Patents by Inventor Wood Nang Cheung

Wood Nang Cheung has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Low noise photon coupled circuit
    Patent number: 5834763
    Abstract: A photon coupled circuit comprises a high quantum efficiency semiconductor light emitter (TDA) coupled with low photon losses to a high quantum efficiency semiconductor light detector (OLD). Bias current is provided to both the light detector (OLD) and light emitter (TDA). The light output of the light emitter (TDA) is modulated by the signal current flowing therein and the current flowing (i.sub.o) in the detector (OLD) is modulated by the light received from the light emitter (TDA). The quantum transfer efficiency or open loop current gain is greater than 0.5 and a portion of the AC current flowing in the light detector (OLD) is applied as feedback to reinforce or oppose the current flowing in the light emitter (TDA).
    Type: Grant
    Filed: March 14, 1997
    Date of Patent: November 10, 1998
    Inventors: Paul Julian Edwards, Wood Nang Cheung