JPS62188810U

JPS62188810U -

Info

Publication number: JPS62188810U
Application number: JP7536986U
Authority: JP
Priority date: 1986-05-21
Filing date: 1986-05-21
Publication date: 1987-12-01

Description

[Brief explanation of the drawing]

第１図は本考案の一実施例に係る電圧制御形発
振回路の構成図、第２図は本考案に適用される差
動回路の他の実施例を示す回路図、第３図、第４
図は本考案の他の実施例の回路図、第５図は従来
回路の構成図である。１，２，３，３４，４０，４１，４３……トラ
ンジスタ、８……制御電圧源、９，３０，３１…
…コンデンサ、１０……インダクタ、１１，１２
……帰還路、１４，１５……抵抗。 FIG. 1 is a block diagram of a voltage controlled oscillator circuit according to an embodiment of the present invention, FIG. 2 is a circuit diagram showing another embodiment of a differential circuit applied to the present invention, and FIGS.
The figure is a circuit diagram of another embodiment of the present invention, and FIG. 5 is a configuration diagram of a conventional circuit. 1, 2, 3, 34, 40, 41, 43...transistor, 8...control voltage source, 9, 30, 31...
...Capacitor, 10...Inductor, 11, 12
...Return route, 14,15...Resistance.

Claims

[Claims for Utility Model Registration] (1) First and second transistors forming a differential pair whose emitters are commonly connected, and a resonant circuit connected between the collectors of the first and second transistors; a feedback path connecting one collector of each of the first and second transistors to the base of the other; a third transistor having a collector connected to the emitter; and a common connection between the third transistor and the emitter. a fourth transistor forming a differential pair;
base current dividing supply means for dividing and guiding the collector current of the fourth transistor to the bases of the first and second transistors; collector-base capacitance variable means for changing the collector-base voltage of the transistor;
A voltage-controlled oscillation circuit characterized in that the collector currents of the third and fourth transistors are varied by voltage control to control the oscillation frequency. (2) The base current dividing supply means is characterized in that the fourth transistor is of a double collector type, and each collector is connected to the bases of the first and second transistors. Voltage-controlled oscillator circuit described in . (3) In the base current dividing supply means, each collector is connected to the bases of the first and second transistors, a constant DC voltage is applied to both bases, and the emitters are commonly connected to the bases of the fourth transistor. The voltage controlled oscillator circuit according to claim 1, characterized in that it comprises fifth and sixth transistors connected to the collector. (4) The voltage controlled oscillator circuit according to claim 1, wherein the collector-base capacitance variable means is formed by inserting a resistor or a diode in the feedback path. (5) The collector-base capacitance variable means is the first
, the first and second series resistors are connected between the collectors of the second transistor, the base is connected to the connection midpoint of the series resistors, and the emitter is connected to the collector of the fourth transistor via the resistor. The voltage controlled oscillator circuit according to claim 1, characterized in that it comprises a seventh transistor and a capacitor inserted in the feedback path.