IEEE Solid-States Circuits Magazine - Winter 2020 - 72

domain and signal processing is done
in the digital domain; these require
bandpass or frequency-translating
delta-sigma converters. To reduce the
number and power of multiple local
oscillators, wide- or multiband ADCs
can be used, so there is much interest
in their development.
The filtering configuration in the
delta-sigma converter can be feedforward, feedback, or both. Any of these

In a mobile
radio receiver,
the strongest
interfering signal
is the onboard
transmitter;
however, it is
also challenging
to reject strong
adjacent channels.

systems may produce identical noiseand signal-shaping characteristics, but
each entails different physical challenges. For example, a feedforward
structure may offer smaller internal
signal swings, so it is less challenging
to maintain linearity. Because analog
elements dominate the analog internal signals in the delta-sigma ADC,
strategic scaling of signals within the
architecture as well as proper choice
of sufficiently linear elements is also
important. Feedforward configurations may cause signal-transfer characteristic peaking, which is more challenging to shape so that out-of-band
signals are sufficiently rejected. Signal- and noise-shaping functions can
be designed with the Schreier toolbox,

72

WINTER 2020

Prof. Maurits Ortmanns giving his lecture "Continuous-Time Delta-Sigma ADCs for Receiver
Application" at the SSCS Lehigh Valley Section.

Ortmanns (fourth from left) with lecture attendees.

and Ortmanns demonstrated some
examples of how to use this toolbox.
One fascinating result that Ortmanns described is the fact that the
filtering function can easily include a
notch to reject the known transmitter
blocking signal. Sampling-clock jitter is
a major problem for continuous-time
delta-sigma converters. The sampling
of out-of-band interferers folds back
into the digitized frequency range.
Moreover, out-of-band harmonics
quantization noise (of the delta-sigma
converter) folds back into the in-band
by way of digital-to-analog converter

IEEE SOLID-STATE CIRCUITS MAGAZINE

phase noise. Once sampling is accomplished, jitter becomes less important
for signal corruption. To deal with
these issues, stronger signal-transferfunction shaping is required. However,
using a filter notch for the transmitter relaxes this requirement, and the
signal-to-noise ratio is improved. Ortmanns's talk was a very detailed and interesting tour of the use of delta-sigma
converters in receivers.
- Angelo Mastrocola and
Richard Booth
IEEE SSCS, Lehigh Valley Section



IEEE Solid-States Circuits Magazine - Winter 2020

Table of Contents for the Digital Edition of IEEE Solid-States Circuits Magazine - Winter 2020

Contents
IEEE Solid-States Circuits Magazine - Winter 2020 - Cover1
IEEE Solid-States Circuits Magazine - Winter 2020 - Cover2
IEEE Solid-States Circuits Magazine - Winter 2020 - Contents
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