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KR-20260063599-A - A CIRCUIT SYSTEM FOR RECEIVING SIGNALS AND A SELF-BIASING ADAPTIVE FILTER

KR20260063599AKR 20260063599 AKR20260063599 AKR 20260063599AKR-20260063599-A

Abstract

A circuit system for receiving a signal and a self-biasing adaptive filter are provided. The circuit system includes a low-noise amplifier; and a self-biasing adaptive filter, wherein the self-biasing adaptive filter includes a frequency splitter network; an adaptive biasing rectifier connected to the frequency splitter network via a transmission line; and an active resonance circuit connected to the frequency splitter network and the adaptive biasing rectifier via a transmission line, wherein the active resonance circuit may be connected to the low-noise amplifier through the base of the low-noise amplifier and the collector of the low-noise amplifier.

Inventors

  • 서철헌
  • 우규식

Assignees

  • 대한민국(방위사업청장)

Dates

Publication Date
20260507
Application Date
20241030

Claims (10)

  1. In a circuit system that receives a signal, low-noise amplifier; and It includes a self-biasing adaptive filter, The above self-bias adaptive filter is, frequency splitter network; An adaptive biasing rectifier connected to the above frequency split network and transmission line; and It includes the above frequency split network and the active resonance circuit connected to the above adaptive bias rectifier and transmission line, and The above active resonant circuit is, A circuit system connected to the low-noise amplifier through the base of the low-noise amplifier and the collector of the low-noise amplifier.
  2. In paragraph 1, The above signal is, Includes a transmission band signal and a reception band signal, The above-mentioned reception band signal is, A circuit system corresponding to the second harmonic of the above-mentioned transmission band signal.
  3. In paragraph 2, The above frequency split network is, It is configured to separate the transmission band signal and the reception band signal, and The above separated transmission band signal is, It is transferred to the above adaptive bias rectifier, and The above separated reception band signal is, A circuit system transmitted to the above active resonant circuit.
  4. In paragraph 2, The above frequency split network is, A circuit system configured to separate the transmission band signal and the reception band signal based on the impedance adjustment of the transmission line.
  5. In paragraph 2, The above adaptive bias rectifier is, A circuit system configured to convert the above transmission band signal into DC power.
  6. In paragraph 5, The above adaptive bias rectifier is, A circuit system configured to convert the transmission band signal into the DC power based on a diode included in the adaptive bias rectifier.
  7. In paragraph 5, A circuit system configured to drive the active resonant circuit based on the above DC power.
  8. In paragraph 2, The above active resonant circuit is, A circuit system configured to have a center frequency corresponding to the frequency of the above-mentioned receiving band signal.
  9. In paragraph 2, The above active resonant circuit is, It is set to amplify the above-mentioned reception band signal based on bandwidth adjustment, and The above bandwidth is, A circuit system that is dynamically adjusted in response to received power input to the above circuit system.
  10. In a self-bias adaptive filter that amplifies a signal, frequency splitter network; An adaptive biasing rectifier connected to the above frequency split network and transmission line; and A self-biasing adaptive filter comprising the above frequency split network and an active resonance circuit connected to the above adaptive bias rectifier and transmission line.

Description

A circuit system for receiving signals and a self-biasing adaptive filter The present disclosure relates to a circuit system for receiving a signal and a self-bias adaptive filter, and more specifically, to a circuit system for receiving a signal and a self-bias adaptive filter for application in a radar system for nonlinear object detection. Conventional radar systems, due to their characteristic of simultaneously amplifying both transmit band and receive band signals, may struggle with nonlinear detection in environments where the transmit band signal is strongly received. In particular, passive filters used in conventional radar systems possess fixed cutoff characteristics for signals across all bands regardless of the transmit band strength; consequently, when the transmit band signal is high, it becomes difficult to effectively suppress it, which can lead to distortion of the receive band signal. On the other hand, while active filters can provide variable cutoff characteristics, they may have disadvantages such as requiring additional power, complex circuit design, and increased power consumption. These issues can limit the detection of small electronic devices with nonlinear characteristics in nonlinear detection radar systems. Accordingly, the present disclosure proposes a circuit system including a self-biasing adaptive filter for effectively suppressing a transmit band signal and amplifying a receive band signal to improve the signal-to-noise ratio in a nonlinear detection radar system. FIG. 1 shows a circuit system according to one embodiment. FIG. 2 shows a detailed circuit diagram of a circuit system according to one embodiment. FIG. 3 is a diagram illustrating the process of obtaining an equivalent circuit of an active resonant circuit according to one embodiment. FIG. 4 shows an actual implementation example of a circuit system according to one embodiment. FIG. 5 is a diagram for explaining the comparison of the output voltage of an adaptive bias rectifier according to one embodiment based on the received power. FIG. 6 is a diagram for explaining the S-parameters of a circuit system according to one embodiment by comparing them based on simulation and measurement results. FIG. 7 is a diagram for explaining the gain of a circuit system according to one embodiment by comparing it according to the received power. FIG. 8 is a diagram illustrating the input third-order crossover point in the receiving band signal of a circuit system according to one embodiment in comparison with a conventional amplifier. FIG. 9 is a diagram for explaining the noise figure of a circuit system according to one embodiment by comparing it with frequency. The following embodiments are combinations of the components and features of various embodiments in a predetermined form. Each component or feature may be considered optional unless otherwise explicitly stated. Each component or feature may be implemented in a form not combined with other components or features. Additionally, various embodiments may be constructed by combining some components and features. The order of operations described in various embodiments may be changed. Some components or features of one embodiment may be included in another embodiment, or may be replaced with corresponding components or features of another embodiment. In the description of the drawings, procedures or steps that could obscure the essence of the various embodiments were not described, nor were procedures or steps that can be understood by a person of ordinary knowledge in the relevant technical field described. Throughout the specification, when a part is described as "comprising" or "including" a component, this means that, unless specifically stated otherwise, it does not exclude other components but may include additional components. Furthermore, terms such as "...part," "...unit," and "module" as used in the specification refer to a unit that performs at least one function or operation, and this may be implemented in hardware, software, or a combination of hardware and software. Additionally, "one (a or an)," "one," "the," and similar related terms may be used in the context describing various embodiments (particularly in the context of the following claims) in both singular and plural forms, unless otherwise indicated in the specification or clearly contradicted by the context. Hereinafter, preferred embodiments according to various examples will be described in detail with reference to the accompanying drawings. The detailed description disclosed below, together with the accompanying drawings, is intended to describe exemplary embodiments of various examples and is not intended to represent the only embodiment. In addition, specific terms used in various embodiments are provided to aid in understanding the various embodiments, and the use of such specific terms may be modified in other forms within the scope of not departing from the technical concept of the various embod