Multi channel self-test for RF devices
First Claim
1. A radio frequency (RF) device comprising:
- a plurality of mixers, each of the plurality of mixers having a first input terminal, a second input terminal, and an output terminal; and
a self-test circuit comprising;
a buffer having an input terminal and an output terminal, the buffer configured to buffer a reference signal from a local oscillator (LO) to produce a first RF signal at a first frequency; and
a plurality of delay elements having different respective transmission delays, the delay elements each having a first end coupled to the output terminal of the buffer and a second end configured to provide a respective delayed signal based on the first RF signal, wherein the self-test circuit is configured to, in a test mode, couple the second ends of the delay elements to respective first input terminals of the plurality of mixers to provide each mixer with the respective delayed signal, and wherein the second input terminals of the mixer are configured to receive a second RF signal having the first frequency.
1 Assignment
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Accused Products
Abstract
A radio frequency (RF) device includes a plurality of mixers, each of the plurality of mixers having a first input terminal, a second input terminal, and an output terminal; and a self-test circuit. The self-test circuit includes a buffer having an input terminal and an output terminal, the buffer configured to buffer a reference signal from a local oscillator (LO) to produce a first RF signal at a first frequency; and a plurality of delay elements having different respective transmission delays, the delay elements each having a first end coupled to the output terminal of the buffer and a second end configured to provide a respective delayed signal based on the first RF signal, where the self-test circuit is configured to, in a test mode, couple the second ends of the delay elements to respective first input terminals of the plurality of mixers to provide each mixer with the respective delayed signal, and where the second input terminals of the mixer are configured to receive a second RF signal having the first frequency.
14 Citations
20 Claims
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1. A radio frequency (RF) device comprising:
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a plurality of mixers, each of the plurality of mixers having a first input terminal, a second input terminal, and an output terminal; and a self-test circuit comprising; a buffer having an input terminal and an output terminal, the buffer configured to buffer a reference signal from a local oscillator (LO) to produce a first RF signal at a first frequency; and a plurality of delay elements having different respective transmission delays, the delay elements each having a first end coupled to the output terminal of the buffer and a second end configured to provide a respective delayed signal based on the first RF signal, wherein the self-test circuit is configured to, in a test mode, couple the second ends of the delay elements to respective first input terminals of the plurality of mixers to provide each mixer with the respective delayed signal, and wherein the second input terminals of the mixer are configured to receive a second RF signal having the first frequency. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of operating a radio frequency (RF) device having a plurality of mixers, the method comprising:
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buffering an RF reference signal from an local oscillator (LO) to produce a first RF signal using a buffer, the RF reference signal having a first frequency; delaying the first RF signal by a plurality of delay elements having different respective transmission delays to provide a plurality of respective delayed signals; in a test mode, coupling outputs of the plurality of delay elements to corresponding first inputs of a plurality of mixers; and mixing, using the plurality of mixers, the plurality of respective delayed signals with a second RF signal having the first frequency. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A method of operating a radio frequency (RF) device, the method comprising:
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generating a reference RF signal using a local oscillator (LO) of the RF device; buffering the reference RF signal using a buffer of the RF device, the buffer having a first pre-determined phase shift, thereby introducing the first pre-determined phase shift between the reference RF signal and a first RF signal at an output terminal of the buffer; passing the first RF signal through a plurality of RF paths having different transmission delays to generate a plurality of delayed RF signals, each of the delayed RF signals having a different phase shift from the first RF signal; feeding, in a test mode, the delayed RF signals to respective first input terminals of a plurality of mixers of the RF device; feeding a second RF signal derived from the reference RF signal to respective second input terminals of the plurality of mixers, the second RF signal and the first RF signal having a same frequency; and measuring first outputs at output terminals of the plurality of mixers. - View Dependent Claims (18, 19, 20)
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Specification