Abstract:
PROBLEM TO BE SOLVED: To provide a system for controlling the frequency of the output signal of a controllable oscillator (202) in a frequency synthesizer (200). SOLUTION: One such system comprises a controllable oscillator (202) and a frequency control circuit (208). The controllable oscillator (202) is configured to generate an output signal that has a predetermined frequency. The controllable oscillator (202) is also configured with a plurality of operational states that are controlled by the frequency control circuit (208). Each operational state of the controllable oscillator (202) defines a distinct frequency for the output signal of the controllable oscillator (202). The frequency control circuit (208) receives the output signal of the controllable oscillator (202) and determines the distinct frequency for the output signal that best approximates the predetermined frequency. The frequency control circuit (208) may also provide a control signal to the controllable oscillator (202) that is configured to change the controllable oscillator (202) to the operational state corresponding to the distinct frequency that best approximates the predetermined frequency. COPYRIGHT: (C)2008,JPO&INPIT
Abstract:
The present invention relates to a crystal oscillator comprising: an oscillation part outputting an oscillating signal; an operating part operating the oscillation part; a mode transformation part forming a waveform of the oscillating signal; a current supply part applying an operating signal to the mode transformation part; and a control part applying a controlling signal at least one among the oscillation part and the current supply part based on the output of the mode transformation. [Reference numerals] (200) Operating part; (300) Waveform transformation part; (410) Reference current generating part; (420) Current mirror part(500 nA or less); (500) Control part
Abstract:
본 발명은 주파수 합성기(200) 내의 제어 가능한 발진기(202)의 출력 신호의 주파수를 제어하는 시스템을 제공한다. 상기 시스템은 제어 가능한 발진기(202) 및 주파수 제어 회로(208)를 포함한다. 제어 가능한 발진기(202)는 소정의 주파수를 갖는 출력 신호를 생성하도록 구성되어 있다. 제어 가능한 발진기(202)는 또한 주파수 제어 회로가 제어하는 복수의 동작 상태를 갖도록 구성되어 있다. 제어 가능한 발진기(202)의 각 동작 상태는 제어 가능한 발진기(202)의 출력 신호에 대한 별개의 주파수를 정의한다. 주파수 제어 회로는 제어 가능한 발진기의 출력 신호를 수신하여 상기 소정의 주파수에 가장 가까운 상기 출력 신호에 대한 별개의 주파수를 판정한다. 주파수 제어 회로는 또한 제어 가능한 발진기를 상기 소정의 주파수에 가장 가까운 상기 별개의 주파수에 대응하는 동작 상태로 변화시키도록 구성된 제어 신호를 제어 가능한 발진기에 공급할 수 있다.
Abstract:
An oscillator circuit includes: an arithmetic section configured to correct a first input code value and thereby generate a first code value that is within a first predetermined range, the arithmetic section being configured to correct a second input code value in correspondence with a correction amount of the first input code value and thereby generate a second code value, and the first predetermined range being narrower than a range of the first input code value; and an oscillation section configured to generate an oscillation signal having a frequency that varies at first sensitivity based on the first code value and varies at second sensitivity based on the second code value, the second sensitivity being higher than the first sensitivity.
Abstract:
An injection locking oscillator (ILO) comprising a tank circuit having a digitally controlled capacitor bank, a cross-coupled differential transistor pair coupled to the tank circuit, at least one signal injection node, and at least one output node configured to provide an injection locked output signal; a digitally controlled injection-ratio circuit having an injection output coupled to the at least one signal injection node, configured to accept an input signal and to generate an adjustable injection signal applied to the at least one injection node; and, an ILO controller connected to the capacitor bank and the injection-ratio circuit configured to apply a control signal to the capacitor bank to adjust a resonant frequency of the tank circuit and to apply a control signal to the injection-ratio circuit to adjust a signal injection ratio.
Abstract:
An injection locking oscillator (ILO) comprising a tank circuit having a digitally controlled capacitor bank, a cross-coupled differential transistor pair coupled to the tank circuit, at least one signal injection node, and at least one output node configured to provide an injection locked output signal; a digitally controlled injection-ratio circuit having an injection output coupled to the at least one signal injection node, configured to accept an input signal and to generate an adjustable injection signal applied to the at least one injection node; and, an ILO controller connected to the capacitor bank and the injection-ratio circuit configured to apply a control signal to the capacitor bank to adjust a resonant frequency of the tank circuit and to apply a control signal to the injection-ratio circuit to adjust a signal injection ratio.