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This paper presents a programmable gain amplifier(PGA) circuit with a digitally assisted DC offset cancellation(DCOC) scheme for a direct conversion WLAN receiver.Implemented in a standard 0.13-μm CMOS process,the PGA occupies 0.39 mm2 die area and dissipates 6.5 mW power from a 1.2 V power supply.By using a single loop single digital-to-analog converter(DAC) mixed signal DC offset cancellation topology,the minimum DCOC settling time achieved is as short as 1.6μs with the PGA gain ranging from -8 to 54 dB in a 2 dB step.The DCOC loop utilizes a segmented DAC structure to lower the design complexity without sacrificing accuracy and a digital control algorithm to dynamically set the DCOC loop to fast or normal response mode,making the PGA circuit in compliance with the targeted WLAN specifications.
This paper presents a programmable gain amplifier (PGA) circuit with a digitally assisted DC offset cancellation (DCOC) scheme for a direct conversion WLAN receiver. Implemented in a standard 0.13-μm CMOS process, the PGA occupies 0.39 mm2 die area and dissipates 6.5 mW power from a 1.2 V power supply. By using a single loop single digital-to-analog converter (DAC) mixed signal DC offset cancellation topology, the minimum DCOC settling time achieved is as short as 1.6 μs with the PGA gain ranging from -8 to 54 dB in a 2 dB step. DCOC loop utilizes a segmented DAC structure to lower the design complexity without sacrificing accuracy and a digital control algorithm to dynamically set the DCOC loop to fast or normal response mode, making the PGA circuit in compliance with the targeted WLAN specifications.