| 摘要 |
<p>PURPOSE: To eliminate the load fluctuation of a local oscillation circuit at the rise point of transmission or reception control signals and to eliminate oscillation frequency fluctuation by making a base current in an HFA and a frequency converter circuit flow at all times. CONSTITUTION: Regardless of the transmission control signals of a low level or a high level from a terminal 115, the base current is allowed to flow to a transistor 105 for high frequency power amplification at all times by resistors 103 and 104 for base bias. Thus, regardless of the conduction or nonconduction of a collector current, the input impedance of the transistor 105 is approximately fixed. Thus, the load fluctuation to the local oscillation circuit is eliminated and an oscillation frequency dose not fluctuate at the rise point of the transmission control signals. Further, this fact it is the same for a reception frequency converter circuit and a reception control circuit as well.</p> |
