Non-inverting linear amplifier. Scheme, description

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Non-inverting linear amplifier. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Transistor power amplifiers

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A non-inverting linear amplifier is obtained when the microcircuit is turned on, as shown in Fig. 1 (numbers of outputs of the second channel similar in purpose are indicated in brackets). The maximum input voltage of the device is approximately 0,3 V. The DC gain is K=1+R3/R1.

Non-inverting linear amplifier

The maximum resistance of the resistor R1 is determined when the base current Ib of the transistor V2 (0,5 μA) of the differential stage of the microcircuit is turned on in this way: the current flowing through the resistor must be at least. 10 times the base current. Given that the voltage at the base of transistor V2 should be the same as at the base of transistor V4 of this stage (and there it is 1.3 V), the maximum resistance of resistor R1 is calculated using the formula R1 = 1,3 / 10Ib, which implies that it should be no more than 260 kOhm.

The resistance of the resistor R3, depending on the supply voltage, is determined from the ratio R3=(Upit/2,6-1)R1. Since the smallest IC supply voltage is 9V, the minimum DC gain is approximately 3,5. Its maximum value (at a supply voltage of 30 V) is about 12.

The gain of a non-inverting AC amplifier is Ku=1+R3/R2. With a supply voltage of 25 V, in the frequency range of 20 ... 20 Hz, it can be made any within 000 ... 10.

The capacitance of capacitor C4 (it is connected in parallel to the correction capacitor of the microcircuit) depends on the required gain and operating frequency band and for the unity gain mode is 39 ... 47 pF. Capacitor C1, which decouples the microcircuit from previous DC circuits, can have a capacitance of 0,2 μF or more, capacitor C2, which eliminates parasitic coupling in the power circuit, can be 0,1 ... 0,2 μF.

If necessary, the noise of the non-inverting amplifying stage can be reduced (by about 1,4 times) using not both, but only one of the transistors of the differential stage. In this case, pin 2(13) of the microcircuit is connected to a common wire, and the divider RIC3R2R3 is connected to pin 3(12). (1 μA): R5 \u4d 100 / 1Ie (0,65 - voltage - in volts - at the emitters of transistors V5, V0,65). With the specified ratio of currents, the resistance of this resistor should be no more than 2 kOhm. As for the resistor R4, its resistance when using one transistor at the input is calculated by the formula R1,3=(Upit/3-3)R1,3.

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