Differential AGC with offset stability and wide range frequency synthesis

Daher, Ali; Osman, Ziad; Haidar, Ahmed M. A.

doi:10.1007/s10470-018-1341-z

Cited by 1 publication

(4 citation statements)

References 12 publications

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“…AGC is a closed loop system that maintains the output level constant while the input level may change considerably 6 . The input–output characteristics of an ideal AGC are shown in Figure 1 7 .…”

Section: Theorymentioning

confidence: 99%

“…For larger input signal, when

V_{i}

exceeds

V_{2}

, the output is again a linear function of the input signal level. To avoid instability problems, the AGC operation at very high gain level is often eliminated 6 …”

Section: Theorymentioning

confidence: 99%

“…5 2 | THEORY AGC is a closed loop system that maintains the output level constant while the input level may change considerably. 6 The input-output characteristics of an ideal AGC are shown in Figure 1. 7 For a small input signal, the AGC loop does not operate, and the output signal changes linearly with respect to the input signal.…”

Section: Introductionmentioning

confidence: 99%

“…To avoid instability problems, the AGC operation at very high gain level is often eliminated. 6 As shown in Figure 2, simple AGC loop consists of three components: a VGA, a peak detector, and a comparator. The gain of the VGA is a function of a control voltage.…”

Section: Introductionmentioning

confidence: 99%

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Design of an automatic gain control loop for high speed communication

Chowdhury

Hasan

2022

Circuit Theory & Apps

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This paper presents the design of an automatic gain control (AGC) loop for high-speed communication systems, which can be used in wired, wireless, or optical receiver. The design is performed in 130 nm SiGe BiCMOS technology. A Gilbert cell-based variable gain amplifier is designed, which shows approximately linear gain control with respect to the gain control voltage. The variable gain amplifier is followed by two fixed gain cascode amplifiers. Then, a full wave rectifier-based peak detector is designed and analyzed. To reduce the peak detector error, a compensation technique is applied. Finally, an operational amplifier is designed, which is used as voltage adder and comparator.The designed AGC loop is simulated with sinusoidal and pseudorandom binary sequence (prbs) input signal with high frequency signal of 1 to 30 GHz.The simulation results of the AGC loop show that a gain tuning range of 47 dB (À7 to 40 dB) is obtained in this design. It is also seen that the reference signal can be varied from 50 to 200 mV. This AGC works in the input voltage signal range between 3 mV peak and 230 mV peak, and the power dissipation of is 79 mW. K E Y W O R D Sautomatic gain control, fixed gain amplifier, high efficiency power amplifier, peak detector, variable gain amplifier

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Section: Theorymentioning

confidence: 99%

“…For larger input signal, when

V_{i}

exceeds

V_{2}

, the output is again a linear function of the input signal level. To avoid instability problems, the AGC operation at very high gain level is often eliminated 6 …”

Section: Theorymentioning

confidence: 99%