KR101762949B1 - Circuit for Filter Switching - Google Patents
Circuit for Filter Switching Download PDFInfo
- Publication number
- KR101762949B1 KR101762949B1 KR1020100118676A KR20100118676A KR101762949B1 KR 101762949 B1 KR101762949 B1 KR 101762949B1 KR 1020100118676 A KR1020100118676 A KR 1020100118676A KR 20100118676 A KR20100118676 A KR 20100118676A KR 101762949 B1 KR101762949 B1 KR 101762949B1
- Authority
- KR
- South Korea
- Prior art keywords
- signal
- saw filter
- filter unit
- diode
- electrically connected
- Prior art date
Links
Images
Landscapes
- Electronic Switches (AREA)
Abstract
The present invention relates to a filter switching circuit.
A filter switching circuit according to an embodiment of the present invention receives a first signal from a switching Saw filter unit and a CTR stage and provides an input signal to a first input terminal of a switching Saw filter unit and a second input terminal of a switching Saw filter unit, And a signal controller for receiving a second signal different from the first signal and providing a reference signal to a second input terminal of the switching saw filter unit.
Description
The present invention relates to a filter switching circuit.
The DVB-T broadcasting system has a channel bandwidth of 7 MHZ at 300 MHz or lower and a channel bandwidth of 8 MHz at 300 MHz or higher. Therefore, the DVB-T tuner was used by switching the Saw Filter to IF out and 7 / 8MHz.
Conventionally, in the Saw Filter Switching circuit, Saw Filter Switching was operated by controlling ON or OFF of the P5 terminal of the MOPLL IC.
On the other hand, in most of the Saw filters, the switching circuit operates, whereas in some Saw Filters, the switching circuit does not operate properly, and the Group delay characteristic and the filter characteristic are deteriorated .
It is an object of the present invention to provide a filter switching circuit capable of deteriorating Group Delay characteristics and Filter characteristics by disposing a signal control unit according to an embodiment.
The filter switching circuit according to the embodiment includes a switching Saw filter unit; And a second diode connected in series with the first diode. The first diode receives the first signal from the CTR terminal and receives the input signal to the first input terminal of the switching saw filter unit and the second input terminal of the switching saw filter unit A signal controller for receiving a second signal different from the first signal from the CTR stage and providing a reference signal to a second input of the switching saw filter unit; And a voltage distributor for dividing the voltage provided to the Vcc stage and applying a different voltage to the first input terminal of the switching Saw filter unit and the second input terminal of the switching Saw filter unit, The anode terminal of the second diode is electrically connected in common to the cathode terminal of the first diode and the second input terminal of the switching Saw filter section, 2 diode is electrically connected to a reference voltage source, and the voltage divider has one end of the first resistor electrically connected to the CTR stage, the other end of the first resistor is electrically connected to the Vcc stage, The other end of the second resistor is electrically connected to the Vcc terminal, and the third terminal of the third resistor is electrically connected to the third input terminal, One end of the resistor may be electrically connected to the VTR stage, and the other end of the third resistor may be electrically connected to the second input terminal.
The filter switching circuit according to the embodiment has an effect that the group delay characteristic and the filter characteristic can be deteriorated by arranging the signal control portion.
In addition, the filter switching circuit according to the embodiment has an effect that the reliability of the product can be improved by disposing the signal control unit to deteriorate the group delay characteristic and the filter characteristic.
1 is intended to describe a filter switching circuit according to an embodiment of the present invention.
FIG. 2 and FIG. 3 illustrate the operation of the filter switching circuit according to an embodiment of the present invention.
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is for explaining a filter switching circuit according to an embodiment of the present invention, and FIGS. 2 and 3 are for explaining the operation of a filter switching circuit according to an embodiment of the present invention.
Referring to FIG. 1, the
The switching
The
At this time, the
The
A different voltage is applied to the first input terminal Input1 of the switching
The connection relationship of the
The other end of the first capacitor C1 is connected to one end of the second resistor R2 and the other end of the fourth resistor R4 is connected to the other end of the first diode D1. And the first
The CTR stage is electrically connected to one end of the third resistor R3 of the first resistor R1 and the other end of the third resistor R3 is connected to the cathode terminal K of the first diode D1, The anode terminal A of the diode D2 and the second input terminal Input2 of the switching
The VCC stage is electrically connected in common to the other end of the second resistor R2 of the first resistor R1.
The operation of the
Referring to FIG. 2, a first signal is provided from a CTR stage. Referring to FIG. 3, a second signal is provided from a CTR stage.
First, when the first signal is provided from the CTR stage, a voltage of about 1 V is applied to the first input terminal Input1 of the switching
When the second signal is provided from the CTR stage, a voltage of about 1 V is applied to the first
As described above, the second input terminal Input2 of the switching
That is, AC GND and DC GND are stably operated at the second input (Input 2) of the switching
It will be understood by those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. Therefore, it should be understood that the above-described embodiments are to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than the foregoing description, It is intended that all changes and modifications derived from the equivalent concept be included within the scope of the present invention.
