Phase calibration of injection-locked oscillators with half-rate clocks

• Main Authors: FACCHIN STEFANO, GRAVE BENJAMIN
• Format: Patent
• Language: Chinese; English
• Published: 30.04.2024
• Subjects: AUTOMATIC CONTROL, STARTING, SYNCHRONISATION, OR STABILISATIONOF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES; BASIC ELECTRONIC CIRCUITRY; ELECTRICITY; GENERATION OF NOISE BY SUCH CIRCUITS; GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING,BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN ANON-SWITCHING MANNER; PULSE TECHNIQUE

A clock generation circuit has an injection locked oscillator, a frequency multiplier circuit, a low pass filter, and a calibration circuit. The injection-locked oscillator has an input coupled to a half-rate clock signal. The frequency multiplier circuit has an input coupled to an output of the injection-locked oscillator. Each of the low pass filters has an input coupled to one of the outputs of the frequency multiplier circuit. The calibration circuit includes comparison logic that receives outputs of the low pass filters. The calibration circuit has an output coupled to a control input of a source of supply current in the injection-locked oscillator. In one example, the source of the supply current is a current digital-to-analog converter. 一种时钟生成电路具有注入锁定振荡器、倍频器电路、低通滤波器和校准电路。该注入锁定振荡器具有耦合到半速率时钟信号的输入。该倍频器电路具有耦合到该注入锁定振荡器的输出的输入。这些低通滤波器中的每个低通滤波器具有耦合到该倍频器电路的多个输出中的一个输出的输入。该校准电路包括接收这些低通滤波器的输出的比较逻辑。该校准电路具有耦合到该注入锁定振荡器中的供电电流的源的控制输入的输出。在一个示例中，该供电电流的该源是电流数模转换器。