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Voltage controlled oscillator, and pll circuit and wireless communication device using voltage controlled oscillator

A technology of voltage-controlled oscillators and circuits, applied in power oscillators, electrical components, automatic power control, etc., can solve the problem of narrowing the frequency variable range and achieve the effect of suppressing the deterioration of phase noise characteristics

Inactive Publication Date: 2013-10-30
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, a voltage-controlled oscillator using all variable capacitance elements has a problem that the frequency variable range becomes narrower than a voltage-controlled oscillator including a capacitance switching circuit.

Method used

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  • Voltage controlled oscillator, and pll circuit and wireless communication device using voltage controlled oscillator
  • Voltage controlled oscillator, and pll circuit and wireless communication device using voltage controlled oscillator
  • Voltage controlled oscillator, and pll circuit and wireless communication device using voltage controlled oscillator

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0061] figure 1 It is a diagram showing a configuration example of the voltage-controlled oscillator 101 according to the first embodiment of the present invention. Wherein, the bias circuit (Biasing circuit) and the like are omitted. exist figure 1 Among them, the voltage controlled oscillator 101 of the first embodiment includes: an inductance circuit 110, a first variable capacitance circuit 120, a second variable capacitance circuit 130, a first capacitance switch circuit 140, a second capacitance switch circuit 150, a negative resistor A circuit 160 , a current source 170 , and a frequency sensitivity control unit 180 . The inductance circuit 110 , the first variable capacitance circuit 120 , the second variable capacitance circuit 130 , the first capacitance switching circuit 140 , the second capacitance switching circuit 150 and the negative resistance circuit 160 are connected in parallel to form an oscillation circuit.

[0062] Inductor circuit 110 is composed of...

no. 2 approach

[0073] Figure 5 It is a diagram showing a configuration example of the voltage-controlled oscillator 102 according to the second embodiment of the present invention. Wherein, the bias circuit and the like are omitted. exist Figure 5 Among them, the voltage-controlled oscillator 102 of the second embodiment is configured by adding the third variable capacitance circuit 135 to the voltage-controlled oscillator 101 of the above-mentioned first embodiment.

[0074] The third variable capacitance circuit 135 is composed of variable capacitance elements 136 and 137 connected in series, and the control potential Vt or control signal Fsel1 is applied between the variable capacitance element 136 and the variable capacitance element 137 via the frequency sensitivity control unit 180 connection point C. In the second embodiment, the frequency sensitivity control unit 180 applies the control potential Vt or the control signal Fsel1 to the connection point C of the third variable capa...

no. 3 approach

[0077] here, figure 1 and Figure 5 The shown configuration of voltage controlled oscillators 101 and 102 is merely an example. The voltage-controlled oscillator of the present invention only needs to include two or more variable capacitor circuits and at least one capacitor switch circuit. For example, if the Figure 8A ~ Figure 8C With the structure shown, the following control can also be realized.

[0078] When using a single VCO to output signals of different frequencies (high band, low band), usually the high band signal output from the VCO is converted to a low frequency by a 1 / n divider with signal. At this time, it is preferable to make the frequency sensitivity of the low-band signal output from the 1 / n frequency divider coincide with the frequency sensitivity of the high-band signal output from the voltage-controlled oscillator. For this reason, it is necessary to make the frequency sensitivity of the low-band signal n times that of the high-band signal when it...

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PUM

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Abstract

A voltage controlled oscillator includes first and second variable capacitance circuits 120 and 130, and first and second capacitance switch circuits 140 and 150. A control voltage Vt is fixedly applied to the first variable capacitance circuit 120, and control signals Fsel2 and Fsel3 are fixedly applied to the first and second capacitance switch circuits 140 and 150, respectively. When both of the control signals Fsel2 and Fsel3 are at a low level, the control signal Fsel1 is applied to the second variable capacitance circuit 130. When the control signals Fsel2 and Fsel3 are both not at the low level, the control voltage Vt is applied to the second variable capacitance circuit 130. As a result of this control, a high-frequency variable range is divided into two variable ranges, one based on upper frequencies and the other based on lower frequencies. This enables suppression of a frequency sensitivity without narrowing the high-frequency variable range.

Description

technical field [0001] The present invention relates to a voltage-controlled oscillator used for generation of local oscillator signals (Local oscillator signals) of a wireless communication device, a phase-locked loop (hereinafter referred to as PLL) circuit using the same, and a wireless communication device. Background technique [0002] Voltage controlled oscillators are widely used as a means of generating local oscillator signals for wireless communication devices. When this voltage-controlled oscillator is manufactured as a high-frequency IC, it is necessary to widen the range of the oscillation frequency in order to eliminate variations in constituent elements that occur in the semiconductor manufacturing process. In addition, in recent years, in order to cope with communication systems using different frequency bands, it is necessary to be able to adjust the oscillation frequency of the voltage-controlled oscillator over a wide frequency range. [0003] Figure 13 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03B5/08H03B5/12
CPCH03B1/00H03B2200/005H03B2200/0048H03B5/1228H03B5/1215H03B5/1243H03B5/1265H03B5/1253H03B5/1293H03L7/099H03L7/18H03L2207/06
Inventor 築泽贵行
Owner PANASONIC CORP