JPS5854115U - High frequency oscillator frequency switching circuit - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of drawings]

Figure 1 is a circuit diagram showing the equivalent circuit of a crystal resonator, Figure 2 is a circuit diagram showing the equivalent circuit of a general oscillation circuit that operates a crystal resonator, and Figure 3 is a load capacitance in series with the crystal resonator. 4 is a circuit diagram showing an equivalent circuit of the circuit shown in FIG. 3, and FIG. 5 is a circuit diagram showing an oscillation circuit using a conventional crystal resonator. 6 and 7 are circuit diagrams showing the switching state of the conventional example shown in FIG. 5, FIG. 8 is a circuit diagram showing an equivalent circuit of FIG. 6, and FIG. 9 is a circuit diagram showing an embodiment of the present invention. , FIGS. 10 and 11 are circuit diagrams showing switching states of the embodiment shown in FIG. 9, and FIG. 12 is a circuit diagram showing an equivalent circuit of FIG. 10. 7...Oscillation circuit, 8,9...Crystal resonator, 10...Mechanical switch, 11-13...
... Fixed contact, 14... Movable contact, 15.
16... Stray capacitance.

Claims (1)

[Scope of utility model registration request] 1. A frequency switching circuit for a high-frequency oscillator, characterized in that the oscillation circuit changes the oscillation frequency by switching resonant elements using a switch, and is provided with a switch to short-circuit unused resonant elements.