Re: [Discuss-gnuradio] An analog RF question

[Marcus D. Leech]

On 05/20/2018 09:13 PM, address@hidden 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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