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公开(公告)号：CA2245113A1
公开(公告)日：2000-02-14
申请号：CA2245113
申请日：1998-08-14
Applicant: IBM CANADA
Inventor： HARTLEY LEE F , FENG KAI DI
Abstract: The invention provides a low-power selector circuit contained within an integrated circuit chip for selecting among a plurality of functions of the integrated circuit chip. The invention comprises a gated and pull-up resistor for connection to a power supply and connected to an input/output terminal pad of said integrated circuit chip; a sampling latch; a power-on reset circuit; said sampling latch being adapted on enablement by said poweron reset circuit to sample the voltage of the input/output terminal pad of said integrated circuit chip on power-up, to output a control signal to control functions of said integrated circuit chip, and in a predetermined situation to gate said pull-up resistor to an off state.
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Patent Agency Ranking
公开(公告)号：CA2245113C
公开(公告)日：2001-05-01
申请号：CA2245113
申请日：1998-08-14
Applicant: IBM CANADA
Inventor： FENG KAI DI , HARTLEY LEE F
Abstract: The invention provides a low-power selector circuit contained within an integrated circuit chip for selecting among a plurality of functions of the integrated circuit chip. The invention comprises a gated and pull-up resistor for connection to a power supply and connected to an input/output terminal pad of said integrated circuit chip; a sampling latch; a power-on reset circuit; said sampling latch being adapted on enablement by said power - on reset circuit to sample the voltage of the input/output terminal pad of said integrated circuit chip on power-up, to output a control signal to control functions of said integrated circuit chip, and in a predetermined situation to gate said pull-up resistor to an off state.
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公开(公告)号：CA2194022C
公开(公告)日：2000-08-08
申请号：CA2194022
申请日：1996-12-24
Applicant: IBM CANADA
Inventor： FENG KAI DI
Abstract: An infrared communication system is provided which includes a photodetector for detecting infrared signals from an infrared transmitter source and converting the infrared signals to electrical signals, a first delay device having a input coupled to the photodete ctor for delaying the signal from the photodetector for a predetermined period of time re lated to the rise time of an expected electrical signal from photodetector, a voltage divider having an input coupled to the photodetector for reducing the amplitude of the signal from the photodetector, a second delay device having an input coupled to the output of th e voltage divider for delaying the reduced signal from the photodetector for a predetermin ed period of time related to the fall time of an expected electrical signal from the photodet ector, a first voltage comparator coupled to an output of the first delay device and to an outp ut of the voltage divider compares the signals received therefrom and adapted to generate the front edge of a voltage output in response to the detection of the front edge of a pul se from the photodetector; and a second voltage comparator having an input coupled to the ph otodetector into an output of the second delay device for generating back edge of a voltage output in response to detection of the back edge of a pulse from the photodetector.
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公开(公告)号：CA2193782A1
公开(公告)日：1998-06-23
申请号：CA2193782
申请日：1996-12-23
Applicant: IBM CANADA
Inventor： FENG KAI DI
Abstract: An infrared communication device with an adaptive configuration controller for programming system parameter settings with command codes. The adaptive configuration controller comprises a number of shift registers and control circuits. The registers store command codes for configuring system parameters including bandwidth, sensitivity and LED drive current. The codes are obtained from an external source. The capability to program the system parameter settings allows the communication device to be adapted or reconfigured for optimal operation in response to changes in the environment without the need for removing or adding external components.
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公开(公告)号：CA2325685A1
公开(公告)日：2002-05-10
申请号：CA2325685
申请日：2000-11-10
Applicant: IBM CANADA
Inventor： FENG KAI DI
IPC: H03K3/3565 , H03K17/22 , H03K19/0185 , H04B10/04
Abstract: An input buffer for an optical receiver or transceiver which provides symmetrical hysteresis and zero static current, comprises two field effect transistors (FETs) which form the basic buffer logic circuit, two FETs which respectively provide offset voltages to the buffer logic FETs, and two FETs which provide positive feedback. In the preferred embodiment the input buffer provides multiple-channels, each channel comprising a component inverter designed to provide zero static current and symmetrical hysteresis for a different input signal mode.
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公开(公告)号：CA2194022A1
公开(公告)日：1998-06-24
申请号：CA2194022
申请日：1996-12-24
Applicant: IBM CANADA
Inventor： FENG KAI DI
Abstract: This invention provides a solution to the problem of determining how long the peak value detected for the first pulse be kept, and when should it be updated. In infrared communication, the communication distance may vary over time during the transmission. For instance in a mobile infrared telephone the users generally are moving with respect to each other. The signal amplitude changes within a very large range over time and the receiver expected to operate in this environment must also handle a large number of different communication protocols. It uses the instant signal as a basis for adjusting the threshold. The present invention is capable of accepting a wide input dynamic range of signals up to and beyond five orders of magnitude (50 dB). This is accomplished while overcoming the difficulties presented by many communications protocols, by providing a technique in which the output pulse width of an amplified photo detector input is not strongly dependent upon the input signal amplitude.
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