CN113892236A - Filter and circuit for a transmit channel - Google Patents

Filter and circuit for a transmit channel Download PDF

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Publication number
CN113892236A
CN113892236A CN201980096930.2A CN201980096930A CN113892236A CN 113892236 A CN113892236 A CN 113892236A CN 201980096930 A CN201980096930 A CN 201980096930A CN 113892236 A CN113892236 A CN 113892236A
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impedance
network
filter
modulator
output signal
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CN113892236B (en
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缪卫明
杨帆
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/02—Transmitters
    • H04B1/04—Circuits

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Transmitters (AREA)

Abstract

The application provides a filter and a circuit for a transmit channel, the filter for providing a signal to be modulated to a modulator, comprising: a first filtering component; a first tuning component comprising an impedance-tunable first network coupled with the first filtering component; and the controller is used for adjusting the impedance of the first network according to a first output signal of the modulator, wherein the first output signal is generated after the modulator modulates a first signal to be modulated. The filter can correspondingly adjust the impedance of the first network according to the first output signal of the modulator, so that the flexibility of the filter is improved.

Description

Filter and circuit for a transmit channel Technical Field
The present application relates to the electrical arts, and more particularly, to a filter and circuit for a transmit channel.
Background
With the development of the fifth Generation mobile communication (5th Generation, 5G) technology, operators can provide large-bandwidth, multi-channel base station chips to meet the application requirements of large-scale mimo. In the multi-channel chip, a transmission channel adopts a zero intermediate frequency architecture, a filter and a modulator both adopt a passive architecture, wherein if a Local Oscillator (LO) of the modulator adopts a duty ratio of 25%, theoretically, the energy difference between an output fundamental frequency signal of the modulator and a third harmonic signal is 9.5dB, and after the modulator outputs the fundamental frequency signal and the third harmonic energy and simultaneously enters a post-amplifier, the linearity of the post-amplifier is deteriorated. Therefore, the power consumption of the post-amplifier needs to be increased to meet the requirement of the post-amplifier on linearity, which is not favorable for the design requirement of low power consumption and energy saving of the whole chip.
Disclosure of Invention
A filter and a circuit for a transmit path are provided to improve the linearity of a post amplifier without increasing the power consumption of the post amplifier.
In a first aspect, a filter is provided for providing a signal to be modulated to a modulator, comprising: a first filtering component; a first tuning component comprising an impedance-tunable first network coupled with the first filtering component; and the controller is used for adjusting the impedance of the first network according to a first output signal of the modulator, wherein the first output signal is generated after the modulator modulates the first signal to be modulated.
In the scheme of the filter provided in the embodiment of the application, compared with a conventional filter, the impedance of the first network in the filter can be correspondingly adjusted according to the first output signal of the modulator, so that the flexibility of the filter is improved.
With reference to the first aspect, in a possible implementation manner, the filter further includes a serial peripheral interface SPI, and the controller adjusts the impedance of the first network through the SPI.
With reference to the first aspect, in one possible implementation manner, the controller is specifically configured to adjust the impedance of the first network to decrease as the frequency of the first output signal of the modulator increases.
Under the condition that the frequency of the first output signal of the modulator is increased, the controller adjusts the impedance of the first network to be reduced, so that the output impedance of the filter is adjusted to be matched with the frequency of the first output signal of the modulator, and the flexibility of the filter is improved.
With reference to the first aspect, in one possible implementation manner, the first filtering component includes at least one inductor.
With reference to the first aspect, in a possible implementation manner, a first end of the first adjusting component is grounded, and a second end of the first adjusting component is connected to an output end of the first filtering component.
With reference to the first aspect, in a possible implementation manner, the filter further includes: a second filtering component comprising at least one inductor; and the second adjusting assembly comprises a second network with adjustable impedance, the third end of the second adjusting assembly is grounded, and the fourth end of the second adjusting assembly is connected with the output end of the second filtering assembly.
With reference to the first aspect, in a possible implementation manner, the controller is further configured to adjust the impedance of the first network and the impedance of the second network according to a first output signal of the modulator and a second output signal of the modulator, where the second output signal is generated after the modulator modulates the second signal to be modulated.
