principles of sigma delta conversion for analog to digital converters
principles of sigma delta conversion for analog to digital converters
... version ” of a 1-bit delta modulator. The name Sigma- Delta modulator comes from putting the integrator (sigma) in front of the delta modulator. Sometimes, the Σ−∆ modulator is referred to as an in- terpolative ... Modulation from Delta Modulation Block Diagram of Sigma- Delta Modulation S-Domain Analysis of Sigma- Delta Modulator Block Diagram of First-Order S...
Ngày tải lên: 04/07/2014, 07:24
Báo cáo hóa học: " Multistage Quadrature Sigma-Delta Modulators for Reconfigurable Multi-Band Analog-Digital Interface in Cognitive Radio Devices" pot
... [dB] STF TOT ISTF TOT NTF TOT,3 INTF TOT,3 −64 −32 0 32 64 −100 −50 0 Noise (1st) Gain [dB] NTF TOT,1 INTF TOT,1 INTF TOT,2 Figure 8 Three-stage QΣΔM STF and ISTF (top) together with ... [dB] STF TOT ISTF TOT NTF TOT,3 INTF TOT,3 −64 −32 0 32 64 −100 −50 0 Noise (1st) Gain [dB] NTF TOT,1 INTF TOT,1 INTF TOT,2 Figure 9 Three-stage QΣΔM STF and ISTF (top) together with ... becau...
Ngày tải lên: 20/06/2014, 22:20
Báo cáo hóa học: " Research Article Modified Polar Sigma-Delta Transmitter for Multiradio Applications" pptx
... are digital. Therefore, as shown in Figure 1, two Digital -to -Analog Converters (DACs) need to be employed before the upconversion stage. The sampling frequency of DACs is chosen according to the ... reduced by factor of 4 by using an extra parallel resistor R s . This resistor is chosen such that the parallel combination of the dumping resistor R 2 and the resistor R s equa...
Ngày tải lên: 21/06/2014, 11:20
Báo cáo hóa học: "Efficient Realization of Sigma-Delta (Σ-Δ) Kalman Lowpass Filter in Hardware Using FPGA" ppt
... value of the forgetting factor that needs to be used in the full-rate Kalman filter for a given oversampling ratio. Figure 3 shows the filtered error as a function of the number of iterations, for ... selection of the for- getting factor γ. For a second-order modulator, m = 2, it can be shown that using the following values for γ, the Kalman filter would result in the same m....
Ngày tải lên: 22/06/2014, 23:20
Báo cáo hóa học: " Analog-to-Digital Conversion Using Single-Layer Integrate-and-Fire Networks with Inhibitory Connections" potx
... P.M.Aziz,H.V.Sorensen,andJ.V.D.Spiegel, “Anoverview of sigma- delta converters, ” IEEE Signal Processing Magazine, vol. 13, no. 1, pp. 61–84, 1996. [11] B. L. Shoop, Photonic Analog- to- Digital Conversion, Springer Series ... typical scheme for increasing the sampling rate is to use multiple analog- to- digital converters in a mux-demux architecture. The performance of...
Ngày tải lên: 23/06/2014, 01:20
Chapter 5. Principles of Electromechanical Energy Conversion ppsx
... reluctance torque component. The last term in the torque expression, however, is only related to the relative position of the stator and rotor and is independent of the shape of the stator and rotor ... Because of the salient (not round) structure of the rotor, the self inductance of the stator is a function of the rotor position and the first term on the right hand side of...
Ngày tải lên: 11/07/2014, 05:20
Báo cáo hóa học: "Research Article Adaptive Reference Levels in a Level-Crossing Analog-to-Digital Converter" pdf
... condition is met, the sequence of LC samples of x t denotes amplitude changes in the sequence of uniform samples of x t ,henceitcanbemappedtoanequivalent sequence of uniform samples accordingly. Perfect ... updates the set of on comparators. The asynchronous digital circuitry processes the output of the analog circuitry, recognizes the proper times for each of the LCs, t...
Ngày tải lên: 22/06/2014, 01:20