FBM214 | FOXBORO | Fourth order dual channel filter

Description

FBM214 | FOXBORO | Fourth order dual channel filter

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For example, Linglilt’s LT6604-10 fourth-order dual channel filter/FBM214 driver has approximately 70dB attenuation between 90MHz and 100MHz. Whether this attenuation is sufficient depends on the power value received at a frequency 90MHz away from the center frequency, and for many applications, such attenuation may be sufficient. The use of surface acoustic wave (SAW) filters in the RF domain can reduce the need for suppression of aliasing frequency bands. The low-pass filter integrated in the FBM214 demodulator can reduce out of band filtering requirements, but it is often in the range of 250MHz to 400MHz and is only effective in suppressing LO or RF feedthrough. After the active low-pass filter, there should be some additional suppression beyond 50MHz to suppress the noise in the driver section, which may persist outside the transition band.

In direct conversion, due to mirror frequency suppression limitations, FBM214 gain and phase mismatch limit the achievable parasitic free dynamic range (SFDR). This issue is often underestimated as simply correcting the two variables of gain and phase. In terms of high mirror frequency suppression, complex mismatches in passband ripple and delays within the frequency band of interest must be corrected. Differential filters may exhibit highly localized characteristics in passband phase and amplitude response due to differences in tolerance between corresponding components, thus requiring more complex correction. When approaching the passband edge of high-order low-pass filters, simple time-domain correction may become unmanageable.

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