In the filter scheme provided in the embodiment of the present application, the controller may correspondingly adjust the impedance of the first network in the filter and the impedance of the second network in the filter according to the first output signal and the second output signal of the modulator, so as to improve the flexibility of the filter.
With reference to the first aspect, in one possible implementation manner, the controller adjusts the impedance of the second network through the SPI.
With reference to the first aspect, in a possible implementation manner, the controller is further specifically configured to adjust the impedance of the first network to decrease and the impedance of the second network to decrease as a frequency of the first output signal of the modulator increases and a frequency of the second output signal of the modulator increases.
Under the condition that the frequency of the first output signal of the modulator is increased and the frequency of the second output signal of the modulator is increased, the controller adjusts the impedance reduction of the first network and the impedance reduction of the second network, the adjustment of the output impedance of the filter, the frequency of the first output signal of the modulator and the frequency of the second output signal of the modulator in a matched mode is achieved, and the flexibility of the filter is improved. With reference to the first aspect, in a possible implementation manner, the first network includes a first element and/or a first adjustable capacitor, where the first element is a first adjustable resistor or a first adjustable fet.
With reference to the first aspect, in a possible implementation manner, the second network includes a second element and/or a second adjustable capacitor, where the second element is a second adjustable resistor or a second adjustable fet.
With reference to the first aspect, in a possible implementation manner, the filter further includes: and a fifth end of the third adjustable resistor is connected with the second end, and a sixth end of the third adjustable resistor is connected with the fourth end.
With reference to the first aspect, in a possible implementation manner, the controller is further configured to control a sum of the third adjustable resistor and the impedance of the first network to be a target impedance, or a sum of the third adjustable resistor and the impedance of the second network to be a target impedance.
In a second aspect, a circuit for a transmit channel is provided, comprising: a modulator; a filter, the filter comprising: a first filtering component; a first tuning component comprising an impedance-tunable first network coupled with the first filtering component; and the controller is used for adjusting the impedance of the first network according to a first output signal of the modulator, wherein the first output signal is generated after the modulator modulates the first signal to be modulated.
In the scheme of the circuit for the transmission channel provided in the embodiment of the application, the controller can correspondingly adjust the impedance of the first network in the filter according to the first output signal of the modulator, so that the design of low power consumption of the circuit is met, and the production cost of the circuit is reduced.
With reference to the second aspect, in a possible implementation manner, the filter further includes a serial peripheral interface SPI, and the controller adjusts the impedance of the first network through the SPI.
With reference to the second aspect, in one possible implementation manner, the controller is specifically configured to adjust the impedance of the first network to decrease as the frequency of the first output signal of the modulator increases.
With reference to the second aspect, in one possible implementation manner, the first filtering component includes at least one inductor.
With reference to the second aspect, in a possible implementation manner, the first end of the first adjusting component is grounded, and the second end of the first adjusting component is connected to the output end of the first filtering component.
With reference to the second aspect, in a possible implementation manner, the filter further includes: a second filtering component comprising at least one inductor; and the second adjusting assembly comprises a second network with adjustable impedance, the third end of the second adjusting assembly is grounded, and the fourth end of the second adjusting assembly is connected with the output end of the second filtering assembly.
With reference to the second aspect, in a possible implementation manner, the controller is further configured to adjust an impedance of the first network and an impedance of the second network according to a frequency of a first output signal of the modulator and a second output signal of the modulator, where the second output signal is generated after the modulator modulates the second signal to be modulated.
In the circuit scheme for the transmit channel provided in the embodiment of the present application, the controller may adjust the impedance of the first network in the filter and the impedance of the second network in the filter according to the first output signal and the second output signal of the modulator, so as to meet the design of low power consumption of the circuit for the transmit channel, and reduce the production cost of the circuit for the transmit channel.
With reference to the second aspect, in one possible implementation manner, the controller adjusts the impedance of the second network through the SPI.
With reference to the second aspect, in one possible implementation manner, the controller is further specifically configured to adjust the impedance of the first network to decrease and the impedance of the second network to decrease as the frequency of the first output signal of the modulator increases and the frequency of the second output signal of the modulator increases.
