KR200147285Y1 - Combination capacitor patterning structure of a television tuner - Google Patents

Abstract

The present invention is a television tuner for improving reliability by patterning a coupling capacitor employed for signal coupling between an RF amplifying means, an inter-stage tuning means, and a signal mixing means in a television tuner tuner to a predetermined capacitance capacity. Provides a coupling capacitor patterning structure.

Accordingly, the present invention provides an RF amplifier 50 for high frequency amplifying the RF signal of television broadcasting, an intermittent tuning unit 54 for tuning an RF signal of a predetermined channel from the high frequency amplified RF signal, and the tuned RF signal. And a signal mixer 56 for mixing and oscillating a local oscillation signal as an intermediate frequency signal, the tuner of the RF amplifier 50, the inter-step tuner 54 and the signal mixer 56. Coupling capacitors 58 and 60, which are provided in between, and which perform signal coupling to RF signals of television broadcasting, are formed to be patterned as the first electrode pattern 62 and the second electrode pattern 64.

Description

Combined Capacitor Patterning Structure of Television Tuner

The present invention relates to a coupling capacitor patterning structure of a television tuner. More specifically, in the case of a tuner for tuning a television broadcast signal, the present invention relates to a signal combination between component circuits that tune-process and mix RF signals of a television broadcast signal. A coupling capacitor patterning structure of a television tuner for patterning coupling capacitors.

In general, a television is provided with a tuner for tuning a predetermined channel among a plurality of channels transmitted from a plurality of television stations. The tuner includes a VHF high band of 90 to 108 MHz and a video frequency of 170 to 222 MHz including video and audio information. 12 channels of high frequency (VHF) television broadcast signals, such as the VHF low band, and 50 channels of ultra high frequency (UHF) channels, such as the UHF band of 470-770 MHz, can be tuned. In addition, in the input circuit connected to the receiving antenna, it eliminates unnecessary signals and matches the input impedance of the high frequency amplification, and the amplification operation is performed to improve the signal to noise (SN) ratio through the high frequency amplification circuit. Meanwhile, in order to generate this television broadcast signal by converting it into a form of an intermediate frequency signal (IF signal), a frequency is set according to a desired channel. The local oscillation signal and the broadcast RF signal according to the desired channel are heterodyned.

According to the tuner in charge of the tuning of the broadcast RF signals of the VHF band and the UHF band, as shown in FIG. 1, a high frequency is applied to the RF signals of a plurality of VHF bands and UHF bands induced in a receiving antenna (not shown). VHF RF amplification unit 10 for high frequency amplifying the bandpass filtered RF signal to the VHF band with only high pass filtering, and high frequency amplifying the RF signal of the bandpass filtered UHF band with only the high pass filtered UHF band. The UHF RF amplification unit 12 and a VHF stage for tuning the RF signal of the corresponding channel by changing the inductance by receiving a tuning voltage for channel tuning of a predetermined VHF band from a control means such as a microcomputer (not shown) Tuning unit 14, UHF inter-terminal tuning unit 16 for tuning the RF signal of the corresponding channel by receiving a tuning voltage for channel tuning of a predetermined UHF band from the control unit and changing its capacitance, and the number of control thereof. The UHF band tuned by the UHF inter-step tuning unit 16 or the RF signal according to the channel of the VHF band tuned by the VHF inter-step tuning unit 14 by receiving the local oscillation frequency signal generated by the tuning voltage from the stage. Signal mixing unit 20 for mixing the RF signal according to the channel of the output signal as an intermediate frequency signal, the signal combination between the VHF RF amplifier 10 and the VHF stage interlocking unit 14 and the signal mixing unit 20 The coupling capacitors 22 and 26 which are respectively provided between the VHF RF amplifying unit 10, the VHF single-step tuning unit 14, and the signal mixing unit 20, and each have a predetermined capacitance, and the UHF RF For the signal coupling between the amplifier 12, the UHF stage interlock unit 16 and the signal mixer 20, the UHF RF amplifier 12 and the UHF stage interlock unit 16 and the signal mixer 20 It is composed of coupling capacitors 24 and 28 which are respectively provided between and have a predetermined capacitance capacity.

According to the tuner of the television having such a component, the RF signal of the VHF band is filtered through the reception antenna (not shown), and only the high frequency component is high pass filtered by the high pass filtering means, and only the VHF band is bandpass filtered. When the high frequency amplified by the VHF RF amplifying unit 10, the high frequency amplified RF signal passes through the coupling capacitor 22 for signal coupling, and the RF signal of a predetermined channel is tuned by the VHF single-phase tuning unit 14, and the coupling capacitor The RF signal according to the VHF band of the corresponding channel passing through 26 is mixed with the local oscillation frequency signal through the signal mixing unit 20 and output as an intermediate frequency signal.

In addition, for the RF signal of the UHF band, the RF signal of the UHF band, which has been amplified by the UHF RF amplifier 12, is supplied to the UHF inter-terminal tuning unit 16 through the coupling capacitor 24, and a predetermined channel is selected. The tuned UHF band RF signal passes through the coupling capacitor 28 and is output by the signal mixing section 20 as an intermediate frequency signal.

