Fully-Digital BIST for RF Receivers
First Claim
1. A method of testing a receiver to measure an intermodulation tone at using a built-in self-test system, the method comprising:
- generating a test signal using a stimulus generator, the test signal comprising first and second tones at respective first and second frequencies, wherein the first and second frequencies are spaced by an offset frequency, and wherein the first frequency comprises a non-integer multiple of the offset frequency;
applying the test signal to a downconverter of the receiver to downconvert the test signal to generate an In-phase component and a Quadrature component; and
demodulating, in a demodulator of the receiver, the In-phase and Quadrature components based on a reference frequency to measure an amplitude of the intermodulation tone,wherein the stimulus generator, the downconverter, and the demodulator are disposed on a common receiver chip.
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Accused Products
Abstract
A built-in receiver self-test system provides on-chip testing with minimal change to the receiver footprint. The system digitally generates a two-tone test signal, and tests the nonlinearities of the receiver using the generated two-tone test signal. To that end, the self-test system comprises a stimulus generator, a downconverter, and a demodulator, all of which are disposed on a common receiver chip. The stimulus generator generates a test signal comprising first and second tones at respective first and second frequencies, where the first and second frequencies are spaced by an offset frequency, and where the first frequency comprises a non-integer multiple of the offset frequency. The downcoverter downconverts the test signal to generate an In-phase component and a Quadrature component. The demodulator measures an amplitude of the intermodulation tone by demodulating the In-phase and Quadrature components based on a reference frequency.
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Citations
32 Claims
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1. A method of testing a receiver to measure an intermodulation tone at using a built-in self-test system, the method comprising:
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generating a test signal using a stimulus generator, the test signal comprising first and second tones at respective first and second frequencies, wherein the first and second frequencies are spaced by an offset frequency, and wherein the first frequency comprises a non-integer multiple of the offset frequency; applying the test signal to a downconverter of the receiver to downconvert the test signal to generate an In-phase component and a Quadrature component; and demodulating, in a demodulator of the receiver, the In-phase and Quadrature components based on a reference frequency to measure an amplitude of the intermodulation tone, wherein the stimulus generator, the downconverter, and the demodulator are disposed on a common receiver chip. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A built-in receiver self-test system for measuring an intermodulation tone, the system comprising:
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a stimulus generator configured to generate a test signal, the test signal comprising first and second tones at respective first and second frequencies, wherein the first and second frequencies are spaced by an offset frequency, and wherein the first frequency comprises a non-integer multiple of the offset frequency; a downconverter operatively connected to the stimulus generator and configured to downconvert the test signal to generate an In-phase component and a Quadrature component; and a demodulator operatively connected to the downconverter and configured to measure an amplitude of the intermodulation tone by demodulating the In-phase and Quadrature components based on a reference frequency, wherein the stimulus generator, the downconverter, and the demodulator are disposed on a common receiver chip. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A method of generating a test signal for a built-in receiver self-test system used to measure an intermodulation tone, the method comprising:
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generating a first signal at a first frequency based on an oscillator output signal at an oscillator frequency, said first frequency being less than said oscillator frequency; dividing the oscillator output signal by a first divisor to generate an offset signal at an offset frequency; and generating the test signal by switching the first signal on and off responsive to the offset signal, the test signal comprising a first tone at the first frequency and a second tone at a second frequency separated from the first frequency by the offset frequency, wherein the first frequency comprises a non-integer multiple of the offset frequency. - View Dependent Claims (18, 19, 20, 21, 22, 23)
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24. A test signal generator for a built-in receiver self-test system used to measure an intermodulation tone, the test signal generator comprising:
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a first signal generator configured to generate a first signal at a first frequency based on an oscillator output signal at an oscillator frequency; a first divider to divide the oscillator output signal by a first divisor to generate an offset signal at an offset frequency; and a logic gate operatively connected to an output of the first signal generator and the first divider, the logic gate configured to switch the first signal on and off responsive to the offset signal to generate the test signal, the test signal comprising a first tone at the first frequency and a second tone at a second frequency separated from the first frequency by the offset frequency, wherein the first frequency comprises a non-integer multiple of the offset frequency. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31, 32)
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Specification