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High efficiency power amplifier comprising multilevel power supply
| Details |
Inventors: Gulczynski, Zdzislaw;
Assignee:
Primary Examiner: Wan; Gene
Assistant Examiner:
Attorney, Agent or Firm:
The analog power amplifier (PA) is particularly for a closed loop signal amplification requiring high output power, high efficiency, high speed, wide operating temperature range and a low number of components. The high efficiency is obtained thru an employment of multiple PAs and a nonlinear amplifier which completely eliminates controllable power switches. No thermal compensation and no matching of the output transistors, and no adjustments are necessary. A nonlinear amplifier amplifies an input signal and provides a plurality of interim signals each having a different transfer function with respect to the input signal. PAs separately amplify each of the interim signals and provide at least a portion of an output signal of the entire PA. The nonlinear amplifier includes a plurality of diode circuits for determining the transfer functions of the interim signals so that the output current take-over by the individual PAs is smooth. |
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DETAILED DESCRIPTION OF THE INVENTION FIG.
1 is the embodiment of the high efficiency PA as disclosed in the aforementioned U.
S.
Pat.
No.
4,782,306 by the same inventor.
The PA comprises 4-level power supply, whereas the two supply voltages of the PA 35 are not shown for simplicity.
The circuit contains a nonlinear amplifier and a pair of PAs, one of which is greatly simplified as it consists of just two transistors, whereby each transistor can be considered as a separate PA.
The nonlinear amplifier amplifies the input signal of the PA and provides a plurality of interim signals, further separately amplified by the PAs.
The outputs thereof are coupled together for combining the amplified interim signals into a single output signal of the PA.
The input signal of the PA is applied to the nonlinear amplifier which comprises the resistors 30, 31 and 34, and the transistors 32 (npn) and 33 (pnp).
The emitters thereof are connected to ground.
The bases thereof are tied to the resistor 30, and the collectors thereof are coupled to the supply voltage sources V6 and V7 via the resistors 31 and 34 respectively, and provide a pair of outputs of the nonlinear amplifier.
The input and a third output thereof are the separate ends of the resistor 30.
The collectors of the transistors 32 and 33 are connected to the bases of the transistors 36 (pnp) and 37 (npn) respectively.
The emitters of the transistors 36 and 37 are coupled to the respective supply voltage sources V6 and V7 which extend the output voltage range of the entire circuit.
The nonlinear amplifier includes therefore a plurality of diode means for determining the transfer functions of the interim signals.
In particular, the transistors 32 and 33 act as diodes for limiting one interim signal, and as separate nonlinear amplifiers with a diode input characteristic and a corresponding transfer function for the two other interim signals.
Thereby, the diode means provide separate interim signals below, within and above a predetermined range according to the voltage level of the input signal
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