CMOS linear-in-dB VGA with DC offset cancellation for direct-conversion receivers

Lei Qianqian; Chen Zhiming; Shi Yin; Chu Xiaojie; Gong Zheng

doi:10.1088/1674-4926/32/10/105008

J. Semicond. > 2011, Volume 32 > Issue 10 > 105008

SEMICONDUCTOR INTEGRATED CIRCUITS

CMOS linear-in-dB VGA with DC offset cancellation for direct-conversion receivers

Lei Qianqian, Chen Zhiming, Shi Yin, Chu Xiaojie and Gong Zheng

+ Author Affiliations

DOI: 10.1088/1674-4926/32/10/105008

Abstract: A low-power high-linearity linear-in-dB variable gain amplifier (VGA) with novel DC offset calibration loop for direct-conversion receiver (DCR) is proposed. The proposed VGA uses the differential-ramp based technique; a digitally programmable gain amplifier (PGA) can be converted to an analog controlled dB-linear VGA. An operational amplifier (OPAMP) utilizing an improved Miller compensation approach is adopted in this VGA design. The proposed VGA shows a 57 dB linear range. The DC offset cancellation (DCOC) loop is based on a continuous-time feedback that includes the Miller effect and a linear range operation MOS transistor to realize high-value capacitors and resistors to solve the DC offset problem, respectively. The proposed approach requires no external components and demonstrates excellent DCOC capability in measurement. Fabricated using SMIC 0.13 μm CMOS technology, this VGA dissipates 4.5 mW from a 1.2 V supply voltage while occupying 0.58 mm² of chip area including bondpads. In addition, the DCOC circuit shows 500 Hz high pass cutoff frequency (HPCF) and the measured residual DC offset at the output of VGA is less than 2 mV.

Key words: linear-in-dB, VGA, DC offset cancellation

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Lei Qianqian, Chen Zhiming, Shi Yin, Chu Xiaojie, Gong Zheng. CMOS linear-in-dB VGA with DC offset cancellation for direct-conversion receivers[J]. Journal of Semiconductors, 2011, 32(10): 105008. doi: 10.1088/1674-4926/32/10/105008

Lei Q Q, Chen Z M, Shi Y, Chu X J, Gong Z. CMOS linear-in-dB VGA with DC offset cancellation for direct-conversion receivers[J]. J. Semicond., 2011, 32(10): 105008. doi: 10.1088/1674-4926/32/10/105008.

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Received: 20 August 2015 Revised: 14 June 2011 Online: Published: 01 October 2011

A low-power high-linearity linear-in-dB variable gain amplifier (VGA) with novel DC offset calibration loop for direct-conversion receiver (DCR) is proposed. The proposed VGA uses the differential-ramp based technique; a digitally programmable gain amplifier (PGA) can be converted to an analog controlled dB-linear VGA. An operational amplifier (OPAMP) utilizing an improved Miller compensation approach is adopted in this VGA design. The proposed VGA shows a 57 dB linear range. The DC offset cancellation (DCOC) loop is based on a continuous-time feedback that includes the Miller effect and a linear range operation MOS transistor to realize high-value capacitors and resistors to solve the DC offset problem, respectively. The proposed approach requires no external components and demonstrates excellent DCOC capability in measurement. Fabricated using SMIC 0.13 μm CMOS technology, this VGA dissipates 4.5 mW from a 1.2 V supply voltage while occupying 0.58 mm² of chip area including bondpads. In addition, the DCOC circuit shows 500 Hz high pass cutoff frequency (HPCF) and the measured residual DC offset at the output of VGA is less than 2 mV.

CMOS linear-in-dB VGA with DC offset cancellation for direct-conversion receivers

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CMOS linear-in-dB VGA with DC offset cancellation for direct-conversion receivers

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CMOS linear-in-dB VGA with DC offset cancellation for direct-conversion receivers

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