The name of the SRPP circuit is named by the Japanese, which is the abbreviation of Shunt Regulated Push Pull, which means a shunt-regulated push-pull amplifier; and some people in the United States call it the μ-Follower circuit, which is regarded as a special Structured follower amplifier circuit.
According to the current research on the SRPP circuit, its working structure can be understood as a follow-up structure composed of an active load (T2) and an amplifier part (T1), which pushes and pulls each other through self-regulation of the operating point and shunt to the load Amplifiers that complete the action together.
In order to discuss its working principle, a tube amplifier is taken as an example here (if not otherwise specified, all electronic active devices in this article refer to tubes). As far as the static working condition of the circuit is concerned, T1 and T2 are connected in series. If their operating characteristics are consistent with the taken parameters and have the same operating point, then there is screen current Ip1 = Ip2 and voltage between screen cathodes Upk1 = Upk2
= UB / 2, which is point-symmetric. When the AC signal is added to the circuit (see Figure 1), the input signal is set to the positive half cycle, then the gate bias voltage -Ug1 of the T1 tube increases, the screen current Ip1 increases, the voltage between the screen cathodes Upk1 decreases, and T2 The divided voltage on the cathode resistance Rk2 of the tube increases, making -Ug2 decrease (here we can see that the polarities of T1 electromotive force and T2 electromotive force are opposite to each other),
Ip2 decreases, Upk2 increases, so the current IRL that flows back from zero potential through the load RL is formed; on the contrary, when the input signal is negative half cycle, -Ug1, Ip1 of T1 tube decreases, Upk1 increases, and Tk tube Rk2 The voltage decreases, -Ug2 and Ip2 increase, and Upk2 decreases,
Then the current IRL is shunted to the zero potential through RL to complete a set of push-pull actions; in particular, if RL = ∞, the impedance of the circuit load is only the dynamic resistance of the active load of the T1 tube, and the entire circuit is in constant current operation. The current flowing through the load RL IRL = 0, only the voltage amplification effect. This is the so-called "shunt adjustment push-pull" theory.
According to the current research on the SRPP circuit, its working structure can be understood as a follow-up structure composed of an active load (T2) and an amplifier part (T1), which pushes and pulls each other through self-regulation of the operating point and shunt to the load Amplifiers that complete the action together.
In order to discuss its working principle, a tube amplifier is taken as an example here (if not otherwise specified, all electronic active devices in this article refer to tubes). As far as the static working condition of the circuit is concerned, T1 and T2 are connected in series. If their operating characteristics are consistent with the taken parameters and have the same operating point, then there is screen current Ip1 = Ip2 and voltage between screen cathodes Upk1 = Upk2
= UB / 2, which is point-symmetric. When the AC signal is added to the circuit (see Figure 1), the input signal is set to the positive half cycle, then the gate bias voltage -Ug1 of the T1 tube increases, the screen current Ip1 increases, the voltage between the screen cathodes Upk1 decreases, and T2 The divided voltage on the cathode resistance Rk2 of the tube increases, making -Ug2 decrease (here we can see that the polarities of T1 electromotive force and T2 electromotive force are opposite to each other),
Ip2 decreases, Upk2 increases, so the current IRL that flows back from zero potential through the load RL is formed; on the contrary, when the input signal is negative half cycle, -Ug1, Ip1 of T1 tube decreases, Upk1 increases, and Tk tube Rk2 The voltage decreases, -Ug2 and Ip2 increase, and Upk2 decreases,
Then the current IRL is shunted to the zero potential through RL to complete a set of push-pull actions; in particular, if RL = ∞, the impedance of the circuit load is only the dynamic resistance of the active load of the T1 tube, and the entire circuit is in constant current operation. The current flowing through the load RL IRL = 0, only the voltage amplification effect. This is the so-called "shunt adjustment push-pull" theory.
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