On 05/20/2018 09:13 PM, li...@lazygranch.com wrote:
Can you be more specific about the corner frequency?
Corner frequencies step-tunable from perhaps 20Mhz down to perhaps 2MHz.
Many chips, like the R820T2, the MAX2112, and the higher-integration
devices like the AD9361 and LMS7002M have
programmable analog low-pass corner frequencies, for bandwidth
tailoring of the complex baseband.
Just not sure how its done. The chips have very low external parts
count, so whatever it is, it's got to be done
internally...
Cell phones use chips that have switchable banks of capacitors for
antenna tuning. st.com IIRC is a source.
I used to design switched capacitor filter chips in the 80/90s. The
technology was killed by oversampled converters and DSP. The SCF
players went into continuous time video filters using transconductance
amps and such.
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