Electronic apparatus for biological research electronicappara00dona Year: 1958 RESISTANCE AND CAPACITANCE IN SERIES which simplifies to jcoCR^R^ + Ri jcoCR^R^ + i?i + i?2 Now assume, as is usually possible, that R2 ^ Ri Fout jcoCR^R^ + Ri Now let Re, Kin jcoCR^R^ + i?2 aR' and i?i = i^'/a 1 Fout Kin ycoCi?'2 + aR' jcoCR' + a Kin UcoCT?')' + a' Rationalizing, we find the phase shift is a (f> = tan' 1 a 1 coCR 7 + coCi?' The performance of these 'limited phase shift' filters is plotted in Graphs 12 and 13 for various values of a. Evidently the price one has to pay for limited phase shift is
Electronic apparatus for biological research electronicappara00dona Year: 1958 RESISTANCE AND CAPACITANCE IN SERIES which simplifies to jcoCR^R^ + Ri jcoCR^R^ + i?i + i?2 Now assume, as is usually possible, that R2 ^ Ri Fout jcoCR^R^ + Ri Now let Re, Kin jcoCR^R^ + i?2 aR' and i?i = i^'/a 1 Fout Kin ycoCi?'2 + aR' jcoCR' + a Kin UcoCT?')' + a' Rationalizing, we find the phase shift is a (f> = tan' 1 a 1 coCR 7 + coCi?' The performance of these 'limited phase shift' filters is plotted in Graphs 12 and 13 for various values of a. Evidently the price one has to pay for limited phase shift is limited attenuation. R-C circuits which phase shift but do not filter Phase-shifting networks are occasionally useful; they may be employed in conjunction with other circuitry to produce time delays, and are also Figure valuable in circuits for producing a 50 cycle signal of variable amplitude and phase for cancelling interference from mains pickup in amplifiers. One such is shown in Figure ; we have C-D Kin B-D in K B-C Kin jcoCR 1 + jcoCR 1 2 1 jcoCR 1 + JcoCR 45
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