Amplifier for outputting motor controlling signal in motor contr

Details Amplifier for outputting motor controlling signal in motor contr Amplifier for outputting motor controlling signal in motor contr

1989-12-12

1991-05-07

Mottola, Steven

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330288, H03F 345

Patent

active

050140205

ABSTRACT:
A motor controlling circuit used for controlling the drive of a motor, and particularly to improvements of the control characteristics of the amplifier. A current setting transistor for setting an amount of current flowing from a differential amplifier to a predetermined value is disposed on the downstream side of the differential amplifier. The amount of current flowing across this current setting transistor is varied in response to the level of an input signal to the amplifier, so that the current outputting capability of the differential amplifier is proportional to the level of the input signal. Accordingly, when the level of the input signal is small, the gain of the amplifier is made small, and a gain for an amount of ripple at that time is also made small. Hence, it is possible to control an adverse effect of the ripple carried on the input signal when the level of the input signal is small. In addition, it is possible to eliminate an output current when the level of the input signal is zero, thereby controlling the generation of an error current due to an offset.

REFERENCES:
patent: 4654602 (1987-03-01), Aoki
patent: 4658190 (1987-04-01), Miyazaki et al.
patent: 4804892 (1989-02-01), Muller

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