JP2020136824A - 分数分周器および周波数シンセサイザ - Google Patents
分数分周器および周波数シンセサイザ Download PDFInfo
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K5/00—Manipulating of pulses not covered by one of the other main groups of this subclass
- H03K5/00006—Changing the frequency
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
- H03K3/02—Generators characterised by the type of circuit or by the means used for producing pulses
- H03K3/027—Generators characterised by the type of circuit or by the means used for producing pulses by the use of logic circuits, with internal or external positive feedback
- H03K3/037—Bistable circuits
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION, OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L7/00—Automatic control of frequency or phase; Synchronisation
- H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
- H03L7/08—Details of the phase-locked loop
- H03L7/085—Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal
- H03L7/093—Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal using special filtering or amplification characteristics in the loop
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION, OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L7/00—Automatic control of frequency or phase; Synchronisation
- H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
- H03L7/08—Details of the phase-locked loop
- H03L7/099—Details of the phase-locked loop concerning mainly the controlled oscillator of the loop
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION, OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L7/00—Automatic control of frequency or phase; Synchronisation
- H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
- H03L7/16—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop
- H03L7/18—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using a frequency divider or counter in the loop
- H03L7/197—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using a frequency divider or counter in the loop a time difference being used for locking the loop, the counter counting between numbers which are variable in time or the frequency divider dividing by a factor variable in time, e.g. for obtaining fractional frequency division
- H03L7/1974—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using a frequency divider or counter in the loop a time difference being used for locking the loop, the counter counting between numbers which are variable in time or the frequency divider dividing by a factor variable in time, e.g. for obtaining fractional frequency division for fractional frequency division
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION, OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L7/00—Automatic control of frequency or phase; Synchronisation
- H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
- H03L7/16—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop
- H03L7/18—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using a frequency divider or counter in the loop
- H03L7/197—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using a frequency divider or counter in the loop a time difference being used for locking the loop, the counter counting between numbers which are variable in time or the frequency divider dividing by a factor variable in time, e.g. for obtaining fractional frequency division
- H03L7/1974—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using a frequency divider or counter in the loop a time difference being used for locking the loop, the counter counting between numbers which are variable in time or the frequency divider dividing by a factor variable in time, e.g. for obtaining fractional frequency division for fractional frequency division
- H03L7/1976—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using a frequency divider or counter in the loop a time difference being used for locking the loop, the counter counting between numbers which are variable in time or the frequency divider dividing by a factor variable in time, e.g. for obtaining fractional frequency division for fractional frequency division using a phase accumulator for controlling the counter or frequency divider
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/06—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider
- H02M3/07—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider using capacitors charged and discharged alternately by semiconductor devices with control electrode, e.g. charge pumps
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K23/00—Pulse counters comprising counting chains; Frequency dividers comprising counting chains
- H03K23/64—Pulse counters comprising counting chains; Frequency dividers comprising counting chains with a base or radix other than a power of two
