KR20070025137A - Multi-frequency oscillator - Google Patents

Multi-frequency oscillator Download PDF

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KR20070025137A
KR20070025137A KR1020050080939A KR20050080939A KR20070025137A KR 20070025137 A KR20070025137 A KR 20070025137A KR 1020050080939 A KR1020050080939 A KR 1020050080939A KR 20050080939 A KR20050080939 A KR 20050080939A KR 20070025137 A KR20070025137 A KR 20070025137A
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South Korea
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frequency
oscillation
circuit
frequency oscillator
selection signal
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KR1020050080939A
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Korean (ko)
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KR101072991B1 (en
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임대호
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매그나칩 반도체 유한회사
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    • 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
    • H03B5/20—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising resistance and either capacitance or inductance, e.g. phase-shift oscillator
    • 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
    • H03B25/00—Simultaneous generation by a free-running oscillator of oscillations having different frequencies
    • 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
    • H03B5/08—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance
    • H03B5/12—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device
    • H03B5/1237—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device comprising means for varying the frequency of the generator
    • H03B5/124—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device comprising means for varying the frequency of the generator the means comprising a voltage dependent capacitance
    • H03B5/1243—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device comprising means for varying the frequency of the generator the means comprising a voltage dependent capacitance the means comprising 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
    • H03B2201/00—Aspects of oscillators relating to varying the frequency of the oscillations
    • H03B2201/02—Varying the frequency of the oscillations by electronic means
    • H03B2201/0208—Varying the frequency of the oscillations by electronic means the means being an element with a variable capacitance, e.g. capacitance diode

Abstract

A multi-frequency oscillator is provided to reduce an integrated circuit and to obtain an accurate oscillation frequency without an RC trimming. In a multi-frequency oscillator, an oscillation block(20) outputs a plurality of oscillation signals having different frequency one another in response to a selection signal(SEL). An RC circuit is connected with the oscillation block(20). The RC circuit includes a plurality of resistances(R1,R22 to Rnn) connected in series one another, a plurality of capacitors(C1,C22 to Cnn) connected in parallel one another, and a plurality of switches(SW1,SW2 to SWn) selecting the number of resistances(R1,R22 to Rnn) and capacitors(C1,C22 to Cnn) corresponding to the selection signal(SEL).

Description

다중 주파수 발진기{MULTI-FREQUENCY OSCILLATOR}Multi-Frequency Oscillators {MULTI-FREQUENCY OSCILLATOR}

도 1은 종래기술에 따른 다중 주파수 발진기의 회로도.1 is a circuit diagram of a multi-frequency oscillator according to the prior art.

도 2는 본 발명의 일 실시예에 따른 다중 주파수 발진기의 회로도.2 is a circuit diagram of a multi-frequency oscillator according to an embodiment of the present invention.

* 도면의 주요 부분에 대한 부호의 설명* Explanation of symbols for the main parts of the drawings

10, 20: 발진기 블럭10, 20: oscillator block

SEL<1:n>: 선택신호 SEL <1: n>: Selection signal

본 발명은 집적회로 설계기술에 관한 것으로, 특히 다중 주파수 발진기에 관한 것이다.TECHNICAL FIELD The present invention relates to integrated circuit design technology, and more particularly, to a multi-frequency oscillator.

집적회로 내에서 특정 주파수의 신호를 생성할 때 발진기 회로를 사용하고 있다.Oscillator circuits are used to generate signals of specific frequencies within integrated circuits.

한편, 집적회로가 하나의 주파수의 신호가 아닌 복수의 주파수 신호를 필요 로 하는 회로를 구비하는 경우가 종종 있으며, 이를 위해 다수의 발진 주파수 신호를 출력할 수 있는 다중 주파수 발진기가 사용되고 있다.On the other hand, an integrated circuit is often provided with a circuit that requires a plurality of frequency signals instead of a signal of one frequency, for this purpose, a multi-frequency oscillator capable of outputting a plurality of oscillation frequency signals is used.

도 1은 종래기술에 따른 다중 주파수 발진기의 회로도이다.1 is a circuit diagram of a multi-frequency oscillator according to the prior art.

