CN206251057U

CN206251057U - System SOC and Tuner SOC crystal oscillating circuits

Info

Publication number: CN206251057U
Application number: CN201621289535.6U
Authority: CN
Inventors: 汪海林; 史青
Original assignee: Sichuan Changhong Electric Co Ltd
Current assignee: Sichuan Changhong Electric Co Ltd
Priority date: 2016-11-29
Filing date: 2016-11-29
Publication date: 2017-06-13
Anticipated expiration: 2026-11-29

Abstract

The utility model is related to system SOC and Tuner the SOC crystal oscillating circuit technologies of TV, and the utility model solves the problems, such as that the Tuner SOC needs one of LCD TV are individually outer and supplies crystal oscillator, there is provided a kind of system SOC and Tuner SOC crystal oscillating circuits.The utility model scheme is：System SOC and Tuner SOC crystal oscillating circuits, including supplying crystal oscillating circuit, resistance, electric capacity four and Tuner SOC outside system SOC, it is characterized in that, also include trapper, described resistance one end is connected with outside system SOC for crystal oscillating circuit, the other end is connected with trapper, and the one end of electric capacity four is connected with trapper, and the other end is connected with Tuner SOC.This circuit is eliminated in traditional approach and supplies crystal oscillator outside Tuner SOC, obtains the working frequency of stabilization for crystal oscillator from outside system SOC, is realized two modules and is shared a mode of operation for crystal oscillator.The beneficial effects of the utility model are to reduce material state and cost, while simplifying circuit design, it is adaptable to LCD TV.

Description

System SOC and Tuner SOC crystal oscillating circuits

Technical field

The utility model is related to liquid crystal tv technology, more particularly to system SOC and Tuner SOC crystal oscillating circuit technologies.

Background technology

Tuner modules are one very important modules of TV in liquid crystal television system, and traditional liquid crystal television system SOC is needed The working frequency (such as 24Mhz crystal oscillators) of stabilization is provided for it for crystal oscillator X1 outward, while Tuner SOC need to supply crystal oscillator outside individually X2 provides the working frequency (such as 16Mhz crystal oscillators) of stabilization for it.Operating diagram is as shown in annex map 1.The utility model is cancelled Tuner SOC specialize in crystal oscillator X2 (such as 16Mhz crystal oscillators) in traditional approach, are obtained for crystal oscillator X1 (such as 24Mhz) from outside system SOC The working frequency of stabilization, realizes that Tuner SOC and system SOC shares a mode of operation for crystal oscillator X1 (such as 24Mhz), its work Schematic diagram is as shown in Fig. 2 its circuit theory diagrams is as shown in Figure 3.

Utility model content

The purpose of this utility model is to propose a kind of system SOC and Tuner SOC crystal oscillating circuits, solves LCD TV TunerSOC needs an individually outer problem for crystal oscillator.

The utility model solves its technical problem, and the technical scheme of use is：System SOC and Tuner SOC crystal oscillating circuits, Including supplying crystal oscillating circuit, resistance, electric capacity four and Tuner SOC outside system SOC, it is characterised in that also including trapper, the institute State resistance one end to be connected for crystal oscillating circuit with outside system SOC, the other end is connected with trapper, the one end of electric capacity four connects with trapper Connect, the other end is connected with Tuner SOC.

The resistance is current-limiting resistance.

Electric capacity four is filter capacitor, for filtering DC level.

The trapper includes inductance, electric capacity three and ground wire, one end of the electric capacity three and inductance connection, the other end and ground Line is connected.

The trapper, the harmonic wave for filtering 50Mhz frequencies below is disturbed.

The beneficial effects of the utility model are, by said system SOC and Tuner SOC crystal oscillating circuits, to reduce material State and cost, while simplifying circuit design, it is to avoid Tuner SOC need the individually outer problems for crystal oscillators.

Brief description of the drawings

Fig. 1 is the operating diagram of conventional television system and Tuner.

Fig. 2 is the utility model system SOC and Tuner SOC crystal oscillating circuit operating diagrams.

Fig. 3 is the utility model system SOC and Tuner SOC crystal oscillating circuit circuit theory diagrams.

