| 摘要 |
PURPOSE:To obtain a high frequency, high band amplifier free from decrease of gain in low band by connecting a series circuit of a loop feedback resistance and a capacitor between the collector of a base grounding circuit and the base of an emitter grounding circuit and making the product of the value of capacity of the capacitor and working frequency width less than a specified value. CONSTITUTION:The collector terminal 22 of a base grounding Tr20 and the base terminal 11 of an emitter grounding Tr10 are connected in series by a loop feedback resistance 40 and a capacitor 50 for low band gain control. In this case, the capacity value of the capacitor 50 is so determined that inverse number of product of working frequency width of an amplifier and value of capacity of the capacitor 50 has a value greater than 20. By selecting above- mentioned value properly within a forementioned range, the quantity in low band can be adjusted. Accordingly, increase of loss in low band due to reduction of number of winding of a load transformer 60 for widening band of the amplifier can be compensated by adjusting the value of capacity of the capacitor 50.
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