Calibration techniques in nyquist A/D converters

In modern systems signal processing is performed in the digital domain. Contrary to analog circuits, digital signal processing offers more robustness, programmability, error correction and storage possibility. The trend to shift the A/D converter towards the input of the system requires A/D converters with more dynamic range and higher sampling speeds. This puts extreme demands on the A/D converter and potentially increases the power consumption. Calibration Techniques in Nyquist A/D Converters analyses different A/D-converter architectures with an emphasis on the maximum achievable power efficiency. It is shown that in order to achieve high speed and high accuracy at high power efficiency, calibration is required. Calibration reduces the overall power consumption by using the available digital processing capability to relax the demands on critical power hungry analog components. Several calibration techniques are analyzed. The calibration techniques presented in this book are applicable to other analog-to-digital systems, such as those applied in integrated receivers. Further refinements will allow using analog components with less accuracy, which will then be compensated by digital signal processing. The presented methods allow implementing this without introducing a speed or power penalty

A full-band multi-standard global analog digital car radio SoC with a single fixed-frequency PLL

This paper presents a wideband car radio SoC for global multi-standard and multi-channel analog and digital broadcast radio. One of the major challenges of a wideband receiver is that the RF circuits and A/D converters need to have very high in-band IIP3 while the receiver NF should be low. These IIP3 and NF requirements are difficult to meet simultaneously. Key techniques to achieve low noise and very high linearity are high gain-bandwidth multi-inverter-based amplifiers supplied by PVT-tracking low-ohmic low dropout regulators, very linear high-speed 1-bit ΔΣ ADCs and a mixerless wideband AM front-end architecture. In FM mode the measured in-band IIP3 is 17.5dBm at a NF of 6dB. At maximum gain the NF is 4.1dB in DAB mode