Resources Contact Us Home
Pulse width modulation circuit

Image Number 13 for United States Patent #5451900.

To suppress electromagnetic radiation without exerting any harmful influence upon both S/N ratio and dynamic range, a pulse width modulation circuit includes an integrating circuit for integrating an input signal applied to an input terminal with respect to time, a comparing circuit connected to the integrating circuit and having hysteresis characteristics, a feedback circuit for feeding back the output of the comparing circuit to an input of the integrating circuit, and an amplitude modulation circuit, provided in a loop including the integrating circuit and the comparing circuit, for implementing amplitude modulation to modulate a frequency of the output of the comparing circuit. Further, the output of the comparing circuit can be fed-back to the integrating circuit via an amplitude modulation circuit. Alternatively, the amplitude of the output of the integrating circuit is first modulated by the amplitude modulation circuit, before being applied to the comparing circuit. A dither signal is applied to the amplitude modulation circuit or, alternatively, a signal for maintaining frequency of the pulse modulated signal may be applied.

  Recently Added Patents
LED string with a capability to maintain a current path and LED unit thereof
Portable communication terminal, communication method and control program
Asynchronous line interface rate adaptation to the physical layer with synchronous lines at the connection layer
Multiple-frequency inversion method and control apparatus for internal combustion engine driven generator
Device and method for superimposing patterns on images in real time, particularly for guidance by location
Efficient forward ranking in a search engine
Facial recognition using a sphericity metric
  Randomly Featured Patents
Ionographic imaging members and methods for making and using same
Front end shock absorbing apparatus for wheeled vehicle
Hydrothermal growth on non-linear optical crystals
Mounting for variably settable stator blades in a compressor
Stable non- aqueous single phase viscous vehicles and formulations utilizing such vehicles
Open structure breast coil and support arrangement for interventional MRI
Electromagnetic interference suppressing device and circuit
Identification label
Method of detecting nonuniformity of sensitivity of radiation detector
Method and communication system for continuously recording sounding information