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Viewing report
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Analysis and Design of IF and RF Circuits for SDR
Receivers. Edition No. 1
VDM Publishing House, Sep 2008, Pages: 232
The proliferation of bands and modulation formats
calls for a universal software-defined radio (SDR)
receiver. This digitizes the received waveforms as
soon as possible to relegate most of the
functionality to DSP. In order to use low-cost ADCs,
we envisage the SDR receiver as a signal conditioner
which emphasizes the desired channel and de-
emphasizes the rest. This approach requires clock-
programmable built-in anti-aliasing pre-filters that
attenuate interferers to the extent that ADC can
resolve the wanted signal and residual blockers
without being overloaded. Most of this work is to
design and implement such IF filters. In the rest, a
complete portrait of LC quadrature oscillator (QOSC)
based on injection locking is offered. It is shown
that inserting 90 degrees phase-shifters between the
two oscillator cores of the QOSC results in a single-
mode oscillation with superior phase-noise and
minimum sensitivity to mismatches. Finally, the idea
of progressive multiple-node injection is described
as a method to widen the lock-range of injection-
locked dividers.
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