System and method for built-in self-test of electronic circuits
AssigneeTexas Instruments Incorporated
InventorsROBERT FLOYD PAYNE, LAMBERT JACOB HELLEMAN
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Abstract
In described examples of a device with built-in-self-test, a multiplexer has at least first and second input terminals and is coupled to receive a first input signal at the first input terminal, a second input signal at the second input terminal, and selection signals. Also, the multiplexer is coupled to output: the first input signal in response to a first combination of the selection signals; the second input signal in response to a second combination of the selection signals; and an analog summation of the first and second input signals in response to a third combination of the selection signals.
Claims16
A device comprising:
- a multiplexer having at least first and second input terminals and coupled to receive a first input signal at the first input terminal, to receive a second input signal at the second input terminal, to receive selection signals, and to output:
- the first input signal in response to a first combination of the selection signals;
- the second input signal in response to a second combination of the selection signals;
- and an analog summation of the first and second input signals in response to a third combination of the selection signals.
A method comprising:
- generating a first signal;
- providing the first signal to a first input terminal of a multiplexer;
- generating a second signal;
- providing the second signal to a second input terminal of the multiplexer;
- with the multiplexer, generating a third signal as an analog summation of the first and second signals;
- and
- from the multiplexer, providing the third signal to test the device.
An integrated circuit comprising:
- a multiplexer having at least first and second input terminals and coupled to receive a first input signal at the first input terminal, to receive a second input signal at the second input terminal, to receive selection signals, and to output:
- the first input signal in response to a first combination of the selection signals;
- the second input signal in response to a second combination of the selection signals;
- and an analog summation of the first and second input signals in response to a third combination of the selection signals;
- a transmitter coupled to:
- provide the second input signal to the multiplexer;
- and selectively change an amplitude of the second input signal in response to a first control signal;
- a phase shifter coupled to selectively change a phase of a clock signal to the transmitter in response to a second control signal, wherein a phase of the second input signal is selectively changed by selectively changing the phase of the clock signal;
- at least one receiver circuit coupled to provide at least one local signal in response to the output of the multiplexer;
- an error detector coupled to generate at least one comparison signal to indicate whether the at least one local signal matches an expected output of the at least one receiver circuit;
- and
- a control unit coupled to provide the first input signal, the selection signals, and the first and second control signals in response to the at least one comparison signal from the error detector.
Dependencies are inferred from the claim text.