DEP0033570DA - Push-pull amplifier - Google Patents

Description

Push-pull amplifier

You invention beeieht calibration vornehalieh on amplifier with at least two push-pull operating electron tubes.

One aim of the invention is to reduce the phase shift that occurs in the output circuits of amplifiers of the push-pull type.

Another and more specific aim is to " facilitate the use of feedback in push-pull amplifiers in those cases" where the amount of feedback used is normally limited by the amount of phase shift that occurs in the output transformer.

One problem with which one has to regret when designing a common push-pull amplifier is that of phase shifting in the output transformer. When an output transformer is used in conjunction with an unconventional push-pull amplifier, a phase shift is usually introduced due to the positive scatter in the transformer and due to the distributed capacitance in the windings. Such phase shift is often Maderlloh _f especially when it is wüsscheaswert, ei the Singangskrels the amplifier anaulegen a Bückkopplung, the 1st derived from any point beyond the Primlirseite of the output transformer if a substantial Büokkopplungsbetrag is to be applied, so can © the off gange t rans fο rma tor may be designed in such a way that only small amounts of phase shift are introduced at sufficiently high frequencies. Bia such a transformer would, however, likely from a design standpoint

and the economy not be feasible. It is therefore advantageous in many applications to use an Ireis which, while maintaining the essential advantages of a normal push-pull battery, introduces only a minimal phase shift.

According to the present invention, an electron tube is a controlled in a conventional manner Gegentaktrerstärkere with their Swisclienau ?? gang3 k r4 ei β teetliodeag @ k "ppelt, a © dees both PriEärwlcklungen dee Ausgangekreiees are fed in phase" As a result of auftretenderi in kathodengeköppelten burrow negative feedback of its inputs spanmöjg this must be pre-marketed accordingly. If an output transformer is used with a gear ratio of one, the two primary windings are each capacitively coupled to the secondary winding according to a further development of the Krfiadimg, whereby the relevant low voltage currents are essentially connected in parallel. As a result, the windings retain essentially the same phase and amplitude, and the phase shift caused by flux scattering is actually kept. Pie tubes deliver a power to the individual primary windings that is one-sided or asymmetrical with respect to earth , in contrast to the symmetrical supply, which consists of a normal push-pull circuit. As a result, the voltage that occurs at any moment on the entire primary side of the output transformer of an amplifier according to the present invention is reduced to approximately half of that voltage that occurs in a normal push-pull circuit. This reduces the effect of the stray capacities of the windings and the phase shift introduced by the unique capacities.

Embodiments of the present invention are particularly applicable to modulation systems, if a common push-pull amplifier is used to deliver an audio frequency signal to a modulation system, the negative feedback due to the phase shift is in push-pull

output transformer is often limited to the Hörkrela alone. The counter-coupling is then usually only derived from the primary side of a counter-signal output transformer? -si © therefore has no corrective influence on the distortion and the background noise in the carrier or high-frequency stages, Geaäes a 'Veitorbildung the present invention can the negative feedback without special: ohwi Ob rigkeit just as well from the® high-frequency stages as from the Hdrfrequencyatufen of the modulation eystsiaa are removed _r because & In the output skr & ia of the Ktirfrequariiers there is practically no harmful phase shift.

The above and other features of the invention will be more fully understood from the following "Detailed Information." Description in connection with old drawing. In the drawing shows:

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Claims (1)

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