Fast-Settling Feedforward Automatic Gain Control Based on a New Gain Control Approach

Cheng, Xin; Xie, Guangjun; Zhang, Zhang; Yang, Yana

doi:10.1109/tcsii.2014.2331097

Cited by 12 publications

(3 citation statements)

References 15 publications

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“…The operation thresholds discussed above are determined by a reference voltage V REF , which regulates the amplitude of the output signal. There are two ways to implement an AGC: by feeding the output signal to an internal block (feedback) [21,22] or by feeding the input signal to more than one internal block (feed-forward) [23]. This work will analyze the analog version of the first option, which is shown in Figure 3.…”

Section: Automatic Gain Control (Agc)mentioning

confidence: 99%

CMOS Analog AGC for Biomedical Applications

et al. 2020

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In this paper, we present the design of an analog Automatic Gain Control with a small silicon area and reduced power consumption using a 0.5 μ m process. The design uses a classical approach implementing the AGC system with simple blocks, such as: peak detector, difference amplifier, four-quadrant multiplier, and inversor amplifier. Those blocks were realized by using a modified Miller type OPAMP, which allows indirect compensation, while the peak detector uses a MOS diode. The AGC design is simulated using the Tanner-Eda environment and Berkeley models BSIM49 of the On-Semiconductor C5 process, and it was fabricated through the MOSIS prototyping service. The AGC system has an operation frequency of around 1 kHz, covering the range of biomedical applications, power consumption of 200 μ W, and the design occupies a silicon area of approximately 508.8 μ m × 317.7 μ m. According to the characteristics obtained at the experimental level (attack and release time), this AGC can be applied to hearing aid systems.

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Section: Automatic Gain Control (Agc)mentioning

confidence: 99%

CMOS Analog AGC for Biomedical Applications

et al. 2020

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“…Each category has its own advantages and disadvantages. The gain of the VGA can be converged in one step [8], [9]. The one step scheme shortens the settling time of the AGC.…”

Section: Introductionmentioning

confidence: 99%

Analysis and Mitigation of ICI Due to Gain Adjustment in OFDM Systems

2019

IEEE Access

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Automatic gain control (AGC) is widely adopted in orthogonal frequency division multiplexing (OFDM) systems to compensate the significant variation of the received signal. In OFDM systems, the duration of the cyclic prefix (CP) is usually equal to the delay spread of the channel to minimize the system overhead. The inter-symbol interference (ISI) between consecutive OFDM symbols spreads over a large portion of the CP. The CP contaminated by the ISI should not be used to estimate the received power. If the duration of the remaining CP is shorter than the settling time of the AGC, then the gain adjustment will be carried out within the useful portion of the OFDM symbol. The subcarrier orthogonality is lost and the system performance is degraded by the resulting inter-carrier interference (ICI). In this paper, we propose a simple and efficient scheme to mitigate the ICI. The proposed scheme can be easily implemented in actual systems because of its low computational complexity. The simulation results show that the proposed scheme can increase the signal-to-interference-plus-noise ratio significantly compared to the traditional scheme.INDEX TERMS Automatic gain control, inter-carrier interference, inter-symbol interference, orthogonal frequency division multiplexing.

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“…It is optimised for fast processing architectures. In [11], a feed‐forward AGC circuit composed of a digital coarse gain setting and an analogue fine gain setting is put forward. It is able to get the fine gain setting by a one‐step adjustment to short the settling time.…”

Section: Introductionmentioning

confidence: 99%