A 150 kHz-80 MHz BW DT analog baseband for SDR RX using a 5th-order IIR LPF, active FIR and 10b 300 MS/s ADC in 28nm CMOS

A 150 kHz-80 MHz BW DT analog baseband for SDR RX using a 5th-order IIR LPF, active FIR and 10b 300 MS/s ADC in 28nm CMOS ■

Badr Malki, Badr Malki, Badr Malki, Bob Verbruggen, Bob Verbruggen, Bob Verbruggen, Ewout Martens, Ewout Martens, Ewout Martens, Piet Wambacq, Piet Wambacq, Piet Wambacq, Jan Craninckx, Jan Craninckx, Jan Craninckx

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 IIR filter with a bandwidth ranging from 150 kHz to 80 MHz. The IIR is followed by a DT amplifier which integrates freely selectable samples to implement active FIR filtering while simultaneously offering variable-gain amplification. This integration happens on the DAC capacitance of a 2x interleaved 10b 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/VHz IRN and 52 dB gain range while consuming a maximum power of 15 mW.