Abstract
Smart materials usually need a control system to
accomplish the smart behavior. A widely used control
system principle is analog or digital feedback control.
Smart material applications benefit from short control
latency, and an analog controller usually has the
shortest possible processing delay. Its drawback is the
lack of flexibility for adjustable or adaptive solutions.
For this purpose digitally adjustable analog controllers
can be used. They can be implemented in various ways.
Implementation in this study focuses to the Field
Programmable Analog Array (FPAA), which is based on
switched capacitor technology. With FPAAs not only the
filter parameters are digitally adjustable but the filter
structure may be modified during the operation. With
these properties FPAAs can be used as low latency
feedback controllers. Base filter structures in FPAAs are
often rudimentary, such as biquad filters, but they can
be cascaded for more complex arrangements. An FPAA
realisation of a controller is presented. Moreover, the
developed feedback controller is evaluated in an active
noise control test setup. The results show that the FPAAs
can be successfully used in feedback control
applications. However, the switched capacitor technology
sets limits to performance of practical controller due to
the switching noise and the clock feed-through in
practical implementations, and implications of this are
also discussed.
Original language | English |
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Title of host publication | Forum Acusticum 2005 Conference Proceedings (on CD-ROM). Budapest, HU, 29 Aug. - 2 Sept. 2005 |
Publisher | European Acoustics Association (EAA) |
Number of pages | 4 |
Publication status | Published - 2005 |
MoE publication type | A4 Article in a conference publication |
Event | Forum Acusticum 2005: 4th European Congress on Acoustics - Budapest, Hungary Duration: 29 Aug 2005 → 2 Sep 2005 |
Conference
Conference | Forum Acusticum 2005: 4th European Congress on Acoustics |
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Country/Territory | Hungary |
City | Budapest |
Period | 29/08/05 → 2/09/05 |
Keywords
- active noise control
- control electronics
- local feedback controller
- FPAA
- Field Programmable Analog Array
- switched capacitor
- biquad