Industrial Technology Research Institute

Sino Matrix Technology, Inc.

Jeng-Shing Lee

Yee-Lu Zhaog

Chin-Chung Wen

An intermittent oscillation circuit is disclosed, and more particularly, relates to an intermittent oscillation circuit utilized in a RF transmitting/receiving system. The intermittent oscillation circuit of the present invention comprises an inversion circuit, a power control circuit and a power supply circuit. By utilizing the power control circuit to controlling the operation voltage level outputted from the power supply circuit, the duty cycle of oscillatory signal outputted from the inversion circuit can be adjusted. Therefore, data collision is decreased while transmitting/receiving various data in the RF transmitting/receiving system, and the power consumption is decreased at the transmitting/receiving terminal as well.

Intermittent oscillation circuit

A fast switching phase-locked loop that substantially reduces the response time and the noise is disclosed. The present invention includes a voltage-controlled oscillator, which generates an ac output signal whose frequency is proportional to a control signal. A divider is used to generate a division signal whose frequency is an integer division of the ac output signal. The present invention also includes a phase detector, which generates a detect signal proportional to a phase difference of the division signal and a reference signal, therefore making the frequency of the ac output signal be an integer multiple of the reference signal. A first filter is used to shape the overall response during a fore part of switching period by generating the control signal according to the detect signal, and the first filter is then prohibited during a later part of the switching period. A second filter is further used to shape the overall response during the later part of switching period by generating the control signal according to the detect signal, where the bandwidth of the first filter is larger than the bandwidth of the second filter.

Growing community of inventors

Hsinchu, Taiwan

Jeng-Shing Lee