100: Filter switching circuit 110: Switching Saw filter unit
120: Signal control unit 130: Voltage distribution unit
Claims (6)
And a second diode connected in series with the first diode. The first diode receives the first signal from the CTR terminal and receives the input signal to the first input terminal of the switching saw filter unit and the second input terminal of the switching saw filter unit A signal controller for receiving a second signal different from the first signal from the CTR stage and providing a reference signal to a second input of the switching saw filter unit; And
And a voltage distributor for distributing a voltage provided to the Vcc stage so that different voltages are applied to the first input terminal of the switching Saw filter unit and the second input terminal of the switching Saw filter unit,
Wherein the signal control unit is configured such that the anode terminal of the first diode is electrically connected to the first input terminal of the switching Saw filter unit and the anode terminal of the second diode is connected to the cathode terminal of the first diode and the second input terminal of the switching Saw filter unit, The cathode terminal of the second diode is electrically connected to the reference voltage source,
Wherein the voltage divider has a voltage dividing section that has one end of the first resistor electrically connected to the CTR stage, the other end of the first resistor being electrically connected to the Vcc terminal, one end of the second resistor being electrically connected to the first input terminal, The other end of the second resistor is electrically connected to the Vcc stage, the one end of the third resistor is electrically connected to the VTR stage, and the other end of the third resistor is electrically connected to the second input terminal.
Further comprising a first capacitor electrically connected at one end to the IF stage and electrically connected at the other end to the first input terminal.
Wherein the first diode is operated when the first signal is provided to the signal control unit, and the second diode is operated when the second signal is provided.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020100118676A KR101762949B1 (en) | 2010-11-26 | 2010-11-26 | Circuit for Filter Switching |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020100118676A KR101762949B1 (en) | 2010-11-26 | 2010-11-26 | Circuit for Filter Switching |
Publications (2)
Publication Number | Publication Date |
---|---|
KR20120057094A KR20120057094A (en) | 2012-06-05 |
KR101762949B1 true KR101762949B1 (en) | 2017-07-28 |
Family
ID=46609028
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
KR1020100118676A KR101762949B1 (en) | 2010-11-26 | 2010-11-26 | Circuit for Filter Switching |
Country Status (1)
Country | Link |
---|---|
KR (1) | KR101762949B1 (en) |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2682010B2 (en) * | 1988-05-30 | 1997-11-26 | 日本電気株式会社 | Antenna shared circuit |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100328492B1 (en) * | 1999-12-10 | 2002-03-16 | 송재인 | Three band tracking filter for digital satellite broadcasting tuner |
KR20080051609A (en) * | 2006-12-06 | 2008-06-11 | 엘지이노텍 주식회사 | Switching circuit of if saw filter |
KR20090022004A (en) * | 2007-08-29 | 2009-03-04 | 엘지이노텍 주식회사 | Switching circuit of if saw filter |
-
2010
- 2010-11-26 KR KR1020100118676A patent/KR101762949B1/en active IP Right Grant
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2682010B2 (en) * | 1988-05-30 | 1997-11-26 | 日本電気株式会社 | Antenna shared circuit |
Also Published As
Publication number | Publication date |
---|---|
KR20120057094A (en) | 2012-06-05 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP2704280A2 (en) | Power distribution cabinet | |
EP2977989B1 (en) | Sample-and-hold circuit for an interleaved analog-to-digital converter | |
US20110012682A1 (en) | Electronic circuit with cascode amplifier | |
US9985627B2 (en) | Drive circuit and module equipped with same | |
CN103425219A (en) | Power supply control system and method | |
US20180068800A1 (en) | Bst capacitor control | |
WO2015130885A1 (en) | Bias circuits and methods for stacked devices | |
EP3453231A1 (en) | Motor vehicle illumination device | |
DE102013226635B4 (en) | Doherty amplifier with additional delay element | |
KR101762949B1 (en) | Circuit for Filter Switching | |
US8476875B2 (en) | TV set top box with an improved ability to survive a transient signal | |
CN108923645B (en) | Switching power supply circuit with line loss compensation | |
EP2752980B1 (en) | Undervoltage cut-off switch for use between load and power supply with output filter capacitor | |
EP3195697B1 (en) | Circuit assembly for operating at least a first and a second cascade of leds | |
US7583556B2 (en) | Switching circuit for CMOS circuit | |
CN103809649A (en) | Control circuit capable of achieving sequential control over output voltage | |
CN102169674A (en) | Dynamic load adjusting module, liquid crystal display device and voltage adjusting method | |
WO2011135097A1 (en) | Interface circuit and method for influencing the edge steepness of a control pulse | |
US20130241033A1 (en) | Intergrated circuit and wireless communication apparatus | |
CN201156788Y (en) | High frequency head power supply circuit and audio and video receiving apparatus having the circuit | |
US9577526B2 (en) | Voltage adjusting apparatus with jumper | |
CN211790738U (en) | CVBS input/output protection circuit, CVBS interface, reversing image system and vehicle | |
KR101693863B1 (en) | System for driving tuner | |
US20090072808A1 (en) | Start-up circuit and method for high voltage power distribution circuit | |
US9093972B2 (en) | Limiting circuit |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
A201 | Request for examination | ||
E902 | Notification of reason for refusal | ||
E701 | Decision to grant or registration of patent right | ||
GRNT | Written decision to grant |