Analysis and Design of a 5 GS/s Analog Charge-Domain FFT for an SDR Front-End in 65 nm CMOS

作者：Sadhu Bodhisatwa^*; Sturm Martin; Sadler Brian M; Harjani Ramesh

来源：IEEE Journal of Solid-State Circuits, 2013, 48(5): 1199-1211.

DOI：10.1109/JSSC.2013.2250457

• Analytical models
• analog integrated circuits
• channel bank filters
• cognitive radio
• demodulation
• discrete cosine transforms
• discrete Fourier transforms
• fast Fourier transforms
• FET integrated circuits
• filtering
• FIR filters
• integrated circuit modeling
• integrated circuit noise
• linear circuits
• mixed analog digital integrated circuits
• modulation
• MOS integrated circuits
• multiplying circuits
• multiple signal classification
• OFDM
• passive circuits
• passive filters
• phase shifters
• radio-frequency integrated circuits
• radio spectrum management
• RF signals
• sampled data circuits
• signal analysis
• signal detection
• signal to noise ratio
• software defined radio
• software radio
• spectral analysis
• signal sampling
• summing circuits
• switched capacitor
• switched circuits
• transforms
• very high speed integrated circuits

This work describes the design of a 16 point analog domain FFT using a Charge Re-use Analog Fourier Transform (CRAFT) engine. The circuit relies on charge re-use to achieve 47 dB average output SNDR on an instantaneous input bandwidth of 5 GHz, and consumes only 3.8 mW (12.2 pJ/conv.). The CRAFT engine is used as a wide-band, low power RF front-end channelizer for software defined radio (SDR) applications. The paper also discusses the handling of circuit non-idealities for the CRAFT design: their significance, modeling, and circuit techniques for their mitigation. These techniques enable this implementation to achieve a large dynamic range even at high speeds.

• 出版日期2013-5