Low-1/F-noise local oscillator for non-overlapping differential I/Q signals
The present invention relates to a circuit arrangement (300) for generating non-overlapping and immune-to-1/f-noise signals as has been described. A break-before-make (BBM) circuit ensures that the differential I/Q signals (LO-0, LO-90, LO-180, LO-270), driving the transistors (M11, M12, M21, M22) o...
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| creator | JEURISSEN DENNIS DE JONG GERBEN W |
| description | The present invention relates to a circuit arrangement (300) for generating non-overlapping and immune-to-1/f-noise signals as has been described. A break-before-make (BBM) circuit ensures that the differential I/Q signals (LO-0, LO-90, LO-180, LO-270), driving the transistors (M11, M12, M21, M22) of mixers (16A, 16B) in an RF receiver (200), are non-over-lapping for having at any time only one of these transistors turned on. The duty cycle of each driving signal is measured, and the difference ( ) in the duty cycle corresponding to two subsequent LO phases is determined through a respective differential amplifier (38A-38D). Each differential amplifier is configured to have a current output (LT-0, LT-90, LT-180, LT-270), which is then fed back to the input of the input buffer (30A-30D) corresponding to the first LO phase in order to adjust its logic threshold (LT) level and make the difference ( ) equal to zero. Thereby, the combined action of the BBM circuit and the feedback loops results in four non-overlapping differential I/Q signals (LO-0, LO-90, LO-180, LO-270) with constant and mutually equal duty cycles, and fixed and well-defined relative positions. |
| format | Patent |
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A break-before-make (BBM) circuit ensures that the differential I/Q signals (LO-0, LO-90, LO-180, LO-270), driving the transistors (M11, M12, M21, M22) of mixers (16A, 16B) in an RF receiver (200), are non-over-lapping for having at any time only one of these transistors turned on. The duty cycle of each driving signal is measured, and the difference ( ) in the duty cycle corresponding to two subsequent LO phases is determined through a respective differential amplifier (38A-38D). Each differential amplifier is configured to have a current output (LT-0, LT-90, LT-180, LT-270), which is then fed back to the input of the input buffer (30A-30D) corresponding to the first LO phase in order to adjust its logic threshold (LT) level and make the difference ( ) equal to zero. Thereby, the combined action of the BBM circuit and the feedback loops results in four non-overlapping differential I/Q signals (LO-0, LO-90, LO-180, LO-270) with constant and mutually equal duty cycles, and fixed and well-defined relative positions.</description><language>eng</language><subject>BASIC ELECTRONIC CIRCUITRY ; ELECTRIC COMMUNICATION TECHNIQUE ; ELECTRICITY ; GENERATION OF NOISE BY SUCH CIRCUITS ; GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING,BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN ANON-SWITCHING MANNER ; PULSE TECHNIQUE ; TRANSMISSION</subject><creationdate>2014</creationdate><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&date=20140325&DB=EPODOC&CC=US&NR=8680929B2$$EHTML$$P50$$Gepo$$Hfree_for_read</linktohtml><link.rule.ids>230,308,776,881,25542,76289</link.rule.ids><linktorsrc>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&date=20140325&DB=EPODOC&CC=US&NR=8680929B2$$EView_record_in_European_Patent_Office$$FView_record_in_$$GEuropean_Patent_Office$$Hfree_for_read</linktorsrc></links><search><creatorcontrib>JEURISSEN DENNIS</creatorcontrib><creatorcontrib>DE JONG GERBEN W</creatorcontrib><title>Low-1/F-noise local oscillator for non-overlapping differential I/Q signals</title><description>The present invention relates to a circuit arrangement (300) for generating non-overlapping and immune-to-1/f-noise signals as has been described. A break-before-make (BBM) circuit ensures that the differential I/Q signals (LO-0, LO-90, LO-180, LO-270), driving the transistors (M11, M12, M21, M22) of mixers (16A, 16B) in an RF receiver (200), are non-over-lapping for having at any time only one of these transistors turned on. The duty cycle of each driving signal is measured, and the difference ( ) in the duty cycle corresponding to two subsequent LO phases is determined through a respective differential amplifier (38A-38D). Each differential amplifier is configured to have a current output (LT-0, LT-90, LT-180, LT-270), which is then fed back to the input of the input buffer (30A-30D) corresponding to the first LO phase in order to adjust its logic threshold (LT) level and make the difference ( ) equal to zero. 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A break-before-make (BBM) circuit ensures that the differential I/Q signals (LO-0, LO-90, LO-180, LO-270), driving the transistors (M11, M12, M21, M22) of mixers (16A, 16B) in an RF receiver (200), are non-over-lapping for having at any time only one of these transistors turned on. The duty cycle of each driving signal is measured, and the difference ( ) in the duty cycle corresponding to two subsequent LO phases is determined through a respective differential amplifier (38A-38D). Each differential amplifier is configured to have a current output (LT-0, LT-90, LT-180, LT-270), which is then fed back to the input of the input buffer (30A-30D) corresponding to the first LO phase in order to adjust its logic threshold (LT) level and make the difference ( ) equal to zero. Thereby, the combined action of the BBM circuit and the feedback loops results in four non-overlapping differential I/Q signals (LO-0, LO-90, LO-180, LO-270) with constant and mutually equal duty cycles, and fixed and well-defined relative positions.</abstract><oa>free_for_read</oa></addata></record> |
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| subjects | BASIC ELECTRONIC CIRCUITRY ELECTRIC COMMUNICATION TECHNIQUE ELECTRICITY GENERATION OF NOISE BY SUCH CIRCUITS GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING,BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN ANON-SWITCHING MANNER PULSE TECHNIQUE TRANSMISSION |
| title | Low-1/F-noise local oscillator for non-overlapping differential I/Q signals |
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