WO1999056386A1 - Oscillateur - Google Patents
Oscillateur Download PDFInfo
- Publication number
- WO1999056386A1 WO1999056386A1 PCT/JP1999/002206 JP9902206W WO9956386A1 WO 1999056386 A1 WO1999056386 A1 WO 1999056386A1 JP 9902206 W JP9902206 W JP 9902206W WO 9956386 A1 WO9956386 A1 WO 9956386A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- type transistor
- gate
- type
- transistor
- amplifier
- Prior art date
Links
- 230000010355 oscillation Effects 0.000 claims abstract description 56
- 238000000034 method Methods 0.000 claims abstract description 12
- 238000009792 diffusion process Methods 0.000 claims description 33
- 239000010453 quartz Substances 0.000 abstract 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract 1
- 239000013078 crystal Substances 0.000 description 8
- 230000005684 electric field Effects 0.000 description 6
- 239000000758 substrate Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
- H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
- H03B5/30—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element being electromechanical resonator
- H03B5/32—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element being electromechanical resonator being a piezoelectric resonator
- H03B5/36—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element being electromechanical resonator being a piezoelectric resonator active element in amplifier being semiconductor device
- H03B5/366—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element being electromechanical resonator being a piezoelectric resonator active element in amplifier being semiconductor device and comprising means for varying the frequency by a variable voltage or current
- H03B5/368—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element being electromechanical resonator being a piezoelectric resonator active element in amplifier being semiconductor device and comprising means for varying the frequency by a variable voltage or current the means being voltage variable capacitance diodes
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
- H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
- H03B5/30—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element being electromechanical resonator
- H03B5/32—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element being electromechanical resonator being a piezoelectric resonator
- H03B5/36—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element being electromechanical resonator being a piezoelectric resonator active element in amplifier being semiconductor device
- H03B5/364—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element being electromechanical resonator being a piezoelectric resonator active element in amplifier being semiconductor device the amplifier comprising field effect transistors
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
- H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
- H03B5/30—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element being electromechanical resonator
- H03B5/32—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element being electromechanical resonator being a piezoelectric resonator
- H03B5/36—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element being electromechanical resonator being a piezoelectric resonator active element in amplifier being semiconductor device
- H03B5/366—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element being electromechanical resonator being a piezoelectric resonator active element in amplifier being semiconductor device and comprising means for varying the frequency by a variable voltage or current
Definitions
- the present invention relates to an oscillation device used for a mobile phone or the like.
- this type of oscillator has a configuration including an oscillator element and a first amplifier connected between the input and output terminals of the oscillator element.
- the first amplifier has a configuration including a first P-type transistor and a first N-type transistor formed by a MOS process in order to reduce the size and reduce the cost. That is, the gate of the first P-type transistor and the gate of the first N-type transistor are connected to the output terminal of the oscillation element, and the drain of the first P-type transistor and the drain of the first N-type transistor are connected.
- the input terminal of the oscillation element was connected, the source of the first P-type transistor was connected to a power supply terminal, and the source of the first N-type transistor was connected to a ground terminal.
- the gate of the first P-type transistor is configured to be bridged between the P-type source diffusion region and the P-type drain diffusion region, and the gate of the first N-type transistor has the N-type source.
- the structure was bridged between the diffusion region and the N-type drain diffusion region.
- the output from the oscillation element is applied to the gates of the first P-type transistor and the first N-type transistor, and the output of the oscillation element is applied to these gates.
- this gate applies electric power to the portion between the source diffusion region and the drain diffusion region that are bridged.
- the gate forms a conduction channel in the bridged source diffusion region and drain diffusion region, thereby forming the first P-type transistor.
- the oscillation output is fed back to the input terminal of the oscillation element by alternately conducting the and the first N-type transistor, whereby the oscillation is continued.
- the first amplifier is composed of the first P-type transistor and the first N-type transistor formed by the MOS process, a small and inexpensive device will be constructed.
- MOS process when such a MOS process is used, there is a problem that many frequency components shifted from the desired oscillation frequency are generated before and after the desired oscillation frequency.
- an object of the present invention is to reduce noise levels other than a desired oscillation frequency.
- the present invention is such that the bridge length of the gut of the first N-type transistor is longer than the bridge length of the gate of the first P-type transistor.
- an N-type transistor when comparing an N-type transistor and a P-type transistor, an N-type transistor Since the bridge length of the gate of the N-type transistor is shorter than the bridge length of the gate of the P-type transistor, a large electric field is intensively generated at the gate, drain and source of the N-type transistor.
- the electric field intensity can be reduced by making the bridge length of the gate of the N-type transistor longer than the bridge length of the gate of the P transistor, so that noise levels other than the oscillation frequency are suppressed. You can do it.
