KEY POWER AMPLIFIER Russian patent published in 2010 - IPC H03F3/193 

FIELD: radio engineering.

SUBSTANCE: key power amplifier (KPA) comprises active key element (AKE), serially connected the first inductance L₁ and the second capacitor C₂, which form a serial generating L₁C₂ - circuit, parallel connected the first capacitor C₂, the second inductance L₂ and active load R, forming parallel L₂C₁R - circuit, and source of supply voltage V_ds with throttle (Th) and blocking capacitor C_bl for isolation of HF circuits by supply. Inlet of AKE is device inlet. AKE inlet is connected to the first inductance L₁, the second output of which, at one side, via the second capacitor C₂ is connected to output of KPA, and at the other side - via throttle Th is connected simultaneously to the first terminal of supply source V_ds and to the first output of blocking capacitor C_bl. The second terminal of supply source V_ds and the second output of blocking capacitor C_bl are connected both to common point of AKE, being simultaneously a common bus of KPA, and to common point of parallel L₂C₁R - circuit, other common point of which is output of KPA. Values of main elements satisfy the following ratios where Q_L - quality of loaded circuit, ω_s - angle frequency of input signal, V_ds - voltage of supply source, P - level of output signal capacity. Using values of main elements calculated in compliance with given formulas in amplifier fully realises mode of its operation in amplifier in class "E", when it is possible to produce efficiency factor, which is theoretically equal to 100%. Such optimal mode of class "E" in amplifier may be provided at higher frequencies compared to available devices.

EFFECT: increased maximum frequency of operation with maximum possible efficiency.

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