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

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It can be made to sum, multiply by constants, and integrate voltages, and to drive such things as multipliers, voltmeters and recorders in associated equipment. Much design effort has gone into the perfection of low noise, stable, drift-free amplifiers with band widths of up to 100 kc/s. Such an amplifier is a precision piece of equipment, very reliable, and useful in many fields other than analogue computation. Consider Fig. c. amplifier. We assume for the moment that it draws no current at its input A, which will in practice be the grid of its first valve, that it has an effectively infinite negative gain, and that it does not drift.

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. This impedance is reduced to the order of a milliohm by the high negative feedback introduced by the external feedback component. The presence of the synchronous chopper relay circuit introduces noise at the chopper frequency.

T. R. HOFFMAN, Analogue multiplication using time as one variable, Electronics, 12 Aug. 1960. M. V. GAL'PERIN, Analysis of analog computer error due to finite pass band of operational amplifiers, Autom. & Rem. Control, 25, May 1964. Η. M. PAYNTER and J. SUEZ, Automatic digital setup and scaling of analog computers, /. Soc. Am. , 3, Jan. 1964. chapter 3 SCALING AND APPLICATIONS INTRODUCTION We have discussed in the last chapter the electronic equipment that has been produced to perform the operations of addition, multiplication, division, integration and the production of nonlinear functions.

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