Abstract:
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 gm is converted to ...Show MoreMetadata
Abstract:
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 gm 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 samples to implement active finite-impulse-response (FIR) filtering while simultaneously offering variable-gain amplification. This integration happens on the DAC capacitance of a 2x interleaved 10 bit successive approximation (SAR) ADC, which finally quantizes the filtered signal at a maximum rate of 300 MS/s. The 28 nm prototype achieves +10 dBm IIP3, 2 nV/√Hz input-referred noise and 52 dB gain range while consuming a maximum power of 15 mW.
Published in: IEEE Journal of Solid-State Circuits ( Volume: 51, Issue: 7, July 2016)