| 摘要 |
PURPOSE:To decrease the leakage of a local oscillation output from an output terminal by adding a variable resistor to a ring circuit to adjust the circuit balance. CONSTITUTION:If there is a difference in the impedance in the mixing circuit because of variation of impedances of an impedance converting transformer 1a and mixer diodes 2, 3, 4, 5, the leakage of the output of a local oscillator 6 is produced in the IF output by the difference. Then a mixer diode operating point adjusting variable resistor 10 is provided and the upper/lower impedance is corrected so as to attain an ideal circuit balance by the said adjustment. Then the leakage of local oscillation is attenuated and the conversion loss at the mixing circuit is decreased.
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