도 1을 참조하면, 종래기술에 따른 다중 주파수 발진기는, 선택신호 SEL<1:n>에 응답하여 n개의 서로 다른 주파수를 가지는 발진신호를 출력하기 위한 발진기 블럭(10)과, 발진 주파수를 결정하기 위한 RC 회로를 구비한다.Referring to FIG. 1, the multi-frequency oscillator according to the related art determines an oscillator block 10 for outputting an oscillation signal having n different frequencies in response to the selection signals SEL <1: n> and an oscillation frequency. An RC circuit for carrying out is provided.

RC 회로는 각각 서로 다른 RC값을 가지는 n가지의 RC 조합으로 구성되며, 그의 선택은 선택신호 SEL<1:n>에 의해 제어 받는 각각의 스위치(SW1, SW2, …, SWn)에 의해 이루어진다.The RC circuit is composed of n RC combinations each having different RC values, the selection of which is made by respective switches SW1, SW2, ..., SWn controlled by the selection signals SEL <1: n>.

선택신호 SEL<1>에 의해 턴온되는 스위치(SW1)에는 그 일측이 접지전압단에 접속된 캐패시터 C1과 그 일측이 전원전압단(VDD)에 접속된 저항 R1이 연결되며, 다른 RC 조합 역시 이와 마찬가지로 구성된다.The switch SW1 turned on by the selection signal SEL <1> is connected to a capacitor C1 having one side connected to the ground voltage terminal and a resistor R1 connected at one side thereof to the power supply voltage terminal VDD. Similarly configured.

즉, 선택신호 SEL<1>에 의해 스위치 SW1이 턴온되어 R1C1을 사용하여 발진을 하여 주파수 신호 freq1이 출력단(out)으로 출력되고, 선택신호 SEL<2>에 의해 스위치 SW2가 턴온되어 R2C2를 사용하여 발진을 하여 주파수 신호 freq2이 출력단(out)으로 출력되고, 선택신호 SEL<n>에 의해 스위치 SWn이 턴온되어 RnCn을 사용하여 발진을 하여 주파수 신호 freqn이 출력단(out)으로 출력된다.That is, the switch SW1 is turned on by the selection signal SEL <1> to oscillate using R1C1, and the frequency signal freq1 is output to the output terminal, and the switch SW2 is turned on by the selection signal SEL <2> to use R2C2. By oscillation, the frequency signal freq2 is output to the output terminal (out), the switch SWn is turned on by the selection signal SEL <n>, and oscillation is performed using RnCn to output the frequency signal freqn to the output terminal (out).

따라서, 종래의 다중 주파수 발진기는 서로 다른 값을 가지는 n개의 저항(C1이 가장 작고 Cn이 가장 큼)과 n개의 캐패시터(C1이 가장 작고 Cn이 가장 큼)를 필요로 하는데, 저항과 캐패시터가 큰 면적을 차지하는 문제가 있으며, 또한 원하는 주파수의 발진 신호를 얻지 못하는 경우 RC값을 각각 재설정(RC trimming)해 줘야 하는 부담이 따른다.Thus, a conventional multi-frequency oscillator requires n resistors (smallest C1 and largest Cn) and n capacitors (smallest C1 and largest Cn) with different values, with large resistance and capacitor There is a problem of occupying an area, and if the oscillation signal of the desired frequency is not obtained, the burden of RC trimming is applied.

본 발명은 상기와 같은 종래기술의 문제점을 해결하기 위하여 제안된 것으로, 저항 및 캐패시터에 의한 면적을 줄일 수 있고 RC 트리밍이 불필요한 다중 주파수 발진기를 제공하는데 그 목적이 있다.The present invention has been proposed to solve the above problems of the prior art, and an object of the present invention is to provide a multi-frequency oscillator capable of reducing the area caused by a resistor and a capacitor and requiring no RC trimming.

