| 摘要 |
A high radio frequency amplification system applicable to radio receiving in which a low input voltage having a particular frequency fed from an input tuning circuit is amplified in amplifier to provide an output signal voltage having the same frequency as that of the said input signal voltage, a portion of said output signal voltage is fed back to said amplifier, another portion of the rest of said output signal voltage is fed back to said amplifier after doubling the frequency of the second portion of signal voltage whereby said low input voltage having the particular frequency, said fedback voltage having the same frequency as that of the input voltage and constituting a portion of said output voltage and a voltage constituting another portion of the rest of said output voltage and having a frequency two times as high as that of the first-mentioned two types of voltage are mixed together in said mixing amplifier so as to obtain a high output voltage having the same frequency as that of said input voltage.
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