Power amplifying device and linear adjuster

Abstract

The invention discloses a power amplifying device and a linear adjuster. The power amplifying device comprises a first transistor, a second transistor and a driving circuit of the second transistor, wherein the first transistor and the second transistor are connected in series; the driving circuit of the second transistor comprises a third transistor, a compensating network and a voltage source; the first end of the third transistor is connected with a driving signal end and the first transistor respectively; the second end of the third transistor is connected with a connecting end between the first transistor and the second transistor; the third end of the third transistor is connected with the second transistor and the compensating network respectively; the compensating network is also connected with the voltage source. By the adoption of a push- pull structure composed of double N-shaped transistors provided by the invention, without transformer coupling and independent control on the upper and lower transistors, the characteristics of simple structure, simple control, high efficiency and the like can be realized, and the defect that an existing linear adjuster is inapplicable for a great-bandwidth and large-power application site or more problematic can be overcome.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to a power amplification device and a linear regulator. Background technique [0002] In electronic devices, there are many occasions where it is necessary to linearly amplify the signal to drive subsequent actuators, or as a power supply to supply power to subsequent devices. However, in some applications where the dynamic change of the load is very fast, or the bandwidth of the amplified signal is very high, the bandwidth of the linear power amplifying device is required to be very high. In particular, in the communication system, in order to achieve faster data transmission in the limited frequency spectrum, the amplitude of the modulated radio frequency signal varies greatly dynamically, which brings about a prominent problem that the efficiency of the radio frequency power amplifier is low, which becomes a key factor in improving the overall The bottleneck of communication...

AI Technical Summary

Problems solved by technology

The problem with this prior art is that the bandwidths of the two independent controllers 303 and 304 must be different in practical applications, otherwise conflicts are likely to cause oscillations, and when the bandwidth of one controller is low, the effect of push-pull will become worse. Efficiency is thus reduced and the bandwidth of the linear regulator is limited

[0007] In summary, the existing linear regulator technology is either not suitable for high-bandwidth and high-power applications, or there are many practical problems

Images