Shift registers

CCD shift register showing charge transfer from a phase one well to a phase two well. 

Fig. 11. Cutaway view of a CCD shift register where the ( ) represent gate electrodes. Voltage pulses appHed to the phase gates move photogenerated charge in the charge-transfer direction. The channel stops confine the charge during integration and transfer. See text.

Feedback Shift Registers Feedback shift registers are essentially one-dimensional finite state machines consisting of a linear array of sites i = 1,2. .., n, with each site i carrying value (7. At each time step, the system evolves according to the following... 

Fig, 2.8 Schematic diagram of a length-n feedback. shift register. 

It is easy to see that an elementary size-n one-dimensional CA rule (f) is equivalent to a size-n feedback shift register with a G (0,1, taps at positions n — 2, n — 1 and n, and f 4>. The only difference is that it takes n shift-register time-steps to reproduce a single CA time step. 

Fig. 5.1 Schematic diagram of a length-re feedback shift register.

There is a wealth of research that has been done on shift transformations. One of the best references is Golomb s classic Shift Register Sequences [golom67]. 

Figure 2 Readout pattern of a two-dimensional CCD. The bottom row corresponds to the shift register. Its output is connected to the preamplifier input. (Reproduced by permission, from the Book of Photon Tools, Oriel, Stafford, CT.)...

Gelinck, G. H. et al. 2004. Flexible active-matrix displays and shift registers based on solution-processed organic transistors. Nature Mater. 3 106-110. 

Shift Registers with Submicron Magnetic Bubbles on Epitaxial Garnet Films. Presented at Intermag, Washington, D.C. See also Abstr. 26.5 in Abstr. Dig, for the same conference, 1973. 

This version of the harmonic neutralized sine-wave oscillator uses a series of flip-flop gates, configured as a shift register (supplied by a 74HC174 IC) and an inverter (supplied by a CD4049) to provide the... 

Check weigh of either gross weight, or better tare each primary pack and check weigh with a shift register tracking each individual primary pack Level detection by means of light, x-ray, alpha radiation, etc. 

MLBSs are generated by a shift register of length L with feedback as shown in Fig. 27. The bit position to which the output is added depends on L. Initially, all bits are loaded with 1. At every clock cycle, the register contents is shifted to the right, the rightmost bit is applied to the output and the result of the modulo 2 addition is fed into the leftmost bit. The output sequence is repeated after 2L-l steps. For practical purposes, the elements bj. of the MLBS can be computed from a recursion formula ... 

Fig. 27.3-bit shift register to generate a maximum length binary sequence of length 23-1=7. The summation is modulo 2... 

Fig. 2 HOMO / LUMO scheme for operation of a proposed molecular shift register.1461 The...

Fig. 3 HOMO / LUMO scheme for a modified molecular shift register in which bits are encoded and propagate as free electrons instead of the system based on hole transfer described in Figure 2. Data is encoded by electrochemical reduction of the donor moiety adjacent to the cathode, resulting in the electronic configuration shown in (a). Subsequent stepwise thermal electron transfer...

The imaging array 10 defines a number of rows 16 of CCD bits. Each column of bits in the array is in essence a vertical CCD shift register, where data can be shifted from one bit to the adjacent bit by application of clock pulses from a clock generator. Alternate rows 16 are characterized as optically active, the remaining interlaced rows (such as row 16a) are characterized as optically inactive. The CCD bits in the optically inactive rows are covered by opaque strips. Radiation generated minority carriers are collected alternately from a scene and... 

A problem with imagers adopting the TDI method is that the charge packets in the parallel shift register potential wells increase in size from the first to the last stages and overflow after saturation. This problem is addressed in EP-A-0066020 (Texas Instruments Incorporated, USA, 08.12.82). 

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