A sequentially-switched variable-gain operational amplifier

G.B. Lockhart and J.C. Earls

Mathematics and Computers in Simulation (MATCOM), 1966, vol. 8, issue 4, 187-188

Abstract: A means for changing the gain or time constant of operational amplifiers in a precribed sequence of sixteen steps is described. Four bistable multivibrators are used the outputs of which control balanced diode switches. The first stage multivibrator is triggerred from a pulse generator which also controls the resetting of integrators. The latter operation is achieved using a single triode valve in parallel with the integrating capacitor and an auxiliary input to the integrator. Switching at a frequency of 10 kc/s is readilly obtained but lower switching frequencies (say 10 to 100 c/s) are more reasonable in practice. It is estimated that at such frequencies the gain may be switched with an accurancy of 2%.

Date: 1966
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Persistent link: https://EconPapers.repec.org/RePEc:eee:matcom:v:8:y:1966:i:4:p:187-188

DOI: 10.1016/S0378-4754(66)80002-2

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