Wherein, crystal oscillator X1 specializes in crystal oscillator for system SOC, and crystal oscillator X2 specializes in crystal oscillator for Tuner SOC, and VIF is radiofrequency signal By the relatively low intermediate-freuqncy signal of the frequency exported after Tuner tunings, video and audio signal are modulated with above.C1 is load capacitance First, C2 is load capacitance two, and R1 is current-limiting resistance, and C4 is filter capacitor, and L1 is inductance, and C3 is electric capacity.

Specific embodiment

Below in conjunction with the accompanying drawings and embodiment, the technical solution of the utility model is described in detail.

It is described in the utility model state system SOC and Tuner SOC crystal oscillating circuits by outside system SOC for crystal oscillating circuit, resistance, Electric capacity four, Tuner SOC and trapper composition, wherein, resistance one end is connected with outside system SOC for crystal oscillating circuit, the other end and Trapper is connected, and the one end of electric capacity four is connected with trapper, and the other end is connected with Tuner SOC, its circuit theory diagrams such as Fig. 3 institutes Show.The utility model circuit is eliminated in traditional approach outside Tuner SOC for crystal oscillator X2, from outside system SOC for crystal oscillator X1 acquisitions The working frequency of stabilization, realizes two modules and shares a mode of operation for crystal oscillator.

Embodiment

System SOC and Tuner SOC crystal oscillating circuits, including system are stated in the utility model embodiment liquid crystal television system Crystal oscillating circuit, resistance R1, electric capacity four C4, Tuner SOC and trapper are supplied outside SOC, wherein, outside resistance R1 one end and system SOC For crystal oscillating circuit connection, the other end is connected with trapper, and the C4 one end of electric capacity four is connected with trapper, the other end and Tuner SOC Connection；In foregoing circuit, resistance R1 is current-limiting resistance；The C4 of electric capacity four is filter capacitor, for filtering DC level；Trapper is used Disturbed in the harmonic wave for filtering 50Mhz frequencies below, including inductance L1, the C3 of electric capacity three and ground wire, one end of the C3 of electric capacity three and inductance L1 is connected, and the other end is connected with ground wire.

Specifically, include system SOC, crystal oscillator X1, the C1 of electric capacity one, the C2 of electric capacity two and ground wire for crystal oscillating circuit outside system SOC, Wherein, crystal oscillator X1 is 24Mhz, by entering system SOC systems after load capacitance C1, C2, the work of stabilization is provided for system SOC Frequency (24Mhz), this working frequency worked asynchronously with SOC internal oscillator collective effect generation systems SOC need the wave of oscillation Shape, it is ensured that system SOC normal works.

Meanwhile, crystal oscillator X1 by inductance L1 and electric capacity C3 by, by current-limiting resistance R1, filtering afterwards after load capacitance C1, C2 Except the harmonic wave of 50Mhz frequencies below is disturbed, eventually pass filter capacitor C4 and filter DC level, be Tuner into Tuner SOC There is provided the working frequency (16Mhz) of stabilization, it is ensured that Tuner module normal works.

Claims

1. system SOC and Tuner SOC crystal oscillating circuits, including crystal oscillating circuit, resistance, electric capacity four and Tuner are supplied outside system SOC SOC, it is characterised in that also including trapper, described resistance one end is connected with outside system SOC for crystal oscillating circuit, the other end with fall into Ripple device is connected, and the one end of electric capacity four is connected with trapper, and the other end is connected with Tuner SOC.

2. system SOC according to claim 1 and Tuner SOC crystal oscillating circuits, it is characterised in that the resistance is current limliting Resistance.

3. system SOC according to claim 1 and Tuner SOC crystal oscillating circuits, it is characterised in that the electric capacity four is filter Ripple electric capacity, for filtering DC level.

4. system SOC according to claim 1 and Tuner SOC crystal oscillating circuits, it is characterised in that the trapper includes Inductance, electric capacity three and ground wire, one end of the electric capacity three and inductance connection, the other end are connected with ground wire.

5. system SOC according to claim 4 and Tuner SOC crystal oscillating circuits, it is characterised in that the trapper, use Disturbed in the harmonic wave for filtering 50Mhz frequencies below.