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公开(公告)号：US20210167999A1
公开(公告)日：2021-06-03
申请号：US17247491
申请日：2020-12-14
摘要： Apparatus and methods related to multipath bandpass filters with passband notches are provided herein. In certain configurations, a multipath bandpass filter includes multiple filter circuit branches or paths that are electrically connected in parallel with one another between an input terminal and an output terminal. The input terminal receives an input signal, and each filter circuit branch includes a downconverter that downconverts the input signal to generate a downconverted signal, a filter network that generates a filtered signal by filtering the downconverted signal, and an upconverter that upconverts the filtered signal to generate a branch output signal. The filter network includes at least one low pass filter and at least one notch filter to provide a passband with in-band notches. The branch output signals from the filter circuit branches are combined to generate an output signal at the output terminal.
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公开(公告)号：US10965502B2
公开(公告)日：2021-03-30
申请号：US16565023
申请日：2019-09-09
摘要： Multipath filters are provided herein. In certain configurations, a multipath filter includes multiple filter paths or circuit branches that are electrically connected in parallel with one another between an input terminal and an output terminal. The input terminal receives an input signal, and each filter circuit branch includes a double-in double-switched (DIDS) downconverter that downconverts the input signal with two different clock signal phases to generate a downconverted signal. Each filter circuit branch further includes a filter network that generates a filtered signal by filtering the downconverted signal and an upconverter that upconverts the filtered signal to generate a branch output signal. Additionally, the branch output signals from the filter circuit branches are combined to generate an output signal at the output terminal.
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公开(公告)号：US10461705B2
公开(公告)日：2019-10-29
申请号：US15922134
申请日：2018-03-15
摘要： Apparatus and methods for oscillation suppression of cascode power amplifiers are provided herein. In certain implementations, a power amplifier system includes a cascode power amplifier including a plurality of transconductance devices that operate in combination with a plurality of cascode devices to amplify a radio frequency input signal. The power amplifier system further includes a bias circuit that biases the plurality of cascode devices with two or more bias voltages that are decoupled from one another at radio frequency to thereby inhibit the cascode power amplifier from oscillating.
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公开(公告)号：US10454724B2
公开(公告)日：2019-10-22
申请号：US15902190
申请日：2018-02-22
摘要： Multipath filters are provided herein. In certain configurations, a multipath filter includes multiple filter paths or circuit branches that are electrically connected in parallel with one another between an input terminal and an output terminal. The input terminal receives an input signal, and each filter circuit branch includes a double-in double-switched (DIDS) downconverter that downconverts the input signal with two different clock signal phases to generate a downconverted signal. Each filter circuit branch further includes a filter network that generates a filtered signal by filtering the downconverted signal and an upconverter that upconverts the filtered signal to generate a branch output signal. Additionally, the branch output signals from the filter circuit branches are combined to generate an output signal at the output terminal.
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公开(公告)号：US09362925B2
公开(公告)日：2016-06-07
申请号：US14718677
申请日：2015-05-21
CPC分类号： H03L7/1974 , H03L7/087 , H03L7/0891 , H03L7/0895 , H03L7/0898 , H03L7/093 , H03L7/099 , H03L7/197 , H03L7/1976 , H03L7/1978 , H04L7/0016 , H04L7/0045 , H04W56/0035 , H04W88/02
摘要： Disclosed are circuits and method for reducing or eliminating reference spurs in frequency synthesizers. In some implementations, a phase-locked loop (PLL) such as a Frac-N PLL of a frequency synthesizer can include a phase frequency detector (PFD) configured to receive a reference signal and a feedback signal. The PFD can be configured to generate a first signal representative of a phase difference between the reference signal and the feedback signal. The PLL can further include a compensation circuit configured to generate a compensation signal based on the first signal. The PLL can further includes a voltage-controlled oscillator (VCO) configured to generate an output signal based on the compensation signal. The compensation signal can include at least one feature for substantially eliminating one or more reference spurs associated with the PLL.
