KR19990009990A - Oscillator circuit of tuner - Google Patents

Abstract

The present invention relates to an oscillator circuit of a tuner, wherein unwanted oscillation signals are removed from the antenna, and the desired oscillation is adjusted by adjusting the high and low signals of the VHF band in the process of selecting and tuning a high frequency signal of a desired band. In the oscillator circuit of the tutor to obtain the frequency, it comprises a VHF high / low signal single adjuster connected in parallel between the first capacitor and the inductor connected in series to simultaneously adjust the VHF high signal and the low signal. That is, the VHF high / low signal single adjuster is connected in parallel between the first capacitor and the inductor connected in series so as to simultaneously adjust the VHF high signal and the low signal, thereby making unnecessary noise in the high frequency signal induced from the antenna. Remove the signal and select the high frequency signal of the desired band In the process of tuning, the oscillation frequency of the desired VHF band can be stably obtained by one adjustment of the VHF high / low signal single adjustment unit, and at the same time, the configuration can be simplified, thereby improving productivity and function. Excellent effect

Description

Oscillator circuit of tuner

The present invention relates to an oscillator circuit of a tuner, and more particularly, by providing a VHF high / low signal single adjuster connected in parallel between a first capacitor and an inductor to simultaneously adjust a VHF high signal and a low signal. An oscillator circuit of a tuner capable of stably obtaining an oscillation frequency of a VHF band.

In general, the tuner removes unnecessary noise signals from the high frequency signal induced from the antenna and selects and tunes a high frequency signal of a desired band, where a high signal and a low signal of the VHF band are used. The oscillation circuit of the tuner which obtains the oscillation frequency by adjusting of will be described.

1 is a circuit diagram showing an oscillator circuit of a tuner according to the prior art.

As shown in FIG. 1, the oscillator circuit of the tuner according to the related art is connected by a diode D1 between a first inductor L1 and a second inductor L2 connected in series to adjust a VHF high signal. A VHF low signal adjustment unit 20 connected in parallel between a VHF high signal adjustment unit 10 and a first capacitor C1 connected in series with the second inductor L2 to adjust a VHF low signal, and the first capacitor A grounded low sulfur R connected in parallel with C1, and a second capacitor C2 and a varactor diode D2 connected in parallel to the first inductor L1 and sequentially connected to each other in series.

A selection operation of the VHF band signal of the oscillator circuit of the tuner according to the related art having the above configuration will be described below.

In order to remove unnecessary noise signals from the high frequency signals induced from the antenna (not shown) and to select and tune the high frequency signals of the desired band, first, the VHF high signal adjusting unit 10 is obtained. By adjusting the VHF high signal through the VHF low signal adjusting unit 20 in order to obtain the oscillation frequency of the desired VHF band.

However, the oscillator circuit of the tuner according to the related art, which achieves the above-described configuration and operation, removes unnecessary noise signals from the high frequency signals induced from the antenna, and selects and tunes the high frequency signals of the desired band. In order to obtain a predetermined oscillation frequency, since the VHF high signal adjusting unit 10 and the VHF low signal adjusting unit 20 are separately configured, not only the circuit configuration is difficult but also the VHF high signal must be adjusted and then the VHF low signal must be sequentially adjusted. Because of this, there was a big disadvantage that comes with difficulty in frequency tuning.

Accordingly, the present invention has been made to solve the above-mentioned problems, and a single VHF high / low signal between the first capacitor and the inductor connected in series to simultaneously adjust the VHF high signal and the low signal for the purpose. By providing a structure in which the adjuster is connected in parallel, it is possible to stably obtain the oscillation frequency of the desired VHF band and to provide an oscillator circuit of the tuner capable of simplifying the configuration.

1 is a circuit diagram showing an oscillator circuit of a tuner according to the prior art.