On the other hand, the coupling capacitors 22, 24, 26, and 28 employed in the television tuner for signal coupling between the component circuits have the first and second electrode plates 30 and 32 in which charge is accumulated, as shown in FIG. ) And an insulator 34 sandwiched between the first and second electrode plates 30 and 32, the capacitance of which is the area of the first and second electrode plates 30 and 32 and the insulator 34. Proportional capacitance is set so that the tuning frequency error of the RF signal is reduced in proportion to the insulation degree and inversely proportional to the distance between the electrode plates 30 and 32.

However, according to the coupling capacitors 22, 24, 26 and 28 employed in the television tuner, the VHF / UHF RF amplifiers 10 and 12 and the VHF / UHF stage are tuned at the time of coupling the circuit elements according to the manufacture of the tuner. The process for circuit connection with the constituent circuits constituting the units 14, 16 and the signal mixing unit 20 becomes difficult, and a separate circuit element is employed, so that a demanding circuit connection process is required. Disadvantages arise.

Accordingly, the present invention has been made in view of the above-described circumstances, and a pattern is adopted in which a tuning capacitor adapted for signal coupling between an RF amplifying means, an inter-step tuning means and a signal mixing means in a tuner tuner for television broadcasting is suitable for a predetermined capacitance capacity. It is an object of the present invention to provide a coupling capacitor patterning structure of a television tuner that can be improved by improving the reliability.

According to the coupling capacitor patterning structure of the television tuner according to the present invention to achieve the above object, the RF amplifier for high frequency amplification of the RF signal of television broadcasting, and the RF signal of a predetermined channel from the high frequency amplified RF signal A tuner of a television having a single phase tuning section and a signal mixing section for mixing the tuned RF signal and the local oscillation signal and outputting the signal as an intermediate frequency signal, each of which is provided between the RF amplifier section, the inter-step tuning section and the signal mixing section respectively; A coupling capacitor patterning structure of a television tuner is formed such that a coupling capacitor for signal coupling to an RF signal of television broadcasting is patterned as a first electrode pattern and a second electrode pattern.

Preferably, the first electrode pattern and the second electrode pattern of the coupling capacitor are patterned to have a predetermined distance to each other in the form of a plurality of irregularities.

In addition, the capacitance of the coupling capacitor is set to be proportional to the pattern area of the first electrode pattern and the second electrode pattern having the uneven shape, and the distance between the electrodes of the first electrode pattern and the second electrode pattern.

According to the present invention configured as described above, only the high frequency band is filtered by the tuner of the television, and the VHF / UHF RF amplification unit constituting circuit and tuning voltage for high frequency amplifying the bandpass filtered RF signal into the VHF band and the UHF band, respectively. Coupling capacitors which are signal-coupled between the component circuits of the VHF / UHF inter-terminal tuning section for tuning the RF signal of a predetermined channel, and a signal mixing the component circuits of the VHF / UHF inter-step tuning section with the tuned RF signal and the local oscillation frequency signal. The first and second electrodes of the coupling capacitor for signal coupling between the component circuits of the mixing section are patterned to have a predetermined capacitance to reduce the manufacturing process and to reduce the manufacturing cost.

1 is a view showing a state in which a conventional coupling capacitor is coupled in a conventional television tuner,

2 is a view showing a state in which a coupling capacitor patterning structure according to the present invention is employed in a television tuner;

3 is a view showing in detail the coupling structure of the patterned coupling capacitor shown in FIG.

Explanation of symbols on the main parts of the drawings

50: VHF RF amplifier, 52: field effect transistor,

54: VHF single phase tuning unit, 56: signal mixing unit,

58, 60: coupling capacitor, 62: first electrode pattern,

64: second electrode pattern, d1: pattern area,

d2: Distance between patterns.

Hereinafter, the present invention configured as described above will be described in detail with reference to the accompanying drawings.

That is, FIG. 2 is a view illustrating a state in which a coupling capacitor patterning structure according to the present invention is employed in a television tuner. According to the figure, only a high frequency component is filtered through a high pass component in a receiving antenna (not shown). A VHF RF amplifier unit in which only the VHF band amplifies the bandpass filtered RF signal through band pass filtering means (not shown), wherein the first gate terminal G1 of the VHF RF amplifier unit 50 is a resistor. It is connected between the terminal R5 and the capacitor C2, and is supplied with an AGC (Automatic Gain Control) voltage for gain control of the input signal, and the second gate terminal G2 is connected to the capacitor C1 in the VHF band. The RF signal is applied, and the source terminal S is connected to the input terminal of the RF signal through the resistors R1 and R2 and the resistors R4 and R5 connected in parallel, respectively, and the drain terminal D is described later. The mouth of the VHF inter-stage tuning unit 54 via a coupling capacitor 58 to It is configured to include an end connected to the field effect transistor 48.