상기의 기술적 과제를 달성하기 위한 본 발명의 일 측면에 따르면, 선택신호에 응답하여 서로 다른 주파수를 가지는 다수의 발진신호를 출력하기 위한 발진기 블럭과, 상기 발진기 블럭에 접속된 RC 회로를 구비하며, 상기 RC 회로는, 서로 직렬로 연결된 다수의 저항과, 서로 병렬로 연결된 다수의 캐패시터와, 상기 선택신호에 대응하는 수의 저항과 캐패시터를 선택하기 위한 다수의 스위치를 구비하는 다중 주파수 발진기가 제공된다.According to an aspect of the present invention for achieving the above technical problem, an oscillator block for outputting a plurality of oscillation signals having different frequencies in response to a selection signal, and an RC circuit connected to the oscillator block, The RC circuit is provided with a multi-frequency oscillator having a plurality of resistors connected in series with each other, a plurality of capacitors connected in parallel with each other, and a plurality of switches for selecting a number of resistors and capacitors corresponding to the selection signal. .

이하, 본 발명이 속한 기술분야에서 통상의 지식을 가진 자가 본 발명을 보다 용이하게 실시할 수 있도록 하기 위하여 본 발명의 바람직한 실시예를 소개하기로 한다.Hereinafter, preferred embodiments of the present invention will be introduced in order to enable those skilled in the art to more easily carry out the present invention.

도 2는 본 발명의 일 실시예에 따른 다중 주파수 발진기의 회로도이다.2 is a circuit diagram of a multi-frequency oscillator according to an embodiment of the present invention.

도 2를 참조하면, 본 실시예에 따른 다중 주파수 발진기는, 선택신호 SEL<1:n>에 응답하여 n개의 서로 다른 주파수를 가지는 발진신호를 출력하기 위한 발진기 블럭(20)과, 발진 주파수를 결정하기 위한 RC 회로를 구비한다.Referring to FIG. 2, the multi-frequency oscillator according to the present embodiment includes an oscillator block 20 for outputting oscillation signals having n different frequencies in response to the selection signals SEL <1: n>, and oscillation frequencies. RC circuitry for determining is provided.

본 발명에서는 발진기 블럭(20)은 변경하지 않고, RC 회로만을 변경하였다.In the present invention, the oscillator block 20 is not changed, only the RC circuit is changed.

본 실시예에 따른 RC 회로는, 서로 직렬로 연결된 n개의 저항(R1, R22, …, Rnn)과, 서로 병렬로 연결된 n개의 캐패시터(C1, C22, …, Cnn)와, 선택신호 SEL<1:n>에 대응하는 수의 저항과 캐패시터를 선택하기 위한 다수의 스위치(SW1, SW2, …, SWn)를 구비한다.The RC circuit according to the present embodiment includes n resistors R1, R22, ..., Rnn connected in series with each other, n capacitors C1, C22, ..., Cnn connected in parallel with each other, and a selection signal SEL <1. A plurality of switches SW1, SW2, ..., SWn for selecting a number of resistors and capacitors corresponding to: n> are provided.

여기서, R1 + R22 + … + Rnn이 상기 도 1의 Rn값과 동일하다고 보면 되고, C1 + C22 + … + Cnn 역시 상기 도 1의 Cn값과 동일하다고 보면 된다.Where R1 + R22 +... It may be assumed that + Rnn is equal to the Rn value in FIG. 1 described above, and C1 + C22 +. + Cnn can also be regarded as the same as the Cn value of FIG.

예컨대, 발진 주파수 freq3을 타겟으로 하는 경우, 스위치 SW3이 턴온되고 이에 따라 R1 + R22 + R33(상기 도 1의 R3와 동일한 저항값)의 R 성분과, C1 + C22 + C33(상기 도 1의 C3와 동일한 캐패시터값)의 C 성분이 선택되어 발진하게 된다.For example, when the oscillation frequency freq3 is targeted, the switch SW3 is turned on and thus the R component of R1 + R22 + R33 (the same resistance value as R3 in FIG. 1), and C1 + C22 + C33 (C3 in FIG. 1 above). The C component of the same capacitor value as is selected and oscillated.