With reference to the second aspect, in a possible implementation manner, the first network includes a first element and/or a first adjustable capacitor, where the first element is a first adjustable resistor or a first adjustable fet.
With reference to the second aspect, in a possible implementation manner, the second network includes a second element and/or a second adjustable capacitor, where the second element is a second adjustable resistor or a second adjustable fet.
With reference to the second aspect, in a possible implementation manner, the filter further includes: and a fifth end of the third adjustable resistor is connected with the second end, and a sixth end of the third adjustable resistor is connected with the fourth end.
With reference to the second aspect, in a possible implementation manner, the controller is further configured to control a sum of the third adjustable resistor and the impedance of the first network to be a target impedance, or a sum of the third adjustable resistor and the impedance of the second network to be a target impedance.
With reference to the second aspect, in one possible implementation manner, the circuit further includes: and the output end of the oscillator outputs the third harmonic.
In a third aspect, a chip system is provided, which includes the filter in the first aspect and any one of the possible implementation manners of the first aspect.
In a fourth aspect, a chip system is provided, which includes the circuit for a transmit channel in the second aspect and any one of the possible implementations of the second aspect.
Drawings
Fig. 1 shows a schematic diagram of the transmit architecture in a single channel chip.
Fig. 2 shows a block schematic diagram of the transmit internal circuitry in a single channel chip.
Fig. 3 is a schematic structural diagram of a circuit 300 for a transmit channel according to an embodiment of the present disclosure.
Detailed Description
The technical solution in the present application will be described below with reference to the accompanying drawings.
To facilitate understanding of the embodiments of the present application, a brief description will first be made of several concepts referred to hereinafter.
1. Passive elements: the common characteristic of the resistor type, the inductor type and the capacitor type elements is that the circuit can work under the condition of a signal without a power supply.
2. Inductance is a property of a closed loop and is a physical quantity. When the coil passes through the current, magnetic field induction is formed in the coil, and the induced magnetic field can generate induction current to resist the current passing through the coil. This interaction of the current with the coil is known as the inductive reactance of the electricity. The inductive reactance XL is calculated by the following formula: XL ═ ω L ═ 2 pi fL where ω is the angular frequency, L is the coil inductance, and f is the operating frequency. It can be seen from the calculation formula of the inductance, as the frequency increases, the inductance of the inductor also increases, i.e. the resistance of the inductor to the high-frequency signal increases. In other words, the inductor may act as a barrier to high frequency signals in the high frequency circuit, with higher frequencies providing greater resistance.
3. The modulator is a device that modulates a low-frequency signal into a high-frequency signal by a digital signal processing technology to perform signal transmission. A modulator is generally used to modulate two input signals (e.g., a signal to be modulated output by a positive phase (I) and a signal to be modulated output by a quadrature (Q)). The frequency of the output signal of the modulator is equal to the sum, difference or other combination of the two input signal frequencies. The modulator also needs to receive a local oscillator signal from a voltage controlled oscillator, and the circuit of the modulator completely operates in a radio frequency band.
If the local oscillator of the modulator adopts a duty ratio of 25%, theoretically, the energy difference between the output fundamental frequency signal of the modulator and the third harmonic is 9.5dB, and after the output fundamental frequency signal of the modulator and the energy of the third harmonic enter the post-stage amplifier at the same time, the linearity of the post-stage amplifier is deteriorated, so that the power consumption of the post-stage amplifier needs to be increased to meet the requirement of the system on the linearity.
Fig. 1 shows a schematic diagram of the transmit architecture in a single channel chip. As shown in fig. 1, the transmit architecture in the single-channel chip includes two input signals, i.e., in-phase (I) and quadrature (Q). Each channel includes a digital-to-analog converter (DAC) 110, a filter 120, a modulator 130, and an amplifier 140. The following describes each component by taking the same path as an example. The DAC 110 converts the digital signal into an analog signal and transmits the analog signal to the low pass filter 120, and the low pass filter 120 allows a baseband signal lower than a cutoff frequency among the analog signal to pass but does not allow a signal higher than the cutoff frequency to pass. The modulator 130 modulates the baseband signal output by the low pass filter 120 and the local oscillator LO signal output by the oscillator 150 into a high frequency signal, and the modulator 130 converts the input baseband signal into a high frequency rf signal. The high frequency radio frequency signal enters the amplifier 140, and the amplifier 140 may amplify the high frequency radio frequency signal.
