By Christopher Bowick
RF circuit layout is now extra very important than ever as we discover ourselves in an more and more instant global. Radio is the spine of today’s instant with protocols reminiscent of Bluetooth, wireless, WiMax, and ZigBee. so much, if now not all, cellular units have an RF part and this booklet tells the reader the right way to layout and combine that part in a truly sensible type. This booklet has been up-to-date to incorporate present day built-in circuit (IC) and system-level layout matters in addition to maintaining its vintage "wire lead" fabric.
- Design options and instruments includes:
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187 1 −1 −3 ω ωc −8 ω ωc 2 +1 − 20 ω ωc 3 − 48 ω ωc 4 − 112 ω ωc +5 ω ωc + 18 5 ω ωc 2 ω ωc + 58 −1 3 −7 ω ωc Chebyshev Polynomials to the Order n The attenuation of a Chebyshev ﬁlter can be found by making a few simple but tiresome calculations, and can be expressed as: AdB = 10 log 1 + ε2 Cn2 ω ωc (Eq. 3-7) where FIG. 3-13. Low-pass prototype circuit for Example 3-2. Cn2 at The Chebyshev polynomials for the ﬁrst seven orders are given in Table 3-3. The parameter ε is given by: 0 Attenuation (dB) ω is the Chebyshev polynomial to the order n evaluated ωc ω .
These handy circuits fool the resonant circuit into seeing a source or load resistance that is much larger than what is actually present. 1 dB could present an impedance (Rs ) of 500 ohms to the resonant circuit, when in reality there is an impedance (Rs ) of 50 ohms. Consequently, by utilizing these transformers, both the Q of the resonant tank and its selectivity can be increased. In many cases, these methods can make a previously unworkable problem workable again, complete with realistic values for the coils and capacitors involved.
L12 RS C C 2. Increasing the permeability of the magnetic path increases the coupling. RL 3. Shielding a transformer decreases its loaded Q and has the effect of increasing the coupling. (B) Above resonance FIG. 2-25. Equivalent circuit of inductively coupled resonant circuits. way to correct the problem would be to add a “top-L” coupled section to the existing network. The top-L coupling would attempt to skew the response in the opposite direction and would, therefore, tend to counteract any skew caused by the capacitive coupling.