Loop Filter

Some articles on loop filter, loop, loops, filter:

Frequency Synthesizer - Use As A Frequency Modulator
... modulating signal is added to the output of the loop filter, directly varying the frequency of the VCO and the synthesizer output ... Any spectral components in the modulating signal too low to be blocked by the loop filter end up back at the VCO input with opposite polarity to the modulating signal, thus ... (The loop effectively sees these components as VCO noise to be tracked out.) Modulation components above the loop filter cutoff frequency cannot return to the VCO input so they remain in the VCO output ...
Phase-locked Loop - Modeling - Linearized Phase Domain Model
... Phase locked loops can also be analyzed as control systems by applying the Laplace transform ... The loop response can be written as Where is the output phase in radians is the input phase in radians is the phase detector gain in volts per radian is the VCO gain in radians per volt-second is the loop filter ... The simplest filter is a one-pole RC circuit ...
Switched-mode Power Supply - SMPS and Linear Power Supply Comparison
... a simpler circuit (and simpler feedback loop stability criteria) than switched-mode circuits ... transistors and diodes as well as a power transformer, inductors, and filter capacitors ... One of the outputs has to be chosen to feed the voltage regulation feedback loop (usually 3.3 V or 5 V loads are more fussy about their supply voltages than the 12 V loads, so ...