Miller compensation circuit and electronic circuit
A technology of Miller compensation and Miller capacitance, applied in the field of electronics, can solve the problems of the compensation instability of the Miller compensation circuit, and achieve the effect of improving the compensation stability and compensation effect.
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example 1
[0073] Such as image 3 As shown, this example provides a Miller compensation circuit including a differential amplifier 100 , an output transistor 102 , a feedback network 112 and a load 114 .
[0074] The inverting input terminal of the differential amplifier 100 is connected to the input signal VIN, the non-inverting input terminal F of the differential amplifier 100 is connected to the output of the feedback network 112, the output terminal of the differential amplifier 100 is connected to the input terminal B of the output transistor 102, and the output terminal of the output transistor 102 The second terminal E is connected to the output VOUT, the third terminal of the output transistor 102 is connected to the power supply 1, the input terminal of the feedback network 112 is connected to the output VOUT, and the load 114 is between the output VOUT and the power supply 2; it includes a non-inverting gain circuit 106, which is characterized by non-inverting The gain circui...
example 2
[0109] Such as Figure 6 As shown, this example provides a Miller compensation circuit. The output transistor is realized by the PMOS transistor 200; the follower is realized by the PMOS transistor 300; the PMOS transistor 400 constitutes an output current sampling circuit, and the drain current of the PMOS transistor 400 is the sampling current ISNS; the resistor 402 and the resistor 404 constitute a feedback circuit, The output node E is the input of the feedback circuit, and the node F is the output of the feedback circuit; the resistor 408 and the capacitor 406 form a load; the input and output terminals of the non-inverting gain circuit are shorted, so the small signal gain from input to output is A=1. At this point the second pole of the feedback loop is:
[0110]
[0111] The left half plane zero of the feedback loop is:
[0112]
[0113] by ω zero =α*ω p2 ,Available
[0114]
[0115] This formula has nothing to do with the current IO of the output transis...
example 3
[0117] Such as Figure 7 As shown, this example provides another Miller compensation circuit, the output transistor of which is realized by the PNP transistor 202; the follower is realized by the NPN transistor 306; the PNP transistor 500, the NPN transistor 502, and the NPN transistor 504 form an output current sampling circuit, The collector current of the NPN transistor 504 is the sampling current ISNS; the current source 506 and the PNP transistor 508 form a non-inverting gain circuit, and the small signal gain from input to output is A=1; the current source 510 and the capacitor 512 form a load; the feedback network The input and output terminals are shorted. At this point the second pole of the feedback loop is:
[0118]
[0119] The left half plane zero of the feedback loop is:
[0120]
[0121] by ω zero =α*ω p2 , we can get α=M.
[0122] This formula has nothing to do with the current IO of the output transistor, so when the current of the output transistor...
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