Low noise, high linearity double-balanced active mixers using lossless feedback
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چکیده
performance while requiring a considerably less LO power than is required of Class III diode ring mixers having comparable performance [6]. However, the topology has provided little improvement in the NF of earlier active mixer topologies. In the lossless feedback active mixer, an input IF (or RF) signal having amplitude A and frequency ω S is applied differentially to the input terminals of a pair of lossless feedback transformers T 3 and T 4 , which results in a pair of differential input currents
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High dynamic range double-balanced active mixers using lossless feedback
The second term in the denominator of (5) represents the nonlinear emitter resistance of the amplifying transistors Q 3 and Q 6 , which is the primary source of IMD in the doubleAbstract A further development in the application of negative feedback techniques to active double-balanced mixers is described, in which the concept of single-transformer lossless feedback is employed to improve both t...
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