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A discrete-time (DT) analog baseband for software-defined-radio (SDR) receivers is presented. A zero-IF baseband signal at the input of a programmable $\mathrm {g}_{\mathrm {m}}$ is converted to current, which is integrated on a 5th-order DT infinite-impulse response (IIR) low-pass filter with a bandwidth ranging from 150 kHz to 80 MHz. The IIR is followed by a DT amplifier which integrates selected...
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