A balanced amplifier
An amplifier and balance technology, applied in low-frequency amplifiers, power amplifiers, push-pull amplifiers, etc., can solve the problems of unstable amplifiers and inability to obtain expected effects.
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[0024] FIG. 1 shows a schematic block diagram of a vacuum tube balanced amplifier of the first embodiment of the present invention, and FIG. 2 shows a detailed circuit diagram.
[0025] As shown in Figure 1, the first stage is a special type of difference amplifier consisting of amplifying devices 7 and 8, resistors 1, 2, 3 and 4, and a current source 11. The first stage receives a balanced input signal (+INPUT & -INPUT) and provides two pairs of feedback interfaces to feed back the output signal of the subsequent amplifier stage to the first stage.
[0026] The second stage is yet another type of special differential amplifier consisting of amplifying devices 9 and 10 , resistors 5 and 6 and a current source 12 . The second stage amplifies the balanced signal from the first stage and maintains the balanced signal for subsequent amplification or output power stages.
[0027] Further details are shown in Figure 2A. The balanced amplifier consists of four pairs of dual vacuum ...
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