이와 같이 다중 주파수를 구현하는 경우, 상기 도 1의 종래기술에 비해 R1 + R22 + … + Rn-1의 저항 면적과 C1 + C22 + … + Cn-1의 캐패시터 면적을 줄일 수 있게 된다. 또한, 집적회로의 면적 증가에 대한 부담이 없기 때문에 선택신호 SEL의 비트수(n)를 늘리고 RC 회로의 값을 좀더 세분화하더라도 별도의 RC 트리밍 없이도 원하는 발진 주파수를 얻을 수 있다.As such, when implementing multiple frequencies, R1 + R22 +... + Resistance area of Rn-1 and C1 + C22 +. It is possible to reduce the capacitor area of Cn-1. In addition, since there is no burden of increasing the area of the integrated circuit, even if the number of bits n of the selection signal SEL is increased and the value of the RC circuit is further subdivided, a desired oscillation frequency can be obtained without additional RC trimming.

본 발명의 기술 사상은 상기 바람직한 실시예에 따라 구체적으로 기술되었으 나, 상기한 실시예는 그 설명을 위한 것이며 그 제한을 위한 것이 아님을 주의하여야 한다. 또한, 본 발명의 기술 분야의 통상의 전문가라면 본 발명의 기술 사상의 범위 내에서 다양한 실시예가 가능함을 이해할 수 있을 것이다.Although the technical spirit of the present invention has been described in detail according to the above preferred embodiment, it should be noted that the above-described embodiment is for the purpose of description and not of limitation. In addition, those skilled in the art will understand that various embodiments are possible within the scope of the technical idea of the present invention.

예컨대, 전술한 실시예에서는 각각의 발진 주파수에 대응하는 서로 다른 RC값을 구현하기 위하여 저항과 캐패시터를 사용하는 경우를 일례로 들어 설명하였으나, RC를 LC 또는 L로 대체하거나 이들을 혼합 적용하는 경우에도 본 발명은 적용된다.For example, in the above-described embodiment, a case where a resistor and a capacitor are used to implement different RC values corresponding to respective oscillation frequencies has been described as an example. However, even when RC is replaced with LC or L, or a combination thereof is used. The present invention applies.

전술한 본 발명은 집적회로의 면적을 줄이는 효과가 있으며, RC 트리밍 없이도 정확한 발진 주파수를 확보할 수 있는 효과가 있다.The present invention has the effect of reducing the area of the integrated circuit, it is possible to secure the accurate oscillation frequency without RC trimming.

Claims (1)

선택신호에 응답하여 서로 다른 주파수를 가지는 다수의 발진신호를 출력하기 위한 발진기 블럭과,An oscillator block for outputting a plurality of oscillation signals having different frequencies in response to the selection signal; 상기 발진기 블럭에 접속된 RC 회로를 구비하며,An RC circuit connected to said oscillator block, 상기 RC 회로는,The RC circuit, 서로 직렬로 연결된 다수의 저항과,Multiple resistors in series with each other, 서로 병렬로 연결된 다수의 캐패시터와,Multiple capacitors connected in parallel with each other, 상기 선택신호에 대응하는 수의 저항과 캐패시터를 선택하기 위한 다수의 스위치를 구비하는 다중 주파수 발진기.And a plurality of switches for selecting a number of resistors and capacitors corresponding to the selection signal.
KR1020050080939A 2005-08-31 2005-08-31 Multi-frequency oscillator KR101072991B1 (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8040196B2 (en) 2008-10-09 2011-10-18 Samsung Electronics Co., Ltd. Digitally controlled oscillator
CN105654127A (en) * 2015-12-30 2016-06-08 成都数联铭品科技有限公司 End-to-end-based picture character sequence continuous recognition method
CN109709999A (en) * 2018-12-27 2019-05-03 普冉半导体（上海）有限公司 Control the implementation method and circuit of output frequency temperature coefficient

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8040196B2 (en) 2008-10-09 2011-10-18 Samsung Electronics Co., Ltd. Digitally controlled oscillator
CN105654127A (en) * 2015-12-30 2016-06-08 成都数联铭品科技有限公司 End-to-end-based picture character sequence continuous recognition method
CN109709999A (en) * 2018-12-27 2019-05-03 普冉半导体（上海）有限公司 Control the implementation method and circuit of output frequency temperature coefficient
CN109709999B (en) * 2018-12-27 2020-12-01 普冉半导体(上海)股份有限公司 Method and circuit for controlling temperature coefficient of output frequency

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