Inductors for stable 2,4 GHZ frequencies
17 July 2002
Passive Components
Murata's thin-film SMD inductors, the LQP15M series, sits on an 0402 footprint and is only 0,35 mm high, ideal for 1,2 to 2,4 GHz Bluetooth modules. Tolerance is ±0,1nH below 10 nH and 2% or 5% at 10 nH and above. This may not seem tight, especially at very low values, but Murata says that accuracy is better than measurement resolution at these levels. In fact, the distribution of inductance value within a lot is narrower than the tolerance. Data available on request.
This accuracy, coupled with thermal stability and high self-resonant frequencies, provides stable inductance in high frequency circuits. With these characteristics and the availability of E24 values, engineers can adjust designs to optimise performance. These chip devices can be flow or reflow soldered, careful land design optimises the achievable Q, and the positional accuracy.
Murata also has available a design kit, referenced EKLM14UC, that contains 20 pieces each of 31 values.
For more information: Avnet Kopp, 011 809 6100, [email protected], www.avnet.co.za
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