Fig. 2 shows a block schematic diagram of the transmit internal circuitry in a single channel chip. As shown in phantom in fig. 2, may be one possible implementation of filter 120 in fig. 1. The filter may be composed of a differential circuit having two input terminals, one of the two input terminals is a positive (e.g., P-pole) input terminal, the other input terminal is a negative (e.g., N-pole) input terminal, and signals input to the two input terminals may be a first baseband signal to be processed and a second baseband signal to be processed, respectively, where the phase difference between the first baseband signal to be processed and the second baseband signal to be processed is 90 °. The filter 120 may be a passive filter, that is, the passive filter is composed of an inductor and a capacitor, and the filter may be a fifth-order filter, that is, each path in the differential circuit of the fifth-order filter may include two inductors and three capacitors, that is, two inductors are L1122 and L2124, and three capacitors are 121, 123, and 125, respectively; alternatively, the two inductors are L1 ', L2 ', and the three capacitors are 121 ', 123 ', 125 ', respectively. The filter also includes an adjustable resistor R1, and the baseband signal to be processed is filtered by the passive filter 120.
Fig. 3 is a schematic structural diagram of a circuit 300 for a transmit channel according to an embodiment of the present application. As shown in fig. 3, the circuit 300 for the transmit channel includes:
a modulator 130;
a filter comprising a first filtering component 310. The first filter component 310 may comprise at least one inductor, and the filtered first signal to be modulated output from the output of the first filter component 310 is input to the external modulator 130. For example, as shown in fig. 3, the first filter component 310 includes 3 inductors, i.e., the 3 inductors are inductor L1, inductor L2, and inductor Ls, respectively. The filter may further include a first adjusting component 320, the first adjusting component 320 may include a first network with adjustable impedance, a first end of the first adjusting component 320 is connected to ground, and a second end of the first adjusting component 320 is connected to an output terminal of the first filtering component 310. The first network may include a first element and/or a first adjustable capacitor, where the first element is a first adjustable resistor or a first adjustable fet. For example, as shown in fig. 3, the first element may be a first adjustable resistor Rp, and the first adjustable capacitor Cp. The filter may further comprise a controller 340 for adjusting the impedance of the first network according to a first output signal of the modulator 130, wherein the first output signal is generated by modulating the first signal to be modulated by the modulator.
Alternatively, the controller 340 may be a processor, such as a CPU.
Optionally, the controller 340 is specifically configured to control the impedance of the first network to decrease as the frequency of the first output signal of the modulator 130 increases.
Optionally, the filter may further include a Serial Peripheral Interface (SPI), and the controller 340 adjusts the impedance of the first network through the SPI. Optionally, the circuit for the transmit channel may further include an oscillator 150, and a signal output by the oscillator 150 is an LO local oscillation signal and a harmonic signal thereof.
The controller 340 may control the impedance of the first network 320 to decrease by controlling the impedance according to the increase of the frequency of the first output signal so that the energy difference between the frequency of the first output signal and the frequency of the third harmonic output by the oscillator 150 may be greater than or equal to a first threshold, which may be greater than or equal to 13dB, for example, the first threshold may be 13dB, and the first threshold may also be 14 dB. This can suppress the influence of the high frequency signal of the third harmonic at the output of the modulator 130 on the linearity of the cascaded amplifier 330, i.e., the signal input to the amplifier 330 is amplified by the amplifier 330, and the signal input to the amplifier 330 is not distorted.
Optionally, the filter may further include a second filtering component 310 ', the second filtering component 310' may include at least one inductor, and the filtered second signal to be modulated output by the output of the second filtering component is input to the external modulator 130. For example, as shown in fig. 3, the second filter component 310 'includes 3 inductors, i.e., the 3 inductors are inductor L1', inductor L2 ', and inductor Ls', respectively. The circuit 300 for the transmit channel may further include a second adjusting component 320 ', the second adjusting component 320' including a second network with adjustable impedance, a third terminal of the second adjusting component being connected to ground, and a fourth terminal of the second adjusting component being connected to an output terminal of the second filtering component. The second network may include a second element and/or a second adjustable capacitor, where the second element is a second adjustable resistor or a second adjustable fet. For example, as shown in fig. 3, the second element is a second adjustable resistor Rp ', and the second adjustable capacitor is Cp'.
