( It ( ( is ( used ( in ( ( a circuit ) ( that ( ( drives ( the grid ) ) ( with ( ( a voltage ) ( that ( changes ( with ( signal strength ) ) ) ) ) ) ) ) ) ) ) ) ; ) )
(ROOT (S (NP (PRP It)) (VP (VBZ is) (VP (VBN used) (PP (IN in) (NP (NP (DT a) (NN circuit)) (SBAR (WHNP (WDT that)) (S (VP (VBZ drives) (NP (DT the) (NN grid)) (PP (IN with) (NP (NP (DT a) (NN voltage)) (SBAR (WHNP (WDT that)) (S (VP (VBZ changes) (PP (IN with) (NP (NN signal) (NN strength))))))))))))))) (: ;)))
It is used in a circuit that drives the grid with a voltage that changes with signal strength;
(ROOT (S (NP (NNP Voltage)) (VP (VBZ is) (ADJP (RB continuously) (VBG changing) (PP (IN within) (NP (NP (DT a) (NN circuit)) (PP (IN in) (NP (DT an) (JJ analog) (NN signal))))))) (. .)))