local oscillation circuit

Abstract

Abstract PURPOSE:To increase the overlapping of the frequency at switching by using a varactor diode in place of a switching diode so as to expand the frequency variable range and attaining the switching through the use of the varactor diode used in the forward direction. CONSTITUTION:A resonator block C is connected with an amplifier block D by a coupling capacitor C1, and a tuning voltage BT is applied to a connecting point between the capacitor C1 and the varactor diode D1 through a high resistance resistor R1. One end of a resonance line L1 is connected to an anode of the diode D1, the other end of the line L1 is grounded through a high resistance value resistor R2 and connected to the anode of the varactor diode D2' through a coupling capacitor C2. A changeover switch S1 is connected to the connecting point between the capacitor C2 and the diode D2', and a bias potential Bs through a high resistance resistor R9 and a ground potential through a high resistance resistor R10 are given switchingly to the connecting point by the switch S1. A changeover switch S2 is connected to the connecting point between the diode D2 and a capacitor C8, and a ground potential and a voltage BT through a high resistance resistor R7 are given switchingly to the connecting point by the switch S2.

Inventors

• 👤 Yoshio Fukutome
• 👤 福留　義夫
• 👤 Akira Usui
• 👤 晶 臼井
• 👤 Kazuhiko Kubo
• 👤 一彦 久保
• 👤 Hiroyuki Nagai
• 👤 裕之 永井

Bibliographic Details