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resonant circuit This waste of power can be minimized by using only high-Q inductors in the tank But because the inductor and capacitor currents in a parallel circuit are 180 degrees out of phase with each other, high circulating currents will always exist within the tank itself during resonance (Fig 68) This circulating current is due to the two LC components exchanging current in a flywheeling manner However, as these currents are completely out of phase, current flow into the tank is always at a minimum, and is dependent on the pure resistance within the tank caused by component Q limitations A simple bandpass filter (BPF) is shown in Fig 69 Since it is an LC parallel filter in shunt with the output, all nonresonant frequencies will be sent to ground, while the bandwidth of interest will be passed on to the output because of the high impedance created by the tank at resonance This creates a selective RF output voltage across the circuit so that it functions as a BPF The bandstop of Fig 610 has the parallel circuit in series with the output Thus, it will pass all frequencies except resonant frequency, which is dropped across the high impedance of the tank Since this will cause a decrease in the output amplitude at this single range of frequencies, it functions as a bandstop filter (BSF) Most filters work by passing any frequencies within the passband with little attenuation while reflecting not absorbing most of the undesired signals within its stopband back toward the source These reflections can become a serious problem in wireless systems design, as we shall soon see Filters must not only shape a signal, reject spurious frequencies, and choose one frequency band out of many, but they must also maintain a specific input and output impedance through much of their passband that is identical to the system s impedance (usually 50 or 75 ohms) Different types of filters, such as LC, crystal, SAW, and distributed, will have various frequency bands in which they are most commonly employed because of size, price, and/or performance: 1 LC filters can be utilized from 1 kHz all the way up to 15 GHz As the frequencies increase, however, so does the difficulty in implementation because of the distributed inductance and capacitance, which conspire to lower the frequency of the filter as designed, as well as distort its response.

ISO Equivalencies:

TABLE A-1

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Several Cloud Computing Vendors (continued)

If there are any IF filters between the AGC output coupler and the gain-controlled IF amplifiers that have excessive group delay, this can cause time impediments in sensing that a signal has increased or decreased in amplitude, causing AGC loop instabilities Another major cause of loop instability can be the desire to obtain excessively tight AGC control of the IF or baseband output amplitude In most cases, an AGC circuit with less gain and less absolute control of the output amplitude will be much more stable It is still possible, nonetheless, to safely design and construct an AGC loop that can control the output signal to within 2 dB (or better) If the receiver s LNA is to be AGC controlled, it is almost always critical to maintain the noise figure of the receiver within reasonable limits Unfortunately, any AGC action will naturally decrease the receiver s NF By adding a delay diode in the AGC bias line back to any front-end amplifiers, the start of gain control can be postponed slightly This will allow the LNA to maintain its NF, and that of the entire receiver, until it is absolutely required to decrease the gain at the front end Even if there will not be an AGC connection to the LNA (or any other RF amplifier), a delay diode is still a good idea for the first IF gain-controlled amplifier in the IF strip, since this will help, in a small way, in maintaining a superior noise figure All AGC-controlled amplifiers should be decoupled from each other by a small value of in-line resistor (100 ohms) and a ceramic capacitor to ground at each VGA s DC gain control port This will slow undesired interaction between gain-controlled stages

Removable Memory Included: Power Source:

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Appendix:

In the early prototype stages of an AGC circuit it is a good idea to utilize trimmers in place of certain critical fixed resistors in order to allow the values of the AGC s loop to be empirically optimized 84 Attenuators