Built in loop back self test in design or on test board for transceivers
First Claim
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1. A transceiver communication device comprising:
- a transmitter configured to provide a transmitter output signal;
a receiver configured to selectively receive a receiver input signal, wherein the receiver input signal has a predefined frequency and a predefined amplitude, wherein the predefined frequency is selectable over a range of receive frequencies and the predefined amplitude is selectable over a range of receive amplitudes; and
a built in self test (BIST) circuit operable in a test mode to receive the transmitter output signal and provide the receiver input signal.
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Abstract
In a method and system for testing a transceiver communication device operating in a test mode, a transmitter output signal generated by a transmitter is adjusted and provided as a loop back to a receiver. The adjustment includes shifting a frequency and attenuating amplitude of the transmitter output signal to substantially match a predefined frequency and a predefined amplitude of a receiver input signal received by the receiver. A pass or fail status of the device is determined by comparing transmitted and received data.
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Citations
20 Claims
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1. A transceiver communication device comprising:
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a transmitter configured to provide a transmitter output signal;
a receiver configured to selectively receive a receiver input signal, wherein the receiver input signal has a predefined frequency and a predefined amplitude, wherein the predefined frequency is selectable over a range of receive frequencies and the predefined amplitude is selectable over a range of receive amplitudes; and
a built in self test (BIST) circuit operable in a test mode to receive the transmitter output signal and provide the receiver input signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A test system comprising:
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a tester to provide a plurality of test signals;
a device under test (DUT) to receive the plurality of test signals, wherein the DUT includes a transceiver for providing a transmitter output signal and for receiving a receiver input signal, wherein the receiver input signal has a selectable predefined frequency and a selectable predefined amplitude; and
a loop back circuit to receive the transmitter output signal and receive a local oscillator signal to provide the receiver input signal. - View Dependent Claims (15, 16, 17)
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18. A method of testing a transceiver device having a transmitter and a receiver, the method comprising:
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receiving an input to place the device in a test mode, wherein the test mode enables a loop back of a transmitter output signal to a receiver input signal;
converting the transmitter output signal to substantially match the receiver input signal having a predefined frequency and a predefined amplitude; and
providing the receiver input signal having the predefined frequency and the predefined amplitude to the receiver. - View Dependent Claims (19, 20)
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Specification