Input-output circuit and a testing apparatus
AssigneeAdvantest Corporation
InventorTakashi Sekino
Life of this patent
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Abstract
An input-output circuit sending and/or receiving a signal to and/or from an electronic device includes a driver for supplying a signal to the electronic device, a comparator provided parallel to the driver for receiving a signal from the electronic device, a relaying circuit provided between the comparator the electronic device in series with the comparator and the electronic device, a first transmission line for coupling the comparator and the relaying circuit electrically and a first switch for selecting either of short or open-circuited state of the first transmission line and the electronic device, wherein the impedance of the relaying circuit is larger than the impedance of the first transmission line.
Claims17
An input-output circuit sending and/or receiving a signal to and/or from an electronic device, comprising:
- a driver for supplying a signal to said electronic device;
- a comparator parallel to said driver for receiving a signal from said electronic device;
- a relaying circuit provided in series between said comparator and said electronic device;
- a first transmission line for coupling said comparator and said relaying circuit electrically;
- and
- a first switch for selecting either of short or open-circuited state of first transmission line and said electronic device,
- wherein impedance of said relaying circuit is larger than impedance of said first transmission line.
A testing apparatus for testing an electronic device, comprising:
- a pattern generating unit for generating a test pattern for testing said electronic device;
- a waveform adjusting unit for adjusting said test pattern;
- an input-output circuit for supplying said test pattern adjusted by said waveform adjusting unit to said electronic device and receiving an output signal outputted by said electronic device based on said test pattern;
- and
- a judging unit for judging quality of said electronic device based on said output signal,
- wherein said input-output circuit comprises:
- a driver for supplying said test pattern to said electronic device;
- a comparator provided parallel to said driver for receiving an output signal from said electronic device;
- a relaying circuit provided in series between said comparator and said electronic device;
- a first transmission line for coupling said comparator and said relaying circuit electrically;
- and
- a first switch for selecting either of short or open-circuited state of said first transmission line and said electronic device,
- wherein impedance of said relaying circuit is larger than impedance of said first transmission line.
Dependencies are inferred from the claim text.