Also, in the figure, the VHF stage interlocking unit 54 converts the inductance capacities of the first and second inductors L1 and L2 by the channel tuning voltage supplied from the control means (not shown). The RF signal of the channel to be tuned is tuned from the RF signal. Here, reference numerals DT1 and DT2 denote variable capacitance diodes.

Further, the signal mixing section 56 mixes the RF signal of the VHF band tuned from the VHF inter-step tuning section 54 with the local oscillation frequency signal generated by the channel tuning voltage from the control means as an intermediate frequency signal. Will print.

And, between the coupling capacitor 58 and the VHF single-step tuning unit 54 and the signal mixing unit 56 connected for signal coupling between the VHF RF amplifier 50 and the VHF single-step tuning unit 54. The coupling capacitor 60 connected for signal coupling to the first electrode pattern 62 and the second electrode pattern 64 is formed in a patterned manner, and the first and second electrode patterns 62 and 64 are formed. It is formed to have a plurality of irregularities with each other alternately cross.

Here, the capacitance of the coupling capacitor (58, 60), as shown in Figure 3 has a plurality of concave-convex shape with each other and vary depending on the degree of increase and decrease patterning of the electrode area (d1) of the alternating intersection, It varies depending on the increase and decrease patterning of the inter-electrode distance d2 between the crossed portion and the portion.

In addition, the present invention is applied to the coupling capacitor (58, 60) for the signal combination between the components of the RF signal of the VHF band by the high-frequency amplification, the component for the RF signal of the UHF band, that is, UHF RF It is a matter of course that the coupling capacitors 58 and 60 in which the first and second electrode patterns 62 and 64 are patterned for the signal coupling between the amplification means, the UHF stage interlocking means and the signal mixing section 56 are applicable.

Next, the operation of the present invention made as described above will be described in detail with reference to FIG.

First, when the RF signal of the VHF band is filtered through the bandpass filtering means among the broadcast RF signals of the multichannel broadcasted by the reception antenna (not shown) and filtered only by the high pass band through the high pass filtering means, the VHF RF amplifying unit The field effect transistor 52 of 50 has a high frequency amplified RF signal corresponding to the VHF band through the second gate terminal G2 in the state where the AGC voltage is supplied through the first gate terminal G1, and the drain thereof. The patterned first and second electrode patterns 62 and 64 of the coupling capacitor 58, which are output through the terminal D and whose RF signal from the drain terminal D is provided with the VHF band, provide a signal coupling function. Supplied to the VHF inter-step tuning unit 54, corresponding to the electrode area d1 and the distance between the electrodes d2 by the first and second electrode patterns 62 and 64 of the coupling capacitor 58; It stably passes according to the capacitance capacity set.

Then, the VHF inter-terminal tuning section 54 varies the inductance capacity of the first and second inductors L1 and L2 by the channel tuning voltage for the predetermined channel tuning from the control means (not shown). The RF signal of the corresponding channel is tuned from the RF signal of the VHF band through the coupling capacitor 58, while the RF signal of the predetermined channel tuned by the VHF inter-step tuning unit 54 is connected to the coupling capacitor 60. The first and second electrode patterns 62 and 64 are stably passed through the patterned electrode area d1 and the capacitance capacitance proportional to the distance d2 between the electrodes, and are supplied to the signal mixing unit 56.

Accordingly, the signal mixer 56 mixes the RF signal of the predetermined channel passed by the coupling capacitor 60 and the local oscillation frequency signal generated by the channel tuning voltage and outputs the signal as an intermediate frequency signal. do.

According to the present invention made as described above, in the channel tuning tuner of the television, the electrode terminal of the coupling capacitor is arranged between the high frequency amplification of the RF signal of the VHF / UHF band and the components responsible for tuning the signal coupling By patterning to have a stable capacitance capacity, there is an advantage that the manufacturing cost and the manufacturing process can be reduced by eliminating the need to connect the conventional capacitor circuit elements separately.

Claims (3)

An RF amplifier 50 for high frequency amplifying the RF signal of television broadcasting, an inter-step tuning unit 54 for tuning an RF signal of a predetermined channel from the high frequency amplified RF signal, and the tuned RF signal and a local oscillation signal A television tuner having a signal mixing section 56 for mixing and outputting as an intermediate frequency signal, Coupling capacitors 58 and 60, which are installed between the RF amplifier 50, the inter-terminal tuning unit 54, and the signal mixing unit 56, respectively, perform signal combining with respect to the RF signal of television broadcasting. And a coupling capacitor patterning structure of a television tuner, characterized in that it is patterned as (62) and a second electrode pattern (64). The method of claim 1, wherein the first electrode pattern 62 and the second electrode pattern 64 of the coupling capacitor (58, 60) is patterned to have a predetermined distance to each other in the form of a plurality of irregularities. Combined Capacitor Patterning Structure for Television Tuners. The capacitance of the coupling capacitors 58 and 60 has a pattern area d1 of the first electrode pattern 62 and the second electrode pattern 64 and the first electrode thereof, respectively. And a coupling capacitor patterning structure for a television tuner, characterized in that it is set in proportion to the distance d2 between the electrodes of the pattern 62 and the second electrode pattern 64.