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公开(公告)号：US20210305968A1
公开(公告)日：2021-09-30
申请号：US17216942
申请日：2021-03-30
申请人： Anlotek Limited
发明人： Jorgen Staal Nielsen
摘要： A variable filter for an RF circuit has a signal loop comprising a signal input port and a signal output port, and a plurality of circuit elements connected within the signal loop. The plurality of circuit elements comprise a multi-pole resonator comprising a plurality of frequency tunable resonators and an adjustable scaling block that applies a gain factor. Adjacent frequency tunable resonators within the multi-pole resonator are reciprocally coupled. A controller is connected to tune the multi-pole resonator and to adjust the gain factor of the adjustable scaling block such that the signal loop generates a desired bandpass response.
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公开(公告)号：US11909400B2
公开(公告)日：2024-02-20
申请号：US17782103
申请日：2020-12-04
申请人： Anlotek Limited
发明人： Jorgen Staal Nielsen
IPC分类号： H03H7/01 , H03K5/1252 , H03H7/12
CPC分类号： H03K5/1252 , H03H7/0161 , H03H7/12
摘要： A method and apparatus for generating an RF signal uses digital signal components to generate a synthesized RF signal having a plurality of frequency components. An analog filter is used to filter the synthesized RF signal. The analog filter is a tunable, active feedback circuit having one or more variable resonators and a variable gain block connected in a signal loop that is defined by a passband. The analog filter is tuned such that the passband of the analog filter overlaps one or more desired frequency components of the plurality of frequency components of the synthesized RF signal, and such that the passband has a relative bandwidth of about 1% or less.
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公开(公告)号：US20180323770A1
公开(公告)日：2018-11-08
申请号：US16031911
申请日：2018-07-10
申请人： Anlotek Limited
CPC分类号： H03H11/1208 , H03G3/3042 , H03H11/1291 , H03H2210/012 , H03H2210/015
摘要： A variable filter has a signal loop defined between a signal input and a signal output. A plurality of circuit elements connected in the signal loop, the plurality of circuit elements comprising a frequency tunable resonator, and an adjustable scaling block that applies a gain factor that is adjustable in a range that comprises a positive gain and a negative gain. A controller is connected to 1) tune the frequency tunable resonator; and to 2) adjust the gain factor of the adjustable scaling block between a negative gain factor to a positive gain factor providing for variable Q independent of frequency.
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公开(公告)号：US20220376671A1
公开(公告)日：2022-11-24
申请号：US17743387
申请日：2022-05-12
申请人： Anlotek Limited
发明人： Jorgen Staal Nielsen
摘要： An RF signal is tuned by: producing a first signal at a first frequency using a digital sequence generator; filtering the first signal using a frequency-tunable tracking filter that is tuned to the first frequency, the tracking filter comprising one or more variable resonators; tuning the tracking filter from the first frequency to a second frequency over a transition period; and tuning the first signal to the second frequency by causing the digital sequence generator to transition between two or more states during the transition period. The two or more states are selected such that, immediately after the transition period, the analog signal substantially matches a desired steady state at the second frequency.
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公开(公告)号：US20220376670A1
公开(公告)日：2022-11-24
申请号：US17733936
申请日：2022-04-29
申请人： Anlotek Limited
发明人： Jorgen Staal Nielsen
IPC分类号： H03H7/00
摘要： An active feedback RF resonator has a signal loop having a signal input and a signal output. The signal loop has a variable gain stage and at least one variable resonator, each variable resonator comprising an inductance element and a variable capacitance element comprising a number of switched fixed value capacitors and a variable capacitor. A phase noise of the active feedback RF signal has a maximum value for an operating frequency of the variable resonator that is based on an operating range of the variable capacitor.
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公开(公告)号：US20210391849A1
公开(公告)日：2021-12-16
申请号：US17348556
申请日：2021-06-15
申请人： Anlotek Limited
发明人： Jorgen Staal Nielsen
摘要： A method of stabilizing a variable filter for an analog electromagnetic signal against circuit oscillation includes the steps of: providing a signal loop comprising a signal input, a signal output, and a plurality of variable circuit elements connected in the signal loop, the plurality of variable circuit elements comprising an adjustable resonator and an adjustable gain block, the signal loop having a variable frequency response that is characterized by a central frequency, a frequency passband, a response Q, and an operating point and a resonator response curve that are plottable in a Cartesian s-plane having an origin, a real axis, and an imaginary axis; and maintaining stability of the variable filter within an operating range by controlling the adjustable resonator and the adjustable gain block such that, in the Cartesian s-plane, the resonator response curve satisfies an orthogonality stability condition.
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公开(公告)号：US12126314B2
公开(公告)日：2024-10-22
申请号：US17216942
申请日：2021-03-30
申请人： Anlotek Limited
发明人： Jorgen Staal Nielsen
CPC分类号： H03H11/12 , H03G3/3036
摘要： A variable filter for an RF circuit has a signal loop comprising a signal input port and a signal output port, and a plurality of circuit elements connected within the signal loop. The plurality of circuit elements comprise a multi-pole resonator comprising a plurality of frequency tunable resonators and an adjustable scaling block that applies a gain factor. Adjacent frequency tunable resonators within the multi-pole resonator are reciprocally coupled. A controller is connected to tune the multi-pole resonator and to adjust the gain factor of the adjustable scaling block such that the signal loop generates a desired bandpass response.
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公开(公告)号：US20230361719A1
公开(公告)日：2023-11-09
申请号：US18245135
申请日：2021-09-14
申请人： Anlotek Limited
发明人： Jorgen Staal Nielsen
CPC分类号： H03B5/1293 , H03B5/04 , H03B5/1823
摘要： An oscillator has a feedback loop with a signal output, a multi-pole resonator, and a gain block. The gain block applies a gain sufficient to generate a stable oscillation signal at the signal output; and the multi-pole resonator is tunable between two or more resonance modes.
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公开(公告)号：US20230006662A1
公开(公告)日：2023-01-05
申请号：US17782103
申请日：2020-12-04
申请人： Anlotek Limited
发明人： Jorgen Staal Nielsen
IPC分类号： H03K5/1252
摘要： A method and apparatus for generating an RF signal uses digital signal components to generate a synthesized RF signal having a plurality of frequency components. An analog filter is used to filter the synthesized RF signal. The analog filter is a tunable, active feedback circuit having one or more variable resonators and a variable gain block connected in a signal loop that is defined by a passband. The analog filter is tuned such that the passband of the analog filter overlaps one or more desired frequency components of the plurality of frequency components of the synthesized RF signal, and such that the passband has a relative bandwidth of about 1% or less.
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公开(公告)号：US11290084B2
公开(公告)日：2022-03-29
申请号：US16616926
申请日：2018-05-24
申请人： Anlotek Limited
摘要： A method and apparatus for modifying or controlling a resonator connected to a signal loop having an input (18828), an output (18822), and a closed loop frequency response. The signal loop has a primary resonator (18810) having a primary frequency response. There is at least one adjustable resonator (18812) having an adjustable frequency (f) and a secondary Q-factor. An adjustable scaling block (18824) applies a gain factor (g). A controller is connected to the at least one adjustable resonator (18812) and the adjustable scaling block (18824). The controller has instructions to adjust the closed loop frequency response toward a desired closed loop frequency response by controlling the adjustable frequency (f) of the at least one adjustable resonator (18812) and the gain factor (g) of the adjustable scaling block (18824).
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