Test signal generation and application in receivers
First Claim
1. A receiver circuit, comprising:
- a test signal generation component configured to generate a single side band (SSB) test signal independent from a signal received by a reception path of the receiver circuit, wherein the test signal generation component comprises;
a SSB signal generator configured to generate an IQ baseband signal having an in-phase signal component and a quadrature phase signal component;
first and second magnitude setting blocks located downstream of the SSB signal generator and respectively configured to selectively vary a magnitude of the in-phase signal component based upon a first amplitude setting word and to vary a magnitude of the quadrature phase signal component based upon a second amplitude setting word; and
an IQ modulator configured to receive the IQ baseband signal and to generate the SSB test signal by modulating the IQ baseband signal onto a local oscillator signal,a test signal injection point configured to provide the SSB test signal to the reception path of the receiver circuit; and
a mixer located within the reception path at a location downstream of the test signal injection point, the mixer configured to mix the SSB test signal with the local oscillator signal to generate a down-converted output signal indicative of an error in the reception path.
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Accused Products
Abstract
One embodiment of the present invention relates to a test signal generator configured to generate a single sideband (SSB) test signal that is used for testing components of one or more receiver chains to identify errors in the receiver chains. In one embodiment, the circuit comprises a SSB signal generator configured to generate an IQ baseband signal comprising a sequence of constellation points corresponding to the SSB test signal. The constellation points are modulated onto a high frequency local oscillator signal to generate the SSB test signal, which is inserted into a reception path of a receiver at a test signal injection point. The reception path comprises a mixer configured to mix the SSB test signal with the local oscillator signal to generate a down-converted, intermediate frequency output signal. The output signal may be analyzed to determine errors in the reception path.
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Citations
17 Claims
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1. A receiver circuit, comprising:
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a test signal generation component configured to generate a single side band (SSB) test signal independent from a signal received by a reception path of the receiver circuit, wherein the test signal generation component comprises; a SSB signal generator configured to generate an IQ baseband signal having an in-phase signal component and a quadrature phase signal component; first and second magnitude setting blocks located downstream of the SSB signal generator and respectively configured to selectively vary a magnitude of the in-phase signal component based upon a first amplitude setting word and to vary a magnitude of the quadrature phase signal component based upon a second amplitude setting word; and an IQ modulator configured to receive the IQ baseband signal and to generate the SSB test signal by modulating the IQ baseband signal onto a local oscillator signal, a test signal injection point configured to provide the SSB test signal to the reception path of the receiver circuit; and a mixer located within the reception path at a location downstream of the test signal injection point, the mixer configured to mix the SSB test signal with the local oscillator signal to generate a down-converted output signal indicative of an error in the reception path. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A circuit, comprising:
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a single sideband (SSB) signal generator having a digital clock input configured to receive a low frequency digital clock signal, wherein the SSB signal generator is configured to generate in-phase and quadrature phase signal components of a baseband IQ signal, comprising a sequence of constellation points, from the low frequency digital clock signal; first and second magnitude setting blocks located downstream of the SSB signal generator and respectively configured to selectively vary a magnitude of the in-phase signal component based upon a first amplitude setting word and to vary a magnitude of the quadrature phase signal component based upon a second amplitude setting word; an IQ modulator configured to modulate the baseband IQ signal onto a local oscillator signal to generate a single sideband (SSB) test signal; one or more reception paths coupled to an antenna and respectively configured to receive one or more RF signals; one or more couplers in direct communication with the one or more reception paths and configured to provide the SSB test signal to the one or more reception paths; and one or more mixers respectively disposed within the one or more reception paths at a location downstream of the one or more couplers, the one or more mixers configured to mix the SSB test signal with the local oscillator signal to generate one or more output signals indicative of an error in the reception paths. - View Dependent Claims (13, 14)
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15. A method for testing one or more reception paths of a receiver circuit, comprising:
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generating a single sideband (SSB) test signal independent from an RF signal received by the receiver circuit, wherein generating the SSB test signal comprises; generating an IQ baseband signal having an in-phase component and a quadrature phase component; selectively adjusting an amplitude of the IQ baseband signal, prior to modulation onto a local oscillator signal, by adjusting an amplitude of the in-phase component or the quadrature phase component using one or more amplitude setting words; and modulating the IQ baseband signal onto the local oscillator signal to generate the SSB test signal, injecting the SSB test signal into a reception path configured to receive the RF signal; and down-converting the SSB test signal using the local oscillator signal to generate an output signal indicative of an error in the one or more reception paths. - View Dependent Claims (16, 17)
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Specification