By Bodhisatwa Sadhu, Ramesh Harjani
This ebook makes a speciality of the structure and circuit layout for cognitive radio receiver front-ends. The authors first supply a holistic clarification of RF circuits for cognitive radio structures. this is often through an in-depth exploration of current strategies that may be used by circuit designers. assurance additionally comprises novel circuit innovations and architectures that may be useful for designers for cognitive radio systems.
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Additional resources for Cognitive Radio Receiver Front-Ends: RF/Analog Circuit Techniques
The corresponding clock phases used are shown in Fig. 9. The latch performs offset cancellation and switched-capacitor based common-mode feedback during the CRAFT sampling and processing phases (φAZ ), and latches the CRAFT output with a 10τ settling accuracy during the next 32 clock phases (φL ). The output is then held (φH ) until the external measurement system reads the outputs. Thirty-two (16×2 for real and imaginary) of these latches capture the FFT output Fig. 12. 4 Circuit Non-Idealities and Mitigation Analog buffers 5 Φcore State m/c 2 State m/c 1 on-chip handshake FPGA (NI-7811R) LabVIEW® Fig.
9 Timing diagram showing the clock, trigger, sampling, processing, reset, and output latch clocks Φ IN+ Φ Φ W Cs IN+ 2W 2W Cs IN+ W W Cs W Cs Φ IN− Cs W IN− Φ a Cs 2W 2W IN− W Φ b Φ c Fig. 10 The improved sampler (c), compared with 2 traditional samplers (a), (c) Fig. 10b . However, to maintain the same on-resistance, power consumption increases by more than 4X and the total parasitic loading of the input driver increases. In comparison, the improved sampler configuration (Fig. 10c) uses matched cross-coupled feedthrough paths from the differential inputs to cancel the capacitive signal feed-through at the output node without any additional switching or active power consumption.
This generates the proper noise correlation that, averaged over multiple simulations, provides the expected output-referred noise power. Mitigation Noise in the later stages of the CRAFT engine is reduced due to copy averaging among four copies of each output to reduce the noise power by 4. Moreover, correlation ρ among copies is exploited for noise reduction by averaging before the latching operation. 1. The attenuation (Av,out ) reduces the output-referred noise by A2v,out . 9 dBFS). 2 Noise sources Vn2 per copy Av,out ρout Pn,out = Sampler (4-copy) 2pt.