SU1305827A1 - Two-step power amplifier - Google Patents

Abstract

Invention m, b. used in the output stages u-lay audio frequency. The purpose of the invention is to reduce nonlinear distortion. U-l contains in each arm transistors 1 and 2, power sources 3 and 4, diodes 5 and 6, resistor 7 and bias source 8. In each arm u-l, the input signal is quantized to three levels amplified by different groups of e-cells one total load, on a swarm, all three levels are added to one common signal. The transistors 2 are used with an initial current, which significantly reduces the switching delay of the transistors. As a result, non-linear distortion is reduced. 1 Il. S (L with about JV oo GcheE

Description

The invention relates to radio engineering and can be used in the output stages of audio amplifiers ,.

The purpose of the invention is to reduce nonlinear distortion.

The drawing shows the principal electrical circuit of the proposed push-pull power amplifier.

The power amplifier contains in each order in reverse order. Thus, the first and second transistors 1 and 2, the first and second power supply sources 3 and 4, the first and second diodes 5 and 6, the resistor 7 and the bias source 8 are so obdom shoulder.

The amplifier works as follows.

In the absence of an input signal, the first transistors 1 of the shoulders of the push-pull power amplifier are closed, with a single-phase current, which was significantly reduced by the second transistors 2 and the resistors, retarding 1.switch the switching of the transistors. As a result, the non-linear distortions in the proposed

Claims (1)

push-pull power amplifier. Invention Formula Two-stroke1) 1st power amplifier, containing in each arm the first and 7, the initial current is flowing, laziness; 1Y bias sources 8. Since the initial currents of the second transistors 2 are equal in magnitude and opposite in direction, the voltage at the output of the push-pull power amplifier is zero. The second diodes 6 are closed by the voltage of the first power sources 3. Under the influence of the input 30 second transistors of one structure and a signal of positive polarity, the first and second power sources, the collector of the first transistor is connected via the first diode to the corresponding bus of the first power source, J5 its base is the input of a push-pull power amplifier, and the emitter output, the collector of the second transistor is connected to the corresponding bus of the second power source, its base one of the second transistors 2 opens, as a result of which the current flowing through the corresponding second power source 4 increases and the output signal appears at the output of the push-pull power amplifier. After the input signal reaches the opening level of the first transistor 1, a current begins to flow through the source: the bias is connected to the corresponding first source 3 by the base of the first transistor, while the power through the first transistor 1, the first diode 5 and the load. At this time, the second transistor 2 of this arm operates in the current generator mode, since any changes in the voltage across the load through the resistor 7 are transmitted to the emitter of this transistor and exclude the possibility of its opening. the transistor of one shoulder and the other of the connector have an opposite structure, characterized in that 45 in order to reduce distortion, a second diode is connected in each shoulder between the emitter of the second transistor and the collector of the first transistor, and between the emitters of the first and second When the input signal level-Q transistors - a resistor. Compiled by V, Serov Editor Oh, Yurkovetskaya Tehred M. KhodanychKorrektor L. Pilipenko Order 1464/54 Circulation 902 VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., d, 4/5 Production and printing company, Uzhgorod, st. Project, 4 On the first power supply 3, the first diode 5 is closed and the current flowing through it is stopped. At the same time, the second diode 6 opens, and the current from the second power source 4 passes to the output of the push-pull power amplifier through the first and second transistors 1 and 2. When the input signal level decreases, the process of penetrating the cathode arm of the push-pull power amplifier is quantized by three a level amplified by different groups of elements with one common load, at which all three levels are combined into one common signal. In the proposed push-pull power amplifier, the second transistors 2 are used with a two-stroke power amplifier. Invention Formula Two-stroke1) 1st power amplifier, containing in each arm the first and the second transistors of one structure and the first and second power sources, 40 through the source of the bias is connected to the base of the first transistor, while the transistor of one shoulder and the other of the connector have an opposite structure, characterized in that 45 in order to reduce distortion, a second diode is connected in each shoulder between the emitter of the second transistor and the collector of the first transistor, and Subscription