Stillness and Light: The Silent Eloquence of Shaker by Henry Plummer

By Henry Plummer

Shaker constructions have lengthy been prominent for his or her simplicity of layout and durable craftsmanship, with shape continuously following functionality. through the years, their particular actual features have invited as a lot examine as imitation. Their fresh, unadorned traces were stated to mirror middle Shaker ideals akin to honesty, integrity, purity, and perfection. during this ebook, Henry Plummer specializes in using usual mild in Shaker structure, noting that Shaker developers manipulated mild not just for functional purposes of illumination but additionally to sculpt a intentionally religious, visible presence inside their house. Stillness and light-weight celebrates this subtly appealing element of Shaker innovation and development, captured in additional than a hundred gorgeous images.

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The clock frequency is 450 MHz, power consumption is 18 W, and the phase accumulator width (j) is 28. The chirp rate is perfect except that there is always a level of quantization. 2). Another problem is the LPF group delay, especially at the high end of the band. If this becomes important in the application, a phase equalizer needs to be added to compensate for the filter group delay. 6 DDS Power Consumption an d Spurious Level Although the DDSs were invented decades ago [Tie71] they did not come to play a dominant role in wideband frequency generation until recently.

The output of the DDS is a pure sine wave in the above case. 8 DDS Power Consumption vs. Output Bandwidth. Data points based on references [Bel00], [QuS91], [Ana94], [Mad99], [NiB94], [Chapter 9], [Chapter 10], [Tan95a], [Mor99], [SaA94], [Tan95b], [Sau90], [Sci94], [Sta94]. 1 (see Appendix D) shows different recently reported DDS ICs. A comparison is difficult because it does not include other signal processing capabilities that these circuits have. These properties increase power consumption and area compared with the ’standard DDS’.

10. Glitch impulse and settling time. carrier-to-spur level is unchanged and only the position of the spurs has been permutated. 4 D/A-Converter Errors In high-speed and high-resolution (>10 bits, >50 MHz) DDSs, most of the spurs are generated less by digital errors (truncation or quantization errors), and more by analog errors in the D/A converter and the lowpass filter such as clock feedthrough, intermodulation, and glitch energy. The specifications of the D/A-converter are studied in detail because the D/A-converter is the critical component.

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