| 摘要 |
PURPOSE:To prevent the deterioration of the high frequency characteristic in the level shift circuit by providing a capacitor in parallel with a level shift diode. CONSTITUTION:The capacitor C1 is connected in parallel with the level shift diodes D1, D2, D3 and D4. In another example, three common source amplifier circuits 31, 32 and 33 and three level shift circuits 41, 42 and 43 are connected directly alternately. In connecting the level shift circuit with the amplifier circuit in multi-stage, number of the level shift circuits is large and the effect of the frequency characteristic of the level shift circuit onto the entire frequency characteristic is large, but the capacitor with a comparatively small capacitance is connected in parallel with the level shift diode, then the deterioration in the high frequency characteristic is prevented.
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