2 is a circuit diagram showing an oscillator circuit of a tuner according to the present invention

Explanation of symbols for the main parts of the drawings

100: VHF high / low signal single adjuster C1: first capacitor

C2: second capacitor C3: third capacitor

C4: fourth capacitor D1: varactor diode

L: Inductor R: Resistance

Accordingly, the oscillator circuit of the tuner according to the present invention for achieving the above object, the high signal and low in the VHF band in the process of removing unnecessary noise signal of the high frequency signal induced from the antenna and selecting and tuning the high frequency signal of the desired band In an oscillator circuit of a tuner for obtaining a desired oscillation frequency by adjusting a signal, a single VHF high / low signal connected in parallel between a first capacitor and an inductor connected in series to simultaneously adjust the VHF high signal and a low path. It includes an adjustment unit.

In addition to the above configuration, a resistor connected in parallel and grounded between the first capacitor and the inductor, a second capacitor and a varactor diode connected in series with each other in parallel with the inductor, and connected in parallel with the second capacitor It is preferable that a third capacitor and a fourth capacitor are sequentially provided.

Hereinafter, a preferred embodiment of the oscillator circuit of the tuner according to the present invention will be described with reference to FIG.

2 is a circuit diagram showing an oscillator circuit of a tuner according to the present invention.

As shown in FIG. 2, the oscillator circuit of the tuner according to the present invention is connected in parallel between the first capacitor C1 and the inductor L connected in series to allow the VHF high signal and the low signal to be simultaneously adjusted. And a low signal single adjusting unit 100, a resistor R connected in parallel between the first capacitor C1 and the inductor L, and a ground connected to the inductor L, and sequentially connected in series to each other. And a second capacitor C2 and a varactor diode D1, and a second capacitor C3 and a fourth capacitor C4 connected in parallel with each other and connected in series with each other.

The oscillator circuit of the tuner according to the present invention having the above configuration has a single VHF high / low signal adjusting unit 100 between the first capacitor C1 and the inductor L connected in series to simultaneously adjust the VHF high signal and the low signal. In the process of removing the unnecessary noise signal from the high frequency signal induced from the antenna by selecting the parallel connection structure, and selecting and tuning the high frequency signal of the desired band, a single adjustment of the VKF high / low signal single adjusting unit 100 is desired. The oscillation frequency of the VHF band can be obtained.

In addition, a resistor R connected in parallel between the first capacitor C1 and the inductor L and grounded, and a second capacitor C2 and varactor connected in parallel with each other in series with the inductor L are connected in series. The third capacitor C3 and the fourth capacitor C4 connected to the diode D1 and the second capacitor C2 in parallel and connected in series with each other are respectively connected to the VHF high / low signal single adjuster 100. In conjunction with this, the tuning function of the tuner in the desired frequency band can be more accurately performed.

As described above, the oscillator circuit of the tuner according to the present invention has a structure in which the VHF high / low signal single adjuster is connected in parallel between the first capacitor and the inductor connected in series to simultaneously adjust the VHF high signal and the low signal. In the process of removing unnecessary noise signal from the high frequency signal induced from the antenna and selecting and tuning the high frequency signal of the desired band, the oscillation frequency of the desired VHF band can be stably obtained by one adjustment of the single VHF high / low signal adjusting unit. In addition, the simplification of the configuration is possible, which has an excellent effect of improving productivity and function.

Claims (2)

In the oscillator circuit of the tuner to obtain a desired oscillation frequency by adjusting the high and low signals of the VHF band in the process of removing unnecessary noise signals from the high frequency signals induced from the antenna and selecting and tuning the high frequency signals of the desired band. , An oscillator circuit of a tuner comprising a single adjuster of a VHF high / low signal connected in parallel between a first capacitor and an inductor connected in series to simultaneously adjust the VHF high signal and a low signal The method of claim 1, A grounded resistor connected in parallel between the first capacitor and the inductor; A second capacitor and a varactor diode connected in series with each other in parallel with the inductor; An oscillator circuit of the tuner, further comprising a third capacitor and a fourth capacitor connected in parallel to the second capacitor and sequentially connected to each other in series;