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公开(公告)号：US20130308735A1
公开(公告)日：2013-11-21
申请号：US13870742
申请日：2013-04-25
CPC分类号： H03L7/1974 , H03L7/087 , H03L7/0891 , H03L7/0895 , H03L7/0898 , H03L7/093 , H03L7/099 , H03L7/197 , H03L7/1976 , H03L7/1978 , H04L7/0016 , H04L7/0045 , H04W56/0035 , H04W88/02
摘要： Disclosed are circuits and method for reducing or eliminating reference spurs in frequency synthesizers. In some implementations, a phase-locked loop (PLL) such as a Frac-N PLL of a frequency synthesizer can include a phase frequency detector (PFD) configured to receive a reference signal and a feedback signal. The PFD can be configured to generate a first signal representative of a phase difference between the reference signal and the feedback signal. The PLL can further include a compensation circuit configured to generate a compensation signal based on the first signal. The PLL can further includes a voltage-controlled oscillator (VCO) configured to generate an output signal based on the compensation signal. The compensation signal can include at least one feature for substantially eliminating one or more reference spurs associated with the PLL.
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公开(公告)号：US20210104983A1
公开(公告)日：2021-04-08
申请号：US17124913
申请日：2020-12-17
IPC分类号： H03F3/21 , H03F3/24 , H03F3/193 , H03F1/02 , H03F1/22 , H03F1/32 , H03F3/72 , H03F3/68 , H03F3/195
摘要： Apparatus and methods for oscillation suppression of cascode power amplifiers are provided herein. In certain implementations, a power amplifier system includes a cascode power amplifier including a plurality of transconductance devices that operate in combination with a plurality of cascode devices to amplify a radio frequency input signal. The power amplifier system further includes a bias circuit that biases the plurality of cascode devices with two or more bias voltages that are decoupled from one another at radio frequency to thereby inhibit the cascode power amplifier from oscillating.
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公开(公告)号：US10897381B2
公开(公告)日：2021-01-19
申请号：US16598890
申请日：2019-10-10
摘要： Apparatus and methods related to multipath bandpass filters with passband notches are provided herein. In certain configurations, a multipath bandpass filter includes multiple filter circuit branches or paths that are electrically connected in parallel with one another between an input terminal and an output terminal. The input terminal receives an input signal, and each filter circuit branch includes a downconverter that downconverts the input signal to generate a downconverted signal, a filter network that generates a filtered signal by filtering the downconverted signal, and an upconverter that upconverts the filtered signal to generate a branch output signal. The filter network includes at least one low pass filter and at least one notch filter to provide a passband with in-band notches. The branch output signals from the filter circuit branches are combined to generate an output signal at the output terminal.
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公开(公告)号：US10484211B2
公开(公告)日：2019-11-19
申请号：US15906155
申请日：2018-02-27
摘要： Apparatus and methods related to multipath bandpass filters with passband notches are provided herein. In certain configurations, a multipath bandpass filter includes multiple filter circuit branches or paths that are electrically connected in parallel with one another between an input terminal and an output terminal. The input terminal receives an input signal, and each filter circuit branch includes a downconverter that downconverts the input signal to generate a downconverted signal, a filter network that generates a filtered signal by filtering the downconverted signal, and an upconverter that upconverts the filtered signal to generate a branch output signal. The filter network includes at least one low pass filter and at least one notch filter to provide a passband with in-band notches. The branch output signals from the filter circuit branches are combined to generate an output signal at the output terminal.
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公开(公告)号：US10432241B2
公开(公告)日：2019-10-01
申请号：US16191218
申请日：2018-11-14
摘要： A power amplifier circuit includes a transistor having a first terminal that is configured to receive an input signal, a second terminal electrically coupled to ground, and a third terminal configured to transmit a combined amplified signal. The power amplifier circuit further includes a combining signal input path electrically coupled to the second terminal and configured to receive a combining signal and provide the combining signal to the second terminal of the transistor to generate, at least in part, the combined amplified signal.
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