Tracking wave filter and correction device thereof
A tracking filter and correction device technology, applied in TV, impedance network, digital technology network, etc., can solve the problems of poor high-frequency rejection characteristics of LC tracking filter, complex correction circuit, long correction time, etc., to achieve optimal high frequency Rejection characteristics, high quality factor, effect of shortened calibration time
Inactive Publication Date: 2010-09-08
SUNPLUS TECH CO LTD
View PDF3 Cites 4 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
At Figure 4D It can be seen that the high-frequency rejection characteristics of the LC tracking filter are so poor that they are susceptible to the multiplier interference of the local oscillator signal LO (LO harmonic interferences)
[0017] Furthermore, since the tracking filter will be affected by temperature, process drift, and parasitic effects on the circuit board
Correction is required when using the tracking filter, however, it takes a long time to correct the tracking filter, and the correction circuit is very complicated
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0059] In order to make the object, technical solution and advantages of the present invention clearer, the solutions of the present invention will be further described in detail below with reference to the accompanying drawings and examples.
[0060] Please refer to Figure 5A , which shows the first embodiment of the tracking filter of the present invention. The tracking filter includes: a first buffer 510 , a second buffer 520 , an impedance converter Cs and a resonator 515 . The resonator 515 includes: an inductor Ls, a first capacitor unit Cp1 and a second capacitor unit Cp2. The signal input terminal (Vin) is connected to the input terminal of the first buffer 510 so that the buffer can receive the input signal, and the impedance converter Cs is connected between the output terminal of the first buffer 510 and the node a; the node a and the input of the second buffer 520 The inductance Ls is connected between the terminals; the first capacitor unit Cp1 is connected bet...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses a tracking wave filter, which is used for a television receiver. The tracking wave filter comprises a first buffer device, an impedance converter, an inductor, a fist capacitor unit, a second capacitor unit and a second buffer device, wherein the first buffer device is provided with the input end used for receiving input signals; the impedance converter is provided with the first end connected to the output end of the first buffer device, the inductor is provided with the first end connected to the second end of the impedance converter, the first capacitor unit is connected between the second end of the impedance converter and the grounding end, the second capacitor unit is connected between the second end of the inductor and the grounding end, and the second buffer device is provided with the input end connected to the second end of the inductor and the output end capable of generating an output signal. The tracking wave filter can obtain good high-frequency rejection characteristics only through one inductor, wherein when the impedance converter, the first capacitor unit and the second capacitor unit are added at the same time, the operation frequency of the output signal can be reduced, and a gain value between the output signal and the input signal maintains unchanged. At the same time, the invention also discloses a correction device, which can shorten the correction time of the tracking wave filter.
Description
technical field [0001] The present invention relates to a tracking filter and its correction device, especially a tracking filter with high linearity and its digital correction device. Background technique [0002] Please refer to figure 1 , which is a structural diagram of a conventional TV tuner. The television receiver 100 includes a low noise amplifier (Low Noise Amplifier, LNA) 101, a tracking filter 103 (tracking filter), a band-pass filter (band-pass filter) 105, a quadrature signal generator (quadrature generator) 107, RF Clock synthesizer (RF clock synthesizer) 111, phase shifter (phase shifter) 113, double quadrature signal mixer (double quadrature mixers) 115, polyphase filter unit (polyphase filter unit) 117, variable gain amplifier Amplifying unit 119 and channel select filter unit 121 . [0003] The low noise amplifier 101 amplifies the RF signal to an appropriate level after receiving an RF signal (or broadband TV signal) transmitted from an antenna (not sh...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Applications(China)
IPC IPC(8): H03H17/00H04N5/44
Inventor 吴昭篁
Owner SUNPLUS TECH CO LTD