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Semiconductor device and radio circuit device using same

A semiconductor and radio technology used in electrical components, automatic power control, transmission systems, etc.

Inactive Publication Date: 2011-03-30
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] On the other hand, in the structure described in Patent Document 1, the frequency division controlled by the delta-sigma modulator is used in the PLL loop, and PLL circuits dedicated to transmission and reception are still required.

Method used

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  • Semiconductor device and radio circuit device using same
  • Semiconductor device and radio circuit device using same
  • Semiconductor device and radio circuit device using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0101] The configuration of a wireless circuit device according to Embodiment 1 of the present invention will be described with reference to FIG. 1 . The signal received by the antenna 1 passes through the antenna duplexer 2 and only the desired reception frequency band is input to the low noise amplifier 3 . The signal amplified by the low noise amplifier 3 is input to the quadrature demodulator 4 . In the quadrature demodulator 4, quadrature demodulation is performed using the received local signal (frequency f2) supplied from the receiving signal generating circuit 6 and the signal phase-shifted by the 90° phase shifter to obtain The baseband signal I / Q.

[0102] The reception signal generating circuit 6 divides the signal of the frequency f3 supplied from the PLL circuit 7 to generate a reception local signal of the frequency f2, and supplies it to the quadrature demodulator 4 .

[0103] The PLL circuit 7 divides the output signal of the TCXO 8 to generate a signal of th...

Embodiment approach 2

[0135] FIG. 12 shows the configuration of a radio circuit device according to Embodiment 2 of the present invention. This wireless circuit device includes a frequency detection unit 60 , a first frequency division ratio correction unit 61 , and a second frequency division ratio correction unit 62 in addition to the configuration of the wireless circuit device of Embodiment 1.

[0136]The frequency detection part 60 detects the output frequency f3 of the PLL circuit 7, controls the first frequency division ratio correction part 61 and the second frequency division ratio correction part 62 according to the detected frequency, after changing from the value of the frequency division ratio X1 and X2, Input to delta-sigma modulator 16. Accordingly, even when the output frequency f3 of the PLL circuit 7 changes, the same effect as that of the wireless circuit device according to Embodiment 1 can be obtained. This effect is effective in a case where the voltage controlled oscillator ...

Embodiment approach 3

[0138] FIG. 13 shows the configuration of a radio circuit device according to Embodiment 3 of the present invention. This wireless circuit device includes a fixed frequency divider 63 in addition to the configuration of the wireless circuit device according to the first embodiment. The fixed frequency divider 63 is inserted between the frequency divider 15 and the BPF 17 in the transmission signal generation circuit 9 and the reception signal generation circuit 6 .

[0139] The fixed frequency divider 63 divides the input frequency according to the fixed frequency division ratio. Therefore, in order to obtain the transmission local signal (f1) and the reception local signal (f12) of the same frequency as in Embodiment 1, the frequency of the PLL output signal (f3) is only increased by the frequency division of the fixed frequency divider 63, or the frequency divider The frequency division ratio of 15 only reduces the frequency division ratio of the fixed frequency divider 63 ...

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Abstract

The semiconductor device of the invention is provided with a signal source (7) outputting the signal of the prearranged frequency, a frequency divider (15) inputting the output signal of the signal source and switching the output signal into more than two frequency dividing ratio of the frequency divider, a delta-sigma modulator (16) controlling the frequency dividing ratio of the frequency divider and a band pass filter (17) inputting the output of the frequency divider. According to the frequency dividing ratio controlled by the delta-sigma modulator, the input signal of the frequency divider has frequency dividing, and the quantification noise produced by the delta-sigma modulator in the input of the frequency divider is reduced through the band pass filter.

Description

technical field [0001] The present invention relates to a semiconductor device capable of generating a signal of a predetermined frequency from an output signal of a signal source with a simple structure, and a wireless circuit device using the semiconductor device. Background technique [0002] FIG. 14 shows a simplified configuration example of a conventional radio circuit device. The signal received by the antenna 1 is input to the low noise amplifier 3 only in the desired reception frequency band via the antenna duplexer 2 . The signal amplified by the low noise amplifier 3 is input to the quadrature demodulator 4 . In the quadrature demodulator 4, the local signal (frequency f2) supplied from the reception PLL circuit 100b and the signal phase-shifted by the 90° phase shifter 5 are used for quadrature demodulation to obtain the baseband signal from which the carrier component has been removed. Signal I / Q. [0003] The receiving PLL circuit 100b is composed of a volta...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03L7/197H03L7/183
CPCH04B1/30H03L7/183
Inventor 前田昌克
Owner PANASONIC CORP