Oblon, Spivak, McClelland, Maier & Neustadt, P.C.
Time constant automatic adjusting circuit, filter circuit system, and method of automatically adjusting time constant
A time constant automatic adjusting circuit comprises: a filter circuit varying a phase of an clock signal to be input so as to output the clock signal; a phase comparison circuit comparing a phase of an output signal of the filter circuit with the phase of the clock signal, and outputting a predetermined voltage when the phase of the output signal and the phase of the clock signal are the same; at least three comparators comparing the output voltage with a plurality of different voltages; an up-down counter counting a number of output bits of either one of the at least three different voltages in accordance with an output result of the comparators; and a control circuit varying the time constant of the filter circuit in accordance with the number of output bits counted by the up-down counter.
Kabushiki Kaisha Toshiba
H
H03H
inventional
Tetsuro Osamu Rui Shigehito
Itakura Watanabe Ito Saigusa