PULSE-WIDTH MODULATOR Russian patent published in 2001 - IPC

FIELD: radio engineering. SUBSTANCE: pulse- width modulator is related to electrical circuits of time-pulse converters. It can find use in design of mixed-signal instruments and computers. In proposed pulse-width modulator demodulation of output pulse-width signal with time division of stages of conversion process is carried out in feedback circuit which excludes error caused by actual values of passive components included in mix of device. Modulator has generator 1 of synchronizing pulses, reference voltage source 2, comparator 3, first key 4, integrator 5, retrieval and storage unit 6, pulse distributor 7, second key 8 and digital accumulating former 9 of pulse- width signal. Output of first key 4 is connected to input of integrator 5 whose output is linked to information input of retrieval and storage unit 6. Output of reference voltage source 2 is connected to input of first key 4. Output of retrieval and storage unit 6 is tied up with information input of second key 8 and with inverting input of comparator 3 whose noninverting input is input of pulse-width modulator. Output of comparator 3 is connected to information input of digital accumulating former 9 whose output is output of pulse-width modulator integrated with synchronization input of pulse distributor 7. Three outputs of the latter are connected to controlling inputs first key 4, second key 8 and retrieval and storage unit 6. Outputs of keys 4 and 8 are tied up together and output of generator 1 of synchronizing pulses is connected to input of digital accumulating former 9. EFFECT: increased operational accuracy of modulator with simultaneous simplification of its design. 4 dwg