Semiconductor Tech. - Manufacturing White Papers
Generating Switched-Capacitor-Filter Clocks
Overview Recent advances in semiconductor-process technology and circuit-design techniques have brought down the prices of switched-capacitor filters (SCFs) by a factor of three. As an example, five-pole Butterworth low-pass filters sell for less than a dollar each in large quantities. Recent SCFs offer low-power single-supply operation down to 2.7V. Implementing an SCF is easy. First, choose the kind. Fixed-response, five- and eight-pole Butterworth, Bessel, Chebyschev, and elliptic (Cauer) types are commonly available, as well as the universal SCF with user-programmable features. Follow the data-sheet recommendations on power supplies, bypassing, and signal coupling, and then select a clock frequency appropriate to the application. Some SCFs are self-clocking with the addition of external components (for example, the MAX280), but most applications use a CMOS-level clock signal to set the SCF's corner frequency. Otherwise, many acceptable methods are available for setting the clock signal for an SCF.
| Publisher | Dallas Semiconductor / Maxim Integrated | File Format | HTML & PDF |
|---|---|---|---|
| Date Published | December 2000 | Downloads | 47 |
| Format | White Papers | ||
| Topics | |||
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