- FIG. 1 is a circuit diagram of one embodiment of the present invention
- FIG. 2 is a circuit diagram showing a configuration of the amplifier
- FIG. 3 is a perspective view showing the specific configuration
- FIG. FIG. 4 is a characteristic diagram of phase noise in the oscillation device.
- An oscillating device includes an oscillating element and a first amplifier connected between input and output terminals of the oscillating element, wherein the first amplifier is formed by a first P-S A gate of a first P-type transistor and a gate of a first N-type transistor are connected to an output terminal of the oscillation element; A drain of the P-type transistor and a drain of the first N-type transistor are connected to an input terminal of the oscillation element, a source of the first P-type transistor is connected to a power supply terminal, and a source of the first N-type transistor is connected.
- the gate of the first P-type transistor is bridged between the P-type source diffusion region and the P-type drain diffusion region, and the gate of the first N-type transistor is Source diffusion region and N-type drain Bridge between the diffusion areas
- the bridge length of the gate of the first N-type transistor is longer than the bridge length of the gate of the first P-type transistor, and the bridge length of the gate of the first N-type transistor is The noise level other than the oscillation frequency of the oscillation output is suppressed by making it longer than the bridge length of the first P-type transistor.
- the input terminal of the second amplifier is connected to the output terminal of the first amplifier, and the second amplifier has a second P-type transistor and a second N-type transistor formed by an MS process. Connecting the gate of the second P-type transistor and the gate of the second N-type transistor to the connection between the drains of the first P-type transistor and the first N-type transistor; The drain of the second P-type transistor and the drain of the second N-type transistor are connected to the oscillation output terminal, the source of the second P-type transistor is connected to the power supply terminal, and the source of the second N-type transistor is connected.
- the gut of the second P-type transistor is bridged between the P-type source diffusion region and the P-type drain diffusion region, and the gate of the second N-type transistor is N Source diffusion region and N A bridge between the drain diffusion regions, wherein the bridge length of the gate of the second N-type transistor is longer than the bridge length of the gate of the second P-type transistor;
- the second amplifier interposed between the first amplifier and the oscillation output terminal is connected to the same noise level as the first amplifier.
- the bridge length of the gate of the second N-type transistor is longer than the bridge length of the gate of the first N-type transistor.
- the second amplifier is set to the second amplifier so that this noise level is not amplified again by the second amplifier.
- reference numeral 1 denotes a crystal oscillation element used as an oscillation element, an output terminal 2 of which is connected to an input terminal of a first amplifier 3, and an output terminal of the first amplifier 3 Connected to input terminal 4 of The output terminal of the first amplifier 3 is connected to the input terminal of the second amplifier 5, and the output terminal of the second amplifier 5 is connected to the oscillation output terminal 6.
- a capacitor 7 and a varicap diode 8 are connected in series to the output terminal 2 of the crystal oscillation element 1, and a voltage control terminal 9 is connected to a cathode of the varicap diode 8.
- a capacitor 10 is connected to the input terminal 4 of the crystal oscillator 1.
- the capacitance of the varicap diode 8 changes accordingly, and the oscillation frequency of the crystal oscillation element 1 can be changed. Also, the oscillation output of the crystal oscillation element 1 is fed back by the first amplifier 3, whereby the oscillation is continued. The oscillation output is led to the oscillation output terminal 6 via the second amplifier 5, and the output from the oscillation output terminal 6 is supplied to the PLL circuit in a mobile phone or the like. is there.
- the amplifier 3 has a first P-type transistor 11 and a first N-type transistor 12 formed by a MOS process.
- the gate of the P-type transistor 11 and the gate of the first N-type transistor 12 are connected to the output terminal 2 of the crystal oscillator 1, and the drain of the first P-type transistor 11
- the drains of the N-type transistors 12 are connected to the input terminal 4 of the crystal oscillator 1.
- the source of the first P-type transistor 11 is connected to a power terminal 13, and the source of the first N-type transistor 12 is connected to a ground terminal 14.
- the second amplifier 5 has a second P-type transistor 15 and a second N-type transistor 16 formed by an MS process, and has a gate of the second P-type transistor 15.
- gut of the second N-type transistor 16 are connected to the connection between the drains of the first P-type transistor 11 and the first N-type transistor 12, and the second P-type transistor
- the drain of the transistor 15 and the drain of the second N-type transistor 16 are connected to the oscillation output terminal 6. Further, the source of the second P-type transistor 15 is connected to the power supply terminal 13, and the source of the second N-type transistor 16 is connected to the ground terminal 14.
- FIG. 3 shows a specific configuration of the first P-type transistor 11 and the first N-type transistor 12.
- reference numeral 17 denotes a P-type substrate made of silicon, on which a first P-type transistor 11 and a first N-type transistor 12 are formed.
- the gate 20 is bridged between the N-type source diffusion region 18 and the N-type drain diffusion region 19.
- the gate 23 is bridged between the P-type drain diffusion region 21 and the P-type source diffusion region 22.