Optionally, the controller 340 is further configured to adjust the impedance of the first network and the impedance of the second network according to the first output signal of the modulator 130 and a second output signal of the modulator 130, where the second output signal is generated after the modulator 130 modulates the second signal to be modulated.
Optionally, the filter 300 may also adjust the impedance of the second network through the SPI described above.
Optionally, the controller 340 is further specifically configured to adjust the impedance reduction of the first network 320 and the impedance reduction of the second network 320' as the frequency of the first output signal of the modulator 130 increases and the frequency of the second output signal of the modulator 130 increases.
The controller 340 may make an energy difference of the frequency of the first output signal and the frequency of the third harmonic output from the oscillator 150 greater than or equal to a first threshold, which may be greater than or equal to 13dB, for example, 13dB, and the first threshold may also be 14dB, by controlling the impedance of the first network 320 and the impedance of the second network 320' to decrease according to the increase in the frequency of the first output signal and the increase in the frequency of the second output signal. Meanwhile, the energy difference between the frequency of the second output signal and the frequency of the third harmonic output by the oscillator 150 may be greater than or equal to a second threshold, where the second threshold may be equal to the first threshold. The second threshold is equal to or greater than 13dB, for example, the second threshold may be 13dB, and the second threshold may also be 14 dB. This can suppress the influence of the high frequency signal of the third harmonic at the output of the modulator 130 on the linearity of the cascaded amplifier 330, i.e., the signal input to the amplifier 330 is amplified by the amplifier 330, and the signal input to the amplifier 330 is not distorted.
Optionally, the filter may further include a third adjustable resistor R1. The fifth end of the R1 is connected to the second end, and the sixth end of the R1 is connected to the fourth end.
Optionally, the controller 340 is further configured to adjust the impedance of the first network and the impedance of the third adjustable resistor R1 according to the frequency of the signal at the output end of the modulator 130, that is, the controller 340 adjusts the impedance of the second network and the impedance of the third adjustable resistor R1 according to the frequency of the first output signal, and maintains the target impedance at different operating frequencies, where the sum of the impedance of the first network and the impedance of the third adjustable resistor R1 is a target impedance, and the sum of the impedance of the second network and the impedance of the third adjustable resistor R1 is a target impedance. Where the operating frequency is understood to be the frequency of the signal at the output of the modulator, the target impedance is determined by the operating frequency.
Wherein the impedance value Z of the first network satisfies formula (1):
Figure PCTCN2019090348-APPB-000001
where ω is the angular frequency of the first output signal, ω is 2 pi f, and f is the operating frequency; l issIs an inductance LsThe inductance value of (a); cpIs the capacitance value of a first tunable capacitor in the first network; rpIs the resistance value of the first element.
Wherein the impedance value Z' of the second network satisfies the following formula (2):
Figure PCTCN2019090348-APPB-000002
where ω 'is the angular frequency of the second output signal, ω' 2 pi f1，f 1Is the operating frequency; l'sIs inductance L'sThe inductance value of (a); c'pIs the capacitance value of a second tunable capacitor in the second network; r'pIs the resistance value of the second element.
Wherein the target impedance is:
Figure PCTCN2019090348-APPB-000003
alternatively, the target impedance is:
Figure PCTCN2019090348-APPB-000004
the controller 340 may implement the adjustment of the operating frequency in coordination with the impedance value of the first network and the operating frequency in coordination with the impedance value of the second network according to equations (1) and (2). The controller 340 may implement the sum of the impedance value of the first network and the impedance of the third adjustable resistor R1 as the target impedance according to equation (3); the controller 340 may achieve the sum of the impedance value of the second network and the impedance of the third adjustable resistor R1 as the target impedance according to equation (4). Therefore, the energy difference between the signal (the first output signal and the second output signal) at the output port of the modulator and the third harmonic wave is not lower than 13dB under different frequency bands, the linearity of the post-amplifier 330 is improved, and the low-power-consumption design of the channel is realized.
