LC filter | || Circuit design of filter and attenuator || || || 1. Design of filter image parameter method || || A filter is a typical frequency selection circuit. In a given frequency band, it can theoretically allow the signal to pass through the circuit without attenuation. This section is called || passband. Other signals outside the passband will be greatly attenuated. The frequency band with great attenuation is called stopband. The boundary frequency between passband and stopband is called cutoff frequency. The basic requirements for filters are: (1) The attenuation of signals in the passband should be small, and the attenuation of signals in the stopband should be large. The attenuation characteristics of the transition from the passband to the stopband rise sharply; (2) The characteristic impedance in the passband should be constant to facilitate impedance matching. || The classification of filters is as follows: || Filters: 1. Passive filters 2. Active filters, || Passive filters are further divided into: RC filters...
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