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Phase synchronication circuit and television signal reception circuit

A phase synchronization and circuit technology, which is applied in the adjustment of TV, color TV, resonant circuit, etc., can solve the problem that the line filter cannot fully exert the function expected by the design, and achieve the effect of preventing the decline of filter characteristics

Inactive Publication Date: 2013-03-27
ALPS ALPINE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, there is a problem that the line filter cannot fully perform the function expected by the design due to the capacitance change of the capacitor C.

Method used

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  • Phase synchronication circuit and television signal reception circuit
  • Phase synchronication circuit and television signal reception circuit
  • Phase synchronication circuit and television signal reception circuit

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Embodiment Construction

[0055] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

[0056] figure 1 It is a configuration diagram of a television signal receiving circuit including a phase synchronization circuit according to the present embodiment. The television signal receiving circuit 10 according to the present embodiment includes: an antenna 11 for receiving broadcast waves as a television signal; ); high-frequency amplifier 13, it amplifies the TV receiving signal (RF signal) that extracts; RF tuner circuit 14, it extracts the desired frequency band that comprises receiving channel from the TV receiving signal (RF signal) after the amplification; Circuit 15, which converts the frequency of the television reception signal (RF signal) extracted by the RF tuning circuit into an intermediate frequency signal (IF signal); an IF filter circuit 16, which extracts the IF signal from the output signal of the mixing circuit 15; and stage ci...

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Abstract

The invention provides a phase synchronication circuit which aims to prevent the decreasing of the filter characteristics of the line filter on a tuning line. The phase synchronization circuit includes a low-pass filter (19) configured to integrate the pulse signal output from a charge pump (35), and the line filter (20) configured to be provided on a control voltage supply line (LUHF) for supplying the control voltage from the low-pass filter to a voltage controlled oscillation circuit (17A). Here, one end of a capacitor (C1) of the line filter (20) is connected, through resistance (r) of a CP current switching circuit (36), from an output terminal of the charge pump to the ground in terms of high frequencies.

Description

technical field [0001] The present invention relates to a phase synchronous circuit capable of applying a control voltage to a tuning circuit connected to a voltage-controlled oscillation circuit which generates a local oscillation signal corresponding to the control voltage and an RF filter circuit which switches frequency characteristics by controlling the voltage, and to a television signal receiver circuit. Background technique [0002] In the prior art, there is a television signal receiving circuit that applies a control voltage to an RF filter circuit provided in a receiving system via a tuning line, and sets a frequency characteristic corresponding to a receiving channel to the RF filter circuit (for example, refer to Patent Document 1 and Patent Document 2). In the television signal receiving circuit described above, a local oscillation signal obtained by converting the received RF signal into an intermediate frequency signal by the voltage control oscillation circ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03L7/18H04N5/04H04N5/44H04N5/50
CPCH03J7/065H04N5/126H03L7/093H03J3/08
Inventor 樋田将典
Owner ALPS ALPINE CO LTD