On the design of constant settling time AGC circuits

Khoury, J.M.

doi:10.1109/82.664234

Cited by 156 publications

(85 citation statements)

References 11 publications

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“… Automatic gain control loops are used in many systems to stabilize the signal level before analog-to-digital conversion [1][2][3]. A typical AGC loop is shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear Modelling of Automatic Gain Control Loops Considering Loop Dynamics and Stability

El-Shennawy¹,

Joram²,

Ellinger³

2017

JEE

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This work presents modelling aspects of automatic gain control (AGC) loops based on linear-in-dB variable gain amplifiers (VGAs). In these loops, the VGA control voltage is also an excellent received signal strength indicator (RSSI). The VGA gain is however nonlinearly related to the control voltage. Moreover, VGAs and detectors undergo nonlinear compression under high input amplitudes during settling transients. The main contribution in this work is a proposed nonlinear model based on simple and readily available components from the "analogLib" and "functional" libraries in CADENCE design environment -making it very easy and fast to build and simulate-that captures the nonlinear effects of AGC loops. The model is capable of verifying the AGC loop stability and capturing the loop dynamics with high accuracy compared to time consuming circuit level simulations. This provides insights into system level parameters such as AGC loop bandwidth, phase margin, settling time as well as estimating the AGC range and RSSI voltage vs. input power. Measurement results from a fabricated AGC prototype are in good agreement with simulation and modelling results thus validating the proposed modelling approach.

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“… Automatic gain control loops are used in many systems to stabilize the signal level before analog-to-digital conversion [1][2][3]. A typical AGC loop is shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear Modelling of Automatic Gain Control Loops Considering Loop Dynamics and Stability

El-Shennawy¹,

Joram²,

Ellinger³

2017

JEE

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“…5 shows the current-mode integrator, developed from the current-mode differential integrator [10]. When the current source 6 I , which is equal to 7 I , equals to 2I and 8 I is set to i K I . Consequently, the output current ( B I ) can be shown as…”

Section: Current-mode Integratormentioning

confidence: 99%

“…The current amplifier using in the AGC system must be exponentially controlled to maintain AGC loop settling time which is independent of signal levels of input current [6]. Fig.…”

Section: Current-mode Exponential Control Current Amplifiermentioning

confidence: 99%

A low-voltage, low-power current-mode automatic gain control (AGC) for battery-powered equipment

Siripruchyanun

2006

Third IEEE International Workshop on Electronic Design, Test and Applications (DELTA'06)

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“…(1)(2)(3)(4)(5)(6)(7)(8) have assumed that the input transistors operate in triode region and the other transistors operate in saturation region. In the real circuit design, however, as the control voltage increases, the input transistors will gradually enter saturation region and, eventually, the gain no longer depends on V DS .…”

Section: Inherently Db-linear Vga Cellmentioning

confidence: 99%

“…VGAs adjust their gain as the input signal strength changes, and the gain change must settle within a certain time period regardless of the amount of input signal change [2]. In order to realize such a constant settling time of the gain, most VGAs embed a dB-linear gain control capability [2].…”

Section: Introductionmentioning

confidence: 99%