J. Hughes and K. Moulding, "An 8MHz, 80Ms/s switched current filter," ISSCC'94, Digest of technical papers, pp.60-61, Feb. 1994  Home/Search   Document Not in Database   Summary   Related Articles   Check

....S D modulator with an optimized system architecture and a current memory cell using a number of techniques to improve the linearity. 2. Improved current memory cell To meet the requirements for high resolution, an improved current memory cell was designed. It is based on the two step approach [4] with a number of additional features (figure 1) An additional branch with a common gate transistor Mcg is used during the coarse acquisition, which forces the input potential to a value close to the quiescent gate potential of Mmp. This maintains the input potential of the cell practically ....

....of the first integrator, and bias currents and transistor sizes have been scaled by a factor of 0.2 in the 2nd and 3rd integrators in order to reduce the total power consumption. Two alternatives were considered for the basic integrator: the standard 3 phase integrator and the 2phase integrator [4,5]. The 2 phase integrator was retained, since it reduces the power consumption at a given performance level. For identical settling times (i.e. same duration of the clock phase) the 2 phase integrator has the advantage of a clock period reduced by 33 . In addition, the signal is sampled only once ....

J. Hughes and K. Moulding, "An 8MHz, 80Ms/s switched current filter," ISSCC'94, Digest of technical papers, pp.60-61, Feb. 1994

....because of the extra manufacturing cost. Analog interfacing circuits that are to be integrated with state of the art digital circuits should therefore preferably not require anything but MOS transistors, and their dynamic range should not be limited by the supply voltage. The current mode approach [1], and the switchedcurrent technique [2] in particular, has been proposed in order to meet these demands. As the signal is represented by currents instead of voltage, the dynamic range is determined by conductance rather than supply voltage. Current mode data conversion and sampled data signal ....

....1. 1 SWITCHED CURRENT TECHNIQUES The switched current (SI) technique for analog signal processing gained interest because of its ability to adapt to the digital VLSI trends, i.e. fine line CMOS processes with low power supply voltages and no extra mask steps for precision analog devices [1 2]. In current mode circuits, signals are represented by currents rather than voltages. Therefore the dynamic range is only indirectly limited by a reduction of the available voltage range. In a traditional voltage mode circuit, the supply voltage imposes a direct limitation on signal swing. ....

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J. B. Hughes, and K. W. Moulding, `An 8MHz, 80MS/s Switched-Current Filter', Proceedings of IEEE Solid-State Circ. Conf., San Francisco, California, pp. 60-61, Feb. 1994, IEEE.

....research groups. Most of them are traditionally based on switched capacitor (SC) or switched current (SI) techniques, and use double sampling techniques, or more specifically, multirate signal processing to relax the specifications of the basic building blocks. Examples can be found in [4] [6] and more recently in [7] The key drivers for such high speed interfaces include video signal processing, particle physics, and magnetic disk read channels. Disk drive applications may be of interest within the field of the decoder in our companion paper [2] Digital interfaces can be ....

J. B. Hughes and K. W. Moulding. "An 8MHz, 80Ms/s switched-current filter," Proc. IEEE Int. Solid-State Circuits Conference ISSCC94, pp. 60--61, 1994.

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