For example, when the operating frequency is 1.8GHz or 2.1GHz, the controller 340 may control the resistance of the third adjustable resistor R1 to be small, control the impedance value of the first network to be relatively large, and make the impedance values of the third adjustable resistor R1 and the first network satisfy formula (3). Meanwhile, the controller 340 may control the resistance of the third adjustable resistor R1 to be small, control the impedance value of the second network to be relatively large, and make the impedance values of R1 and the second network satisfy according to formula (4); for another example, when the operating frequency is 3.5GHz or 4.9GHz, the controller 340 may control the resistance of the third adjustable resistor R1 to be larger or not to be accessed (open circuit), control the impedance value of the first network and the impedance value of the second network to be relatively smaller, and make the impedance values of R1 and the first network satisfy formula (3); meanwhile, the controller 340 may control the resistance of the third adjustable resistor R1 to be larger or not to be accessed (open circuit), control the impedance value of the second network to be relatively smaller, and make the impedance values of R1 and the second network satisfy according to equation (4). So that at different operating frequencies the sum of the impedance value of the first network and the impedance value of the third adjustable resistor R1 is constant and the sum of the impedance value of the second network and the impedance value of the third adjustable resistor R1 is constant. Therefore, the energy difference between the signal frequency of the output port of the modulator and the third harmonic frequency under different frequency bands is not lower than 13dB, and the low-power-consumption design of the channel is realized.
The embodiment of the present application further provides a filter, which is described as the filter in the circuit for transmitting channels, and is not described in detail herein.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (28)

  1. A filter for providing a signal to be modulated to a modulator, comprising:
    a first filtering component;
    a first tuning component comprising an impedance-tunable first network coupled with the first filtering component;
    and the controller is used for adjusting the impedance of the first network according to a first output signal of the modulator, wherein the first output signal is generated after the modulator modulates a first signal to be modulated.
  2. The filter of claim 1, further comprising a Serial Peripheral Interface (SPI), wherein the controller adjusts the impedance of the first network via the SPI.
  3. The filter according to claim 1 or 2, wherein the controller is specifically configured to adjust the impedance of the first network to decrease as the frequency of the first output signal of the modulator increases.
  4. The filter of claim 1, wherein the first filtering component comprises at least one inductor.
  5. The filter of claim 1, wherein a first terminal of the first adjusting component is connected to ground and a second terminal of the first adjusting component is connected to an output terminal of the first filtering component.
  6. The filter of any one of claims 1 to 5, further comprising:
    a second filtering component comprising at least one inductor;
    and the second adjusting assembly comprises a second network with adjustable impedance, the third end of the second adjusting assembly is grounded, and the fourth end of the second adjusting assembly is connected with the output end of the second filtering assembly.
  7. The filter of claim 6, wherein the controller is further configured to adjust the first network impedance and the second network impedance according to a first output signal of the modulator and a second output signal of the modulator, and the second output signal is generated after the modulator modulates the second signal to be modulated.
  8. The filter of claim 7, wherein the controller adjusts the impedance of the second network via the SPI.
  9. The filter of claim 7 or 8, wherein the controller is further configured to adjust the impedance of the first network to decrease and the impedance of the second network to decrease as the frequency of the first output signal of the modulator increases and the frequency of the second output signal of the modulator increases.
  10. The filter according to any of claims 1 to 3, wherein the first network comprises a first element and/or a first adjustable capacitor, wherein the first element is a first adjustable resistor or a first adjustable field effect transistor.
  11. The filter according to any of claims 6 to 9, wherein the second network comprises a second element and/or a second adjustable capacitance, wherein the second element is a second adjustable resistance or a second adjustable field effect transistor.
  12. The filter of any one of claims 1 to 11, further comprising:
    and a fifth end of the third adjustable resistor is connected with the second end, and a sixth end of the third adjustable resistor is connected with the fourth end.
