ApplicationNo. 07/037765 filed on 04/13/1987
US Classes:332/110Including discrete semiconductor device having three or more electrodes
ExaminersPrimary: LaRoche, Eugene R.
Assistant: Mis, David
Attorney, Agent or Firm
International ClassesH03K 7/08 (20060101)
H03K 7/00 (20060101)
Foreign Application Priority Data1986-06-09 DE
AbstractA pulse-width modulator comprising a square-wave generator which triggers a monostable multivibrator driven by a controllable constant current source, the multivibrator having a capacitor as a timing element. The output of the multivibrator controls a gate circuit to which the square wave is also applied, thereby controlling the width of the square wave output from the gate circuit. The modulator can be assembled from standard CMOS building blocks and several external components, thereby achieving a power dissipation below 10 mW. If the current source is controlled by a CMOS variable-gain amplifier, the modulator can serve as the control circuit of a clocked direct voltage converter having internal losses below 25 mW.