- an N-type substrate diffusion region 24 is provided below the gate of the first P-type transistor 11.
- Fig. 3 is formed by a conventional MOS process. It has a configuration of an amplifier.
- the bridge length Ln of the gate 20 of the first N-type transistor 12 is made longer than the bridge length Lp of the gate 23 of the first P-type transistor 11. It has features.
- the desired oscillation frequency is higher than that of the conventional line B as shown by the line A in FIG.
- the noise level of the shifted frequency can be greatly suppressed.
- the bridge length Ln of the gate 20 is set to 6.0 ⁇ m
- the bridge length Lp of the gate 23 is set to 2.5 ⁇ .
- the solid line shows the state when L ⁇ is 2.0 / x ni and L ⁇ is 2.5 ⁇ m.
- the second P-type transistor 15 and the second N-type transistor 16 shown in FIG. 2 form the gate bridge length of the second N-type transistor 16 as shown in FIG.
- the bridge length of the second P-type transistor 15 is longer than the bridge length of the gut
- the bridge length of the gate of the second N-type transistor 16 is equal to the gate length of the first N-type transistor 12. It is longer than the bridge length of 20. That is, the second amplifier 5 stabilizes the oscillation output from the oscillation output terminal 6 by suppressing the noise level further than the first amplifier 3.
- Equation 2 V ⁇ X-I
- V n Input conversion noise
- the present invention reduces the bridge length of the gate of the first N-type transistor. By making the gate length of the first P-type transistor longer than the bridge length, noise levels other than the oscillation frequency of the oscillation output can be suppressed.
Landscapes
- Oscillators With Electromechanical Resonators (AREA)
- Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/446,781 US6556091B1 (en) | 1998-04-27 | 1999-04-26 | Low noise oscillator having dissimilar MOS gate structures |
EP99919523A EP0998023A4 (en) | 1998-04-27 | 1999-04-26 | OSCILLATOR |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10/116755 | 1998-04-27 | ||
JP11675598A JP3204211B2 (ja) | 1998-04-27 | 1998-04-27 | 発振装置 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1999056386A1 true WO1999056386A1 (fr) | 1999-11-04 |
Family
ID=14694948
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP1999/002206 WO1999056386A1 (fr) | 1998-04-27 | 1999-04-26 | Oscillateur |
Country Status (4)
Country | Link |
---|---|
US (1) | US6556091B1 (ja) |
EP (1) | EP0998023A4 (ja) |
JP (1) | JP3204211B2 (ja) |
WO (1) | WO1999056386A1 (ja) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4975053A (ja) * | 1972-11-21 | 1974-07-19 | ||
JPS5149658A (ja) * | 1974-10-25 | 1976-04-30 | Seiko Instr & Electronics | Denshidokei |
JPS53149754A (en) * | 1978-04-11 | 1978-12-27 | Citizen Watch Co Ltd | Electronic watch |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3676801A (en) * | 1970-10-28 | 1972-07-11 | Motorola Inc | Stabilized complementary micro-power square wave oscillator |
JPS4941055A (ja) * | 1972-08-28 | 1974-04-17 | ||
GB1551871A (en) * | 1976-01-14 | 1979-09-05 | Citizen Watch Co Ltd | Crystal oscillator controlled electronic timepiece |
JPS5951610A (ja) * | 1983-08-22 | 1984-03-26 | Hitachi Ltd | 電子回路 |
US5113156A (en) * | 1991-04-22 | 1992-05-12 | Motorola, Inc. | Low power crystal oscillator with automatic gain control |
US5973363A (en) * | 1993-07-12 | 1999-10-26 | Peregrine Semiconductor Corp. | CMOS circuitry with shortened P-channel length on ultrathin silicon on insulator |
-
1998
- 1998-04-27 JP JP11675598A patent/JP3204211B2/ja not_active Expired - Lifetime
-
1999
- 1999-04-26 WO PCT/JP1999/002206 patent/WO1999056386A1/ja not_active Application Discontinuation
- 1999-04-26 US US09/446,781 patent/US6556091B1/en not_active Expired - Lifetime
- 1999-04-26 EP EP99919523A patent/EP0998023A4/en not_active Withdrawn
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4975053A (ja) * | 1972-11-21 | 1974-07-19 | ||
JPS5149658A (ja) * | 1974-10-25 | 1976-04-30 | Seiko Instr & Electronics | Denshidokei |
JPS53149754A (en) * | 1978-04-11 | 1978-12-27 | Citizen Watch Co Ltd | Electronic watch |
Also Published As
Publication number | Publication date |
---|---|
EP0998023A1 (en) | 2000-05-03 |
JP3204211B2 (ja) | 2001-09-04 |
US6556091B1 (en) | 2003-04-29 |
EP0998023A4 (en) | 2004-12-15 |
JPH11312926A (ja) | 1999-11-09 |
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