  13. The filter of any of claims 1 to 12, wherein the controller is further configured to control a sum of the third adjustable resistance and the impedance of the first network to be a target impedance, or a sum of the third adjustable resistance and the impedance of the second network to be a target impedance.
  14. A circuit for a transmit channel, comprising:
    a modulator;
    a filter, the filter comprising:
    a first filtering component;
    a first tuning component comprising an impedance-tunable first network coupled with the first filtering component;
    the controller is used for adjusting the impedance of the first network according to a first output signal of the modulator, wherein the first output signal is generated after the modulator modulates a first signal to be modulated.
  15. The circuit of claim 14, wherein the filter further comprises a Serial Peripheral Interface (SPI), and wherein the controller adjusts the impedance of the first network via the SPI.
  16. A circuit as claimed in claim 14 or 15, wherein the controller is arranged in particular to adjust the impedance of the first network to decrease as the frequency of the first output signal of the modulator increases.
  17. The circuit of claim 14, wherein the first filtering component comprises at least one inductor.
  18. The circuit of claim 14, wherein a first terminal of the first adjusting component is coupled to ground and a second terminal of the first adjusting component is coupled to an output of the first filtering component.
  19. The circuit of any one of claims 14 to 18, wherein the filter further comprises:
    a second filtering component comprising at least one inductor;
    and the second adjusting assembly comprises a second network with adjustable impedance, the third end of the second adjusting assembly is grounded, and the fourth end of the second adjusting assembly is connected with the output end of the second filtering assembly.
  20. The circuit of claim 19, wherein the controller is further configured to adjust the impedance of the first network and the impedance of the second network according to a first output signal of the modulator and a second output signal of the modulator, and the second output signal is generated after the modulator modulates the second signal to be modulated.
  21. The circuit of claim 20, wherein the controller adjusts the impedance of the second network via the SPI.
  22. The circuit of claim 20 or 21, wherein the controller is further configured to adjust the impedance of the first network to decrease and the impedance of the second network to decrease as the frequency of the first output signal of the modulator increases and the frequency of the second output signal of the modulator increases.
  23. The circuit of any of claims 14 to 16, wherein the first network comprises a first element and/or a first adjustable capacitance, wherein the first element is a first adjustable resistance or a first adjustable fet.
  24. The circuit of any of claims 19 to 22, wherein the second network comprises a second element and/or a second adjustable capacitance, wherein the second element is a second adjustable resistance or a second adjustable fet.
  25. The circuit of any one of claims 14 to 24, wherein the filter further comprises:
    and a fifth end of the third adjustable resistor is connected with the second end, and a sixth end of the third adjustable resistor is connected with the fourth end.
  26. The circuit of any of claims 14 to 25, wherein the controller is further configured to control a sum of the impedance of the third adjustable resistor and the first network to be a target impedance, or a sum of the impedance of the third adjustable resistor and the second network to be a target impedance.
  27. The circuit of any one of claims 14 to 26, further comprising:
    and the output end of the oscillator outputs the third harmonic.
  28. A chip system comprising a filter according to any one of claims 1 to 13 or comprising a circuit for a transmit channel according to any one of claims 14 to 27.
CN201980096930.2A 2019-06-06 2019-06-06 Filter and circuit for a transmit channel Active CN113892236B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2019/090348 WO2020243949A1 (en) 2019-06-06 2019-06-06 Filter and circuit for transmitting channel

Publications (2)

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CN113892236A true CN113892236A (en) 2022-01-04
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US6844763B1 (en) * 2002-08-29 2005-01-18 Analog Devices, Inc. Wideband modulation summing network and method thereof
CN1833356A (en) * 2002-08-29 2006-09-13 模拟设备股份有限公司 Method and system for modulation gain calibration
CN101882911A (en) * 2010-04-30 2010-11-10 苏州英诺迅科技有限公司 Filter circuit for improving linearity and power added efficiency of power amplifier
CN103155431A (en) * 2010-08-26 2013-06-12 维斯普瑞公司 Tunable radio front end and methods
CN103166595A (en) * 2011-12-09 2013-06-19 北京北方微电子基地设备工艺研究中心有限责任公司 Impedance matcher, semiconductor equipment and impedance matching method
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