초록 ▼

A voltage generating system comprising generators for producing a plurality of reference voltages, switching devices provided in the reference voltage generators such that any of a given one or given ones of the reference voltages may be selectively taken out, an integrator to smooth a selected refe

A voltage generating system comprising generators for producing a plurality of reference voltages, switching devices provided in the reference voltage generators such that any of a given one or given ones of the reference voltages may be selectively taken out, an integrator to smooth a selected reference voltage to obtain an output voltage, a switching pulse generator to produce a switching pulse signal for switching the switching devices and a circuit to vary the duty ratio of the switching pulse signal so as to vary the magnitude of the output voltage. This voltage generating system may be used for generating a channel selection voltage for electronic tuners (varactor tuners), for digital-to-analog converter circuits etc.

대표청구항 ▼

A voltage generating system comprising: a plurality of means for generating at lest two different reference voltages VA and VB; a plurality of switching means, coupled to said reference voltage generating means, respectively, for selectively taking out the reference voltages; a switching pulse gener

A voltage generating system comprising: a plurality of means for generating at lest two different reference voltages VA and VB; a plurality of switching means, coupled to said reference voltage generating means, respectively, for selectively taking out the reference voltages; a switching pulse generating means for generating switching pulses and for supplying the switching pulses to said switching means, the switching pulses having certain duty ratios to cause at least one of said switching means to switch with a certain duty ratio, and the other said switching means to switch to their on state or with an inverse phase with respect to the switching phase of said at least one switching means; smoothing means for smoothing the switched reference voltages taken out from said switching means, and for outputting any of a plurality of output voltages which are obtained by dividing the reference voltages into a plurality of steps, the voltage to be outputted being determined by the duty ratios; and means for selecting which of the plurality of output voltages is to be outputted by changing the duty ratios of the switching pulses supplied to said switching means.