JPH0369929U

JPH0369929U -

Info

Publication number: JPH0369929U
Application number: JP12872389U
Authority: JP
Priority date: 1989-11-02
Filing date: 1989-11-02
Publication date: 1991-07-12

Description

[Brief explanation of drawings]

第１図は本考案を実施した発振回路を示す回路
図であり、第２図は同じく他の実施例の回路図で
ある。第３図は従来例の回路図であり、第４図は
その等価回路図である。３……Ｕ／Ｖ切換え回路、５……発振回路、６
……帰還回路、９……タンク回路、１２……線路
、Ｑ_１，Ｑ_２……第１、第２トランジスタ、Ｌ_１，Ｌ_２，Ｌ_３……第１、第２、第３インダクタン
スコイル、Ｄ_２，Ｄ_３……スイツチングダイオー
ド、Ｑ_３……スイツチングトランジスタ、Ｃ_５，
Ｃ_６……高周波接地コデンサ、Ｉ_１……定電流源
。 FIG. 1 is a circuit diagram showing an oscillation circuit embodying the present invention, and FIG. 2 is a circuit diagram of another embodiment. FIG. 3 is a circuit diagram of a conventional example, and FIG. 4 is an equivalent circuit diagram thereof. 3...U/V switching circuit, 5...Oscillation circuit, 6
... Feedback circuit, 9 ... Tank circuit, 12 ... Line, Q ₁ , Q ₂ ... First and second transistors, L ₁ , _L2 , _L3 ...first, second, and third inductance coils, D2 _, _D3 ...switching diode, _Q3 ...switching transistor, _C5 ,
_C6 ...high frequency grounding capacitor, _I1 ...constant current source.

Claims

[Scope of Claim for Utility Model Registration] (1) In an oscillation circuit in which a tank circuit is connected to the collector of a transistor via a DC cutting capacitor, and the inductance coil of the tank circuit is switched by a switching diode to perform band switching. . An oscillation circuit comprising means for guiding a return current when the switching diode is turned on to the collector of the transistor as a power supply current. (2) first and second transistors connected in a differential pair; a feedback circuit connected between the collector of the second transistor and the base of the first transistor; and the collector of the first transistor and the base of the second transistor. In the oscillation circuit, the oscillation circuit includes a capacitor circuit that is grounded at a high frequency, a tank circuit that is connected between the collectors of the first and second transistors, and a switching diode that switches an inductance coil of the tank circuit. The return current of the switching diode is
An oscillation circuit comprising means for guiding a power supply current to at least one collector of the second transistor. (3) connecting the other end of a switching element whose one end is connected to a power supply terminal to the collector of the transistor to which the return current is not applied, so that the return current is applied to the control terminal of the switching element; and the output generated at the other end of the switching element is turned on at the same time as the first and second transistors.
, the power supply circuit according to claim 2, wherein the power supply circuit is added to a circuit that performs OFF control.