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Complex filter

A complex filter and filter circuit technology, which is applied in the field of communication, can solve the problems of increased area, poor consistency, filter center frequency, and large change in quality factor, etc., to achieve the effect of reducing area and cost

Pending Publication Date: 2022-05-27
SHANGHAI PANCHIP MICROELECTRONICS CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

First of all, larger capacitors and resistors are often required when smaller bandwidths and lower center frequencies are required, resulting in increased area; secondly, with different batches of processes or different positions of wafers in the same batch, the resistance and capacitance will vary. Less than 10% of the difference, resulting in the center frequency, quality factor, bandwidth and other parameters of the filter vary greatly with the process, and the consistency is poor

Method used

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Embodiment Construction

[0016] In order to make the above-mentioned objects, features and advantages of the present invention more clearly understood, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0017] refer to figure 2 , figure 2 It is a schematic diagram of the Tow-Thomas circuit structure with a zero-adjusting resistor. As shown in the figure, the resistor RC1 and the resistor RC2 are zero-adjusting resistors, and the resistance values ​​of the resistors R1, R2, R3, R4, RC1, and RC2 are R respectively. 1 , R 2 , R 3 , R 4 , R C1 , R C2 , the capacitance values ​​of the shown capacitors RC1RC2 are R C1 , R C2 .

[0018] The system function is:

[0019]

[0020] The eigenfrequency is:

[0021]

[0022] The quality factor is:

[0023]

[0024] Compared with the traditional Tow-Thomas circuit structure, it can be found that the characteristic frequency with the zero-adjusting resistor has two more...

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Abstract

The filter is formed by the Tow-Thomas circuit structure with the zero-setting resistor, so that the area of the resistor and the capacitor can be effectively reduced under the same indexes such as center frequency, bandwidth, quality factor and the like, and the cost is reduced. Secondly, the resistor and capacitor array arrangement proposed in the embodiment of the invention can adjust the center frequency and bandwidth on the premise that the quality factor is basically unchanged, thereby overcoming the problem of poor consistency of the filter.

Description

technical field [0001] The present invention relates to the technical field of communications, and in particular, to a complex filter. Background technique [0002] The filter has the function of frequency selection. Tow-Thomas circuit is a simple circuit to realize filter, which can realize low-pass, high-pass and band-pass filter by external resistance and capacitance and the change of output port. Therefore, it is widely used in filter circuits. Its circuit form is as figure 1 , the resistance values ​​of the resistors R1, R2, R3, and R4 shown are R 1 , R 2 , R 3 , R 4 , the capacitance values ​​of the shown capacitors C1 and C2 are C respectively 1 , C 2 . [0003] The transfer function of the system is: [0004] Its characteristic frequency is: [0005] Its quality factor is: [0006] There are many problems with traditional Tow-Thomas circuits. First, when a smaller bandwidth and a lower center frequency are required, larger capacitors and resistors ...

Claims

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Application Information

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IPC IPC(8): H03H17/02
CPCH03H17/02Y02E40/40
Inventor 邓金鸣黄继成
Owner SHANGHAI PANCHIP MICROELECTRONICS CO LTD
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