A wideband inductorless dB-linear automatic gain control amplifier using a single-branch negative exponential generator for wireline applications. IEEE Transactions on Circuits and Systems I: Regular
Design of a wideband variable-gain amplifier with self-compensated transistor for accurate dB-linear characteristic in 65 nm CMOS technology. IEEE Transactions on Circuits and Systems I:
This paper reports two variable-gain amplifiers (VGAs) featuring a new pseudo-currentsteering gain-tuning technique. In the first VGA (VGA-I), a single-voltage-controlled dual-branch current mirror is developed as a standalone gain control block. In the second VGA (VGA-II), two NMOS transistors, which are biased by a tunable voltage, are integrated into a conventional common-source amplifier to steer away from a part of the total current. Meanwhile, the theoretical analysis is developed to reveal the mechanism of different gain tuning. Fabricated in a 40-nm CMOS process, VGA-I (VGA-II) occupies a tiny area of 0.03 mm 2 (0.024 mm 2) and consumes 22 mW (20 mW). Measured over a gain range of > 64 dB, the-3-dB bandwidth of VGA-I (VGA-II) is 9 GHz (6.6 GHz). For the time-domain tests, VGA-I (VGA-II) exhibits a jitter of 40 ps (30 ps), under a 2 7-1 PRBS input at 12 Gb/s. Their power efficiencies (1.83 and 1.67 pJ/bit) compare favorably with state-of-the-art. INDEX TERMS CMOS, high-speed transceiver, variable-gain amplifier (VGA), negative capacitance (NC), peak-to-peak jitter, data-dependent jitter (DDJ), pseudo-current steering, wide-tuning gain control, dual-branch current mirror, active inductor.
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