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If amplifier

A technology of tuner and oscillator, applied in the field of tuner

Inactive Publication Date: 2007-04-18
NXP BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Existing tuner, IF amplifier and mixer ICs have the disadvantage that there must be two tuner, IF amplifier and mixer ICs

Method used

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Examples

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Embodiment Construction

[0019] Figure 1 shows a schematic example of a tuner according to the invention. The tuner comprises an input 1 to receive an input signal, eg from an antenna, which input is connected to an input circuit 3 to process the input signal. The input circuit is connected to a mixer oscillator stage 5 to obtain and provide the intermediate frequency signal. The mixer-oscillator stage supplies the intermediate frequency signal (symmetrical asymmetrical) via outputs 01 and 02 to a SAW (Surface Acoustic Wave) filter 7, as such filters are named in the art.

[0020] The working process of the tuner will not be described again, because it is generally known to those skilled in the art.

[0021] In this example, the mixer oscillator stage 5 comprises a mixer oscillator integrated circuit 51 . The mixer oscillator integrated circuit comprises an intermediate frequency amplifier 511, switching means 513 and control means 53 for controlling the switching means. It should be noted here tha...

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Abstract

Until now at least two types of mixer oscillator integrated circuits for tuners have to be developed. One for the symmetrical output mode and one for the asymmetrical output mode. To obtain a tuner, IF amplifier, and / or mixer oscillator integrated circuit that is suitable for both output modes the tuner comprises switching means, whereby in the asymmetrical mode one output of the tuner is coupled to ground.

Description

technical field [0001] The present invention relates to a tuner. [0002] The invention also relates to an intermediate frequency amplifier for use in such a tuner. [0003] The invention also relates to a mixer-oscillator integrated circuit comprising such an intermediate frequency amplifier. Background technique [0004] Such tuner, intermediate frequency amplifier and mixer oscillator integrated circuits are well known in the art and are used in television receivers, radio receivers and other applications. [0005] Existing tuner, IF amplifier and mixer ICs have the disadvantage that two tuner, IF amplifier and mixer ICs must exist. That is, depending on the output of the tuner, symmetrical and asymmetrical. Contents of the invention [0006] It is an object of the present invention to provide a tuner, intermediate frequency amplifier and mixer oscillator integrated circuit which can be used for both symmetrical and asymmetrical outputs. [0007] To achieve this pur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03F3/72H04B1/26H03D7/00H03F3/45H04B1/16H04B1/18
CPCH03F3/45479H03F3/72H03J1/06H03J5/146H03J2200/01H03J2200/36
Inventor M·温克O·克兰德
Owner NXP BV
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