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Local oscillation signal level adjustment circuit, local oscillation signal level adjustment method, and wireless communication device

A technology of local oscillation and signal level, applied in demodulation, electrical components, modulation transfer, etc., can solve the problem of conversion gain drop of frequency conversion circuit

Inactive Publication Date: 2016-12-14
PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for example, when the level of the local oscillator signal drops due to temperature changes, the conversion gain of the inverter circuit may drop

Method used

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  • Local oscillation signal level adjustment circuit, local oscillation signal level adjustment method, and wireless communication device
  • Local oscillation signal level adjustment circuit, local oscillation signal level adjustment method, and wireless communication device
  • Local oscillation signal level adjustment circuit, local oscillation signal level adjustment method, and wireless communication device

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Embodiment approach 1

[0023] figure 1 It is a block diagram showing a configuration example of the radio communication device 1 according to Embodiment 1 of the present invention. Below, refer to figure 1 The configuration of the wireless communication device 1 will be described. figure 1 The wireless communication device 1 shown in FIG. 1 illustrates the structure of a wireless receiving unit, but the present invention is not limited thereto, and may also include a structure of a wireless transmitting unit.

[0024] exist figure 1 Among them, a wireless communication device 1 includes an antenna 2 , a low noise amplifier (hereinafter referred to as LNA: Low Noise Amplifier) ​​10 , a local oscillator signal level adjustment circuit 20 , and a baseband signal processing circuit 17 .

[0025] Local oscillation signal level adjustment circuit 20 includes: frequency conversion circuit 11, local oscillation circuit 12, variable gain amplifier 13, control circuit 14, A / D converter (ADC) 15, D / A conver...

Embodiment approach 2

[0039] image 3 It is a block diagram showing a configuration example of a wireless communication device 1A according to Embodiment 2. In order to improve the reception sensitivity of the wireless communication device 1 according to Embodiment 1, the wireless communication device 1A is configured in consideration of increasing the overall gain of the receiving circuit. and figure 1 Compared with the wireless communication device 1 of Embodiment 1, the local oscillation signal level adjustment circuit 20A of the wireless communication device 1A includes a baseband amplifier 18 between the frequency conversion circuit 11 and the A / D converter 15 .

[0040] The baseband amplifier 18 amplifies the analog baseband signal, and outputs the amplified analog baseband signal to the A / D converter 15 . The control circuit 14 increases the gain of the variable gain amplifier 13 until the output code of the digital baseband signal from the A / D converter 15 is saturated (until the DC bias ...

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Abstract

A local oscillation signal level adjustment circuit includes: a local oscillation circuit that outputs a local oscillation signal; a variable gain amplifier that amplifies the local oscillation signal level; a frequency conversion circuit that converts a radio signal into an analog baseband signal by using the local oscillation signal thus amplified; an A / D converter that converts the analog baseband signal into an output code of a digital baseband signal; and a control circuit that controls a gain of the variable gain amplifier on a basis of the output code of the digital baseband signal, wherein the control circuit increases the gain of the variable gain amplifier until the output code of the digital baseband signal becomes saturated.

Description

technical field [0001] The present invention relates to a local oscillation signal level adjustment circuit and a local oscillation signal level adjustment method used in a wireless communication device, and a wireless communication device. Background technique [0002] Currently popular wireless communication devices use a frequency conversion circuit to down-convert a received radio frequency signal to a baseband frequency band, and then perform demodulation signal processing. In the conventional frequency conversion, the output signal (local oscillation signal) of the local oscillation circuit is injected into the frequency conversion circuit. However, for example, when the level of the local oscillation signal decreases due to temperature change, the conversion gain of the frequency conversion circuit may decrease. [0003] Various methods have been proposed as methods for suppressing fluctuations in conversion gain. For example, a circuit that detects the level of a l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03D7/00H04B1/40
CPCH03D7/00H04B1/40H03L1/00H04B1/30
Inventor 佐藤多俊金丸正树
Owner PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD