Abstract
A wideband current amplifier with DC-offset cancellation utilizing chopper modulation is proposed. Combining series–series feedback with backgate driven choppers, a wideband current amplifier with DC-offset cancellation is realized. As consumed a power of 1.495 mW under a supply voltage of 1.8 V, measured bandwidth of the current amplifier is 120 MHz, which leads the current amplifier can be adopted to compose the analog baseband of a wideband direct-conversion receiver with bandwidth of 240 MHz (twice of the baseband bandwidth). Measured current gain of the current amplifier is 15 dB. Measured output DC-offset without and with DC-offset cancellation are − 70.8 dBV and − 91 dBV, respectively. Thus, DC-offset reduction of 20 dB is achieved.
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This study was funded by Ministry of Science and Technology, Taiwan.
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Shih, HY., Chang, YC. & Yang, CW. A wideband current amplifier with DC-offset cancellation utilizing chopper modulation. Analog Integr Circ Sig Process 98, 291–297 (2019). https://doi.org/10.1007/s10470-018-1376-1
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DOI: https://doi.org/10.1007/s10470-018-1376-1