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By Joe Weber

Oscilloscope Probe Circuits
Joe Weber

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The principle schematic of such a receiver is depicted in Fig. 4. The “complex” mixer is made out of two mixers which share the same RF input, while the LO port is controlled by two quadrature signals. By adding a 90 delay line in one signal path, the downconverted image signals will be in-phase, while the useful signals will be 180 delayed. Hence, by considering the difference between the two paths the image signal is cancelled, while the useful signal is added. The major advantage of this approach is the antenna filtering becomes less critical.

2/À94 (Band35, QPSK) À117 Specified sensitivity [dBm] À102 32 3 From High-Level Standard Requirements to Circuit-Level Electrical. . 2 Introducing the Minimum SNR for Proper Signal Demodulation 33 The direct conversion architecture (see Fig. 9) downconverts the RF signal directly to the baseband. 1), the signal frequencies after downconversion are also relatively small. Hence, circuits with negative feedback can be used to improve the baseband system linearity. Thus, as detailed in Sect. , [3]).

Moreover, the SDRX of Fig. 13 has the general characteristics specific to a true multi-standard solution. 5 Architectural Evolutions: Filter-Less and Mixer-Less Front-Ends Given the latest trends in ADC dynamic range, sampling speed, and power efficiency improvement [9, 10], the first step in the evolution of Fig. 13 receiver is the elimination of the analog signal conditioning baseband chain, comprised by the LPF and VGA. 14 depicts the filter-less SDRX front-end. 28 2 Defining the Optimal Architecture On–chip LO CLK DIV Control bits Digital Signal Processor Off–chip Fig.

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