D. Welbourne and P. Hammond (Auth.)'s Analogue Computing Methods PDF

By D. Welbourne and P. Hammond (Auth.)

ISBN-10: 0080106803

ISBN-13: 9780080106809

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9. ^_ Power eorth— -*^ ELECTRONIC 35 36 ANALOGUE COMPUTING METHODS Then the current balance gives " V—V £ _J î = o, i=0 Also, Therefore where Z 0 is the feedback impedance. Zi F 0 = MVr yij=_lî_12yi.. MZ, Z0 M^oZl For an amplifier with five 1 ΜΩ inputs, two 100 kD inputs, two 500 kQ inputs and a 1 ΜΩ feedback resistor, which will give gains of 1, 10 and 2, the quantity Σ^^ΟίΜΩΓ 1 . i z i For an amplifier gain of M = 107 times, the error term Yi y i in the above equation for V0/Z0 gives an error current of 3 x 10~6K0 μΑ with the resistor values given.

E. the amplifier now amplifies (Vg-Vc) by -M, giving output Vc = —M(Vg— Vc). Now Vc= —NVg, so the final output is Ve=-M(N+l)Vg. c. stage only. c. stage is Vd, referred back to the input as if it occurred there, we have V0=-M{Vg+Vd-(-NVg)}. Therefore V0 = -M(N+l)Vg-MVd. c. c. amplifying stage. c. c. stage alone. c. amplifier is given in Fig. 9. c. c. amplifier output going to the grid of the other valve of the pair. The output stage is a cathode follower, which can give up to 10 mA without distortion in the range +100 to — 100V at an output impedance of 1000 Ω or so.

A typical performance is 1° phase shift at 2 kc/s, 1 per cent accuracy in that range. They need careful screening from stray fields, and careful setting up. They have been used in computers and response analysers to give the reference and quadrature components of a system output when driven by a sine-wave input. HALL EFFECT MULTIPLIERS If a rectangular semiconductor wafer in the X- Y plane has steady current /flowing in its ^-direction, and a magnetic field B exists perpendicular to the plane of the wafer, a small voltage will appear across it in the 7-direction.

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Analogue Computing Methods by D. Welbourne and P. Hammond (Auth.)

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