Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1983-04-20
1985-02-19
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330294, H03F 316, H03F 345
Patent
active
045008469
ABSTRACT:
An improved output circuit for an operational amplifier which is controlled to operate in one of two modes. In the first mode, the output of the operational amplifier tracks a reference signal or ground. In the second mode, the output of the operational amplifier tracks the level of a time varying second voltage signal. The improvement consists of replacing the stabilization capacitor of prior art output circuits with a pair of stabilization capacitors connected in parallel. Each of the pair of capacitors has an associated series connected switch for switching the capacitor into and out of the circuit. The switches are operated by a respective one of a pair of external non-overlapping clock pulse trains so as to not be closed simultaneously. The effect of this improved output circuit is to allow the output voltage of the operational amplifier to slew rapidly (or snap) up to the last previous level of a sampled input voltage (or a predetermined second reference voltage) thereby minimizing the effects imposed by the limiting of the first stage slew rate. Thus, slewing begins at a higher rate, governed primarily by the higher slew rate capability of the output stage, and consumes less time. In addition, the output voltage will snap directly from the level of the sampled time varying second voltage to the reference voltage level at the same high slew rate of the output stage. Because the voltage difference through which the stabilization capacitor must charge is greatly reduced, the output is able to reach and track the time varying voltage more rapidly than can prior art devices. The output of the operational amplifier thus shows greater correlation with the level of the second or time varying signal.
REFERENCES:
Jenkins, J. O. M., "Reduction of Amp Offset & Drift", Elec. Engring., vol. 48, No. 586, p. 19, Dec. 1976.
Lewyn Lanny L.
Lucas Charles H.
Brown Charles D.
Hughes Aircraft Company
Karambelas A. W.
Mottola Steven J.
Mullins James B.
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