By Juan Pablo Alegre Pérez
This e-book analyzes computerized achieve keep an eye on (AGC) loop circuits. the most goal of this publication is to illustrate AGC ideas within the surroundings of instant receivers, commonly in instant receivers with stringent constraints in settling-time and large dynamic variety, akin to WLAN and Bluetooth receivers. on account that feedforward AGCs current nice merits during this context, instead to traditional suggestions AGCs, this publication features a distinct examine of feedforward AGCs layout –at the extent of uncomplicated AGC cells, in addition to the method point, together with their major features and performance.
- Provides an entire evaluate of automated achieve keep watch over loops, protecting either suggestions and feedforward methods;
- Describes the whole layout stream of the most blocks utilized in AGC circuits (PGAs/VGAs, top detectors and regulate voltage new release circuits), contemplating low-voltage low-power restrictions;
- Includes genuine AGC architectures carried out as a basic goal electronic feedforward CMOS AGC, a completely analogue feedforward AGC and a mixed feedforward/feedback CMOS AGC
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Additional info for Automatic Gain Control: Techniques and Architectures for RF Receivers
26 2â•… AGC Fundamentals Fig. 02 0 Fig. 14, no filter is needed in this AGC as stability will not suffer the lack of this block. 15. 3â•…Conclusions In this chapter, the two main AGC configurations have been introduced: feedback and feedforward loops. An analysis has been made which, though not exhaustive, it highlights each of the main topology properties. Furthermore, Simulink-Matlab toolbox has been employed to verify these results by behavioural simulation. Output Amplitude (V) Fig. 05 0 0 t (us) Each architecture offers different advantages and drawbacks, which must be taken into account when choosing one for a target application.
Active VGAsâ•‡ For high frequency applications, open loop amplifiers are commonly used that employ variable transconductance to achieve gain variation or active 32 3â•… Basic AGC Cells Fig. 2â†œæ¸€ Differential pair transconductor with degenerative resistor 5/ YRXW 5/ YLQ YLQ Ā 5GHJHQ VGAs. This transconductance variation is usually achieved by changing the bias current, or by means of an adjustable source degeneration resistor. 1 Degeneration Based VGA Structures. 2 , is a very popular standard topology for a differential variable-gain amplifier since it offers a good trade-off between linearity, gain range and power consumption.
9Â€V by current source Irefâ•›. 6Â€GHz) and lower power consumption is required. Furthermore, it moderates the variations of the common-mode current sensed by transistors M5 due to gain variation. 4Â€Vp-p 50Â€MHz differential output signal. The feedback loop includes a capacitor, CC, to guarantee circuit stability. 35Â€μm CMOS level 49 device parameters. 2. 9b. In simulation, the load capacitors, CL, are 50Â€fF (simulating the input capacitance of the next stage) while the load resistors, RL, are 5Â€kΩ.