta ADC for automobile Radios addresses the speculation, process point layout and circuit implementation of a high-resolution continuous-time IF-to-baseband quadrature SigmaDelta ADC. the objective software of this ADC is in AM/FM/IBOC automobile radios. The ADC achieves a dynamic variety of 118dB, which removes the necessity for an IF VGA or AM channel clear out in vehicle radios. the writer is particularly popular in the Analog Circuits neighborhood.
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Extra resources for High-Resolution IF-to-Baseband SigmaDelta ADC for Car Radios (Analog Circuits and Signal Processing)
3 Anti-alias Filtering Generally, oversampled ADCs have much less stringent anti-aliasing requirements than Nyquist-rate ADCs . However, switched-capacitor Σ∆ modulators implementations still require a low-order anti-aliasing filter. For this class of modulators, the sampling operation takes place before the input summing node. As shown in Figure 3-1, in continuous-time Σ∆ modulators, the sampling occurs after the loop filter. Therefore, the quantizer input signal is filtered and all sampling non-idealites inside the signal band are attenuated.
A hybrid AM-IBOC channel is shown in Figure 2-25b. Again OFDM and FEC coding are used for the primary (P) and secondary (S) digital audio sidebands. Because the analog information is amplitude modulated, some terciary (T) digital information is transmitted as a quadrature-phase component of the analog broadcasting. However, due to non-satisfactory performance caused by strong adjacent channel interferers, hybrid AM-IBOC is yet to be adopted . Both FM and AM IBOC standards are prepared for transition to full digital broadcasting, if and when the analog broadcasting is shut-down.
An efficient way to improve the resolution of a Σ∆ modulator is to increase the order of the modulator. Each increment of the modulator’s order theoretically translates to an extra 20dB/dec attenuation of the quantization noise within the bandwidth of interest. However, high-order modulators can be unstable. 2 Single-bit Σ∆ modulators of any order are also prone to exhibit a tonal behaviour. 3, it is shown how circuit non-idealites, together with the presence of tones, may limit the actual performance of a Σ∆ ADC.