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION, OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L2207/00—Indexing scheme relating to automatic control of frequency or phase and to synchronisation
- H03L2207/50—All digital phase-locked loop
Abstract
Description
T(N)=DIV_con(N-1)×Tck+SEL_con(N-1)×Tck/16−SEL_con(N-2)×Tck/16
…(式1)
ここで、位相アキュミュレータ166での演算は以下のように表される。
DSM_FF(N-1)+0.SEL_conA(N-2)=DIV_con(N-1).SEL_conA(N-1)
これを10進数で表すと、
DSM_FF(N-1)+SEL_conA(N-2)/16=DIV_con(N-1)+SEL_conA(N-1)/16
…(式2)
式1および式2から、
T(N)/Tck=DIV_con(N-1)+SEL_con(N-1)/16−SEL_con(N-2)/16
=DIV_con(N-1)+SEL_conA(N-1)/16−SEL_conA(N-2)/16
=DSM_FF(N-1)+SEL_conA(N-2)/16−SEL_conA(N-2)/16
=DSM_FF(N-1)
となる。すなわち、分数分周信号S150の周期は、1周期前のラッチ信号DSM_FFで指定された周期となる。他の実施の形態では、位相アキュミュレータ166および第1フリップフロップ170に代えて、ラッチ信号DSM_FFと分数分周信号S150の周期との上記の関係を実現する任意の回路構成が採用されてもよい。さらに他の実施の形態では、ラッチ信号DSM_FFで指定された周期が分数分周信号S150に反映されるまでの遅延量を、2周期以上に設定してもよい。
Claims (10)
- 入力信号を整数の分周比で分周した整数分周信号を用いて、該入力信号を分数の分周比で分周した分数分周信号を生成する分数分周回路と、
指定された分数の分周比を表す周波数制御信号を、前記分数分周信号に同期して取り込むラッチ回路と、
取り込まれた周波数制御信号に基づいて、指定された分数の分周比に対応する整数の分周比を設定するための整数制御信号を、整数分周信号に同期して生成する制御回路と、を備え、
前記分数分周回路は、入力信号に同期して整数制御信号を参照することにより、整数の分周比を更新するよう構成される分数分周器。 - 前記制御回路は、整数制御信号を、整数分周信号に同期して遅延させるよう構成される請求項1に記載の分数分周器。
- 前記制御回路は、前記ラッチ回路が周波数制御信号を取り込んでから、分数分周信号の周期で少なくとも1周期遅れて、指定された分数の分周比が分数分周信号に反映されるよう構成される請求項2に記載の分数分周器。
- 前記分数分周回路は、
入力信号を整数の分周比で分周することにより整数分周信号を生成する整数分周回路と、
生成された整数分周信号の周波数と同じ周波数の多相信号を生成する多相生成回路と、
生成された多相信号に基づいて分数分周信号を生成する選択回路と、を含み、
前記制御回路は、取り込まれた周波数制御信号に基づいて、多相信号のうち指定された分数の分周比に対応する位相の信号を選択するための選択制御信号を生成し、
前記選択回路は、多相信号のなかから選択制御信号に基づいて信号を選択することによって、分数分周信号を生成する請求項1から3のいずれか一項に記載の分数分周器。 - 入力信号は多相クロック信号のなかのひとつのクロック信号であり、
前記多相生成回路は、整数分周信号と多相クロック信号とに基づいて多相信号を生成する請求項4に記載の分数分周器。 - 前記制御回路は、選択制御信号を、整数分周信号に同期して遅延させるよう構成される請求項4または5に記載の分数分周器。
- 前記制御回路は、整数分周信号をクロックとするフリップフロップによって選択制御信号を遅延させる請求項6に記載の分数分周器。
- 前記整数分周回路はマルチモデュラス型の分周器である請求項4から7のいずれか一項に記載の分数分周器。
- 分数の分周比を指定するための周波数制御ワードを周波数制御信号に変換するデルタシグマ変調器をさらに備える請求項1から8のいずれか一項に記載の分数分周器。
- 請求項1から9のいずれか一項に記載の分数分周器と、
参照信号の位相と分数分周信号の位相とを比較する比較回路と、
前記比較回路における比較結果に応じた電流を生成するチャージポンプと、
前記チャージポンプによって生成された電流による充放電により出力信号の電圧が制御されるループフィルタと、
前記ループフィルタの出力信号の電圧に応じた周波数の入力信号を生成する電圧制御発振器と、を備える周波数シンセサイザ。
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JP2019025789A JP7324013B2 (ja) | 2019-02-15 | 2019-02-15 | 分数分周器および周波数シンセサイザ |
US16/775,675 US10784844B2 (en) | 2019-02-15 | 2020-01-29 | Fractional frequency divider and frequency synthesizer |
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EP4203313A4 (en) * | 2020-11-16 | 2024-03-20 | Changxin Memory Tech Inc | GENERATION CIRCUIT AND METHOD FOR GENERATION OF PULSE SIGNAL AND MEMORY |
US11095293B1 (en) * | 2020-12-31 | 2021-08-17 | Texas Instruments Incorporated | Low-power fractional analog PLL without feedback divider |
KR20230079723A (ko) * | 2021-11-29 | 2023-06-07 | 삼성전자주식회사 | 위상 쉬프터를 포함하는 분수 분주기 및 이를 포함하는 분수 분주형 위상 고정 루프 |
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JPS54143056A (en) * | 1978-04-28 | 1979-11-07 | Toshiba Corp | Variable frequency divider circuit |
JPS62206925A (ja) * | 1986-03-05 | 1987-09-11 | Mitsubishi Electric Corp | 周波数シンセサイザ |
JPH08265148A (ja) * | 1995-03-22 | 1996-10-11 | Nippon Motorola Ltd | 周波数シンセサイザ |
US20020163389A1 (en) * | 2001-03-23 | 2002-11-07 | Samsung Electronics Co., Ltd. | Phase locked loop circuit for a fractional-N frequency synthesizer |
CN104601171A (zh) * | 2013-10-31 | 2015-05-06 | 上海凌阳科技有限公司 | 小数分频器和小数分频锁相环 |
US20160156364A1 (en) * | 2014-12-02 | 2016-06-02 | Mediatek Inc. | Fractional Dividing Module and Related Calibration Method |
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WO2015172372A1 (en) * | 2014-05-16 | 2015-11-19 | Lattice Semiconductor Corporation | Fractional-n phase locked loop circuit |
TWI551054B (zh) | 2014-09-23 | 2016-09-21 | 智原科技股份有限公司 | 時脈產生裝置與其小數除頻器 |
US10396808B2 (en) * | 2016-03-15 | 2019-08-27 | Board Of Regents, The University Of Texas System | Fractional-N phase lock loop apparatus and method using multi-element fractional dividers |
US10116315B1 (en) * | 2017-09-21 | 2018-10-30 | Qualcomm Incorporated | System-on-a-chip clock phase management using fractional-N PLLs |
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- 2020-01-29 US US16/775,675 patent/US10784844B2/en active Active
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS54143056A (en) * | 1978-04-28 | 1979-11-07 | Toshiba Corp | Variable frequency divider circuit |
JPS62206925A (ja) * | 1986-03-05 | 1987-09-11 | Mitsubishi Electric Corp | 周波数シンセサイザ |
JPH08265148A (ja) * | 1995-03-22 | 1996-10-11 | Nippon Motorola Ltd | 周波数シンセサイザ |
US20020163389A1 (en) * | 2001-03-23 | 2002-11-07 | Samsung Electronics Co., Ltd. | Phase locked loop circuit for a fractional-N frequency synthesizer |
CN104601171A (zh) * | 2013-10-31 | 2015-05-06 | 上海凌阳科技有限公司 | 小数分频器和小数分频锁相环 |
US20160156364A1 (en) * | 2014-12-02 | 2016-06-02 | Mediatek Inc. | Fractional Dividing Module and Related Calibration Method |
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