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Local oscillator, reception device and electronic device using the same

A technology of local oscillator and oscillation circuit, applied in power oscillator, adjustment of resonant circuit, electrical components, etc., can solve problems such as phase noise deterioration of local oscillator 10, and achieve the effect of high phase noise and phase noise realization.

Inactive Publication Date: 2011-10-05
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And, in the frequency band with high frequency control sensitivity, due to the control voltage V T The voltage noise superimposed in the f OSC changes, the phase noise degradation of the local oscillator 10

Method used

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  • Local oscillator, reception device and electronic device using the same
  • Local oscillator, reception device and electronic device using the same
  • Local oscillator, reception device and electronic device using the same

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Experimental program
Comparison scheme
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no. 1 approach

[0105] Below, use figure 1 The first embodiment in the present invention will be described. figure 1 is a block diagram of a local oscillator in this embodiment.

[0106] exist figure 1Among them, a local oscillator 1 includes an oscillation circuit 2 and a resonant circuit 3 connected to the oscillation circuit 2 . Furthermore, the oscillation circuit 2 and the resonance circuit 3 are connected in a loop to the PLL circuit 60 . In addition, a receiving device (not shown) using this local oscillator 1 has a mixer (not shown) and a demodulator (not shown) using the local oscillation signal output from the local oscillator 1 The partial signal output from the terminals 18a and 18b converts the reception signal into an intermediate frequency signal, and the demodulator demodulates the intermediate frequency signal output from the mixer. In addition, an electronic device (not shown) using the local oscillator 1 has a signal processing unit (not shown) connected to the outpu...

no. 2 approach

[0161] Below, use Figure 7 A second embodiment of the present invention will be described. In addition, the same code|symbol is attached|subjected to the same structure as 1st Embodiment, the description is abbreviate|omitted, and only a different point is described in detail. Figure 7 It is a diagram showing the first reference voltage generating circuit 6 and the second reference voltage generating circuit 7 in this embodiment.

[0162] Figure 7 The first reference voltage generating circuit 6 and the second reference voltage generating circuit 7 shown differ from the first embodiment in that each of the four sets of voltage generating circuits with different resistance division ratios between VCC-GND is set Diodes 681-684, 781-784 are used in each group. Usually, when configuring a circuit that generates a predetermined voltage in a semiconductor, in order to avoid an unnecessary increase in power consumption and figure 2 In order to increase the circuit scale by th...

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PUM

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Abstract

A broad oscillation frequency range and good phase noise characteristic are achievable simultaneously by an oscillation circuit and a resonance circuit connected to the oscillation circuit. The resonance circuit includes an inductor element connected to the oscillation circuit, a first variable capacitance section connected to the inductor element, and a second variable capacitance section connected in parallel to the first variable capacitance section. The first variable capacitance section includes a first variable capacitive element connected to the inductor element, and a second variable capacitive element connected in parallel to the first variable capacitive element. The first variable capacitive element changes its capacity value based on a control voltage and a first reference voltage. The second variable capacitive element changes its capacity value based on the control voltage and a second reference voltage. The first reference voltage and the second reference voltage are controlled based on the capacity value of the second variable capacitance section.

Description

technical field [0001] The present invention relates to a local oscillator, a receiving device and electronic equipment using the same. Background technique [0002] Below, use Figure 9 A conventional local oscillator disclosed in Patent Document 1 will be described. exist Figure 9 Among them, a conventional local oscillator 10 includes an oscillation circuit 2 and a resonant circuit 30 connected to the oscillation circuit 2 . Furthermore, the oscillation circuit 2 and the resonance circuit 30 are connected in a loop to the PLL circuit 60 . [0003] Furthermore, the resonant circuit 30 has inductance elements 20 a and 20 b connected to the oscillating circuit 2 . The inductance element 20a and the inductance element 20b are connected in series, and the contact point thereof is connected to VCC. Furthermore, the resonant circuit 30 has a first variable capacitance unit 330 connected in parallel to the inductance elements 20 a and 20 b and a second variable capacitance un...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/26H03B5/12
CPCH03L7/10H03B5/1215H03B5/1231H03B2201/0208H03L2207/06H03L7/087H03L7/099H03B5/1265H03B2201/025H03J2200/10H03L7/18
Inventor 藤井健史大场康雄岩井田峰之尾关浩明
Owner PANASONIC CORP