By Thorsten Baumheinrich, Bernd Prégardier, Ulrich Langmann (auth.), Rudy J. van de Plassche, Hohan H. Huijsing, Willy Sansen (eds.)
`The authors are to be complimented for gathering, right into a unmarried reference, loads of attention-grabbing info on the topic of the above pointed out issues, quite precious for data-acquisition approach designers, RF engineers, and others.'
Microelectronics magazine 29 (1998) 1039-1046
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Extra resources for Analog Circuit Design: RF Analog-to-Digital Converters; Sensor and Actuator Interfaces; Low-Noise Oscillators, PLLs and Synthesizers
_. L. _. - _. L. _. _. _. - o -:-- ; J_ -2 --! ; 1 o 1024 Fig. 13. Measured INL at 50-Ms/s and 12-MHz input frequency. Measured DNL and INL from the stand alone version is shown in Fig. 12 and Fig. 13 respectively. 6-LSB's is achieved while using (almost) minimum size transistors throughout the design. 7-bits. As this figure shows, ENOB is virtually independent of signal frequency, up to at least 12-MHz. 0 (MHz) -----.. 0 Fig. 14. Measured SNDR and ENOS versus input frequency at 48-Ms/s, taken from the stand-alone version.
F 10 bits digital thermometer to binary decoding Fig. 1. Amplifiers preceding the comparators in a flash-converter. 51 decoding Fig. 2. Averaging resistors added to the outputs of the pre-amps. This is due to the inherent dynamic behavior of comparators. Clock signals are fed into the comparator and large (digital) swings appear at the output. Although the 5x improvement in offset is significant, it is still not sufficient for our goal here and an averaging technique is proposed to further reduce the effects of offsets.
Fig. 4. The effect of averaging. ~ 53 -1 ~ Fig. 5. Improved implementation of averaging. (indicated by the grey dots), a random pattern around the ideal behavior results (the grey line between the grey dots). In the plot, the output impedance of each individual amplifier is indicated by a resistor between the grey and the black dot. The black dot indicates the result after averaging. The averaging resistors are illustrated between the black dots. As can be seen from this picture, lowering the averaging resistors will pull the curve on to a straight line, as was found in .
Analog Circuit Design: RF Analog-to-Digital Converters; Sensor and Actuator Interfaces; Low-Noise Oscillators, PLLs and Synthesizers by Thorsten Baumheinrich, Bernd Prégardier, Ulrich Langmann (auth.), Rudy J. van de Plassche, Hohan H. Huijsing, Willy Sansen (eds.)