Double-operational-amplifier elliptic function and inverse Chebyshev active low-pass filter circuit

An inverse Chebyshev, low-pass filter technology, applied in the field of analog microelectronics, can solve the problems of poor circuit symmetry and stability, small dispersion of component values, and large circuit volume, etc. The effect of cost, power consumption reduction, and circuit size reduction
CN112769412AActive Publication Date: 2021-05-07ηŽ‹θ‡΄εŽ
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Patent Information

Authority / Receiving Office
CN Β· China
Current Assignee / Owner
ηŽ‹θ‡΄εŽ
Publication Date
2021-05-07

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Abstract

The invention discloses an inverse Chebyshev active low-pass filter circuit with a double-operational-amplifier elliptic function. The circuit comprises a signal input end Vs, a signal output end Vo and an input and output signal common end GND, and is characterized by further comprising a resistor Rq1, a resistor Rq2, a resistor Ra, a resistor Rb, a resistor Rd, a resistor Ri, a resistor Ro, a capacitor Ca, a capacitor Cb, an operational amplifier U1A and an operational amplifier U1B, and one end of the resistor Rq1, one end of the resistor Ri and one end of the capacitor Ca are connected to a node p1, which serves as the input end which is connected to an input signal Vi; the other end of the resistor Rq1, the other end of the capacitor Ca, one end of the resistor Rq2, one end of the resistor Ra and the in-phase input end of the operational amplifier U1A are connected to a node p2; and the other end of the resistor Rq2 is connected to the input and output signal common end GND. The circuit is good in symmetry, stable in performance and easy to design and use, one to two operational amplifiers are saved compared with a 3 or 4 operational amplifier state variable elliptic function filter, power consumption is reduced, the size of the circuit is reduced, and the cost of the filter and the circuit is reduced.
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Description

technical field

[0001] The invention relates to the technical field of analog microelectronics, in particular to a circuit using two operational amplifiers to form an elliptic function and an inverse Chebyshev active filter. Background technique

[0002] Active filters are an important part of electronic circuit signal conditioning technology, and are widely used in electronic circuits such as communication technology, instrumentation, industrial measurement and control, and military electronics to eliminate out-of-band noise of signals and electronic equipment. The transfer function forms of active filters mainly include Butterworth filter, Chebyshev filter, inverse Chebyshev filter, and elliptic function filter, and their frequency characteristics can be divided into low-pass filter, high-pass filter, band-pass filter, band-stop filter. Its circuit composition is divided into single op amp circuit, double op amp circuit, three op amp circuit, and four op amp circuit accor...

Claims

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