National Taiwan University

Richwave Technology Corp.

Ren-Hong Yen

Sheng-Lyang Jang

Yun-Hsueh Chuang

Shao-Hua Lee

Shao-Hwa Lee

A capacitance adjustment method for enabling or disabling a first set of capacitors to an nset of capacitors of n sets of capacitors, includes generating a base count according to base capacitance, generating a first count to an ncount according to the first set of capacitors to the nset of capacitors respectively, obtaining a first ratio to an nratio according to the base count and the first count to the ncount, indicating a target count, obtaining a target ratio according to the base count and the target count, and obtaining a first control signal to an ncontrol signal according to the target ratio and the first ratio to the nratio so as to enable or disable the first set of capacitors to the nset of capacitors accordingly.

Capacitance adjustment method and capacitance adjustment device

A multi-phase voltage-control oscillator including a first voltage-control oscillator circuit and a second voltage-control oscillator circuit is provided. The second voltage-control oscillator circuit and the first voltage-control oscillator circuit have a plurality of inductors, and the inductors in the second voltage-control oscillator circuit are respectively cross-coupled with the inductors in the first voltage-control oscillator circuit to generate a mutual inductance effect, so as to output a plurality of oscillating signals with different phases.

Multi-phase voltage-control oscillator

An injection-locked frequency divider is provided. The injection-locked frequency divider includes a variable reactance unit, a signal injection unit, a first switch, a second switch, a first transformer, and a second transformer. The variable reactance unit, the first switch, the second switch, the first transformer, and the second transformer form a transformer-based LC-tank oscillator. The signal injection unit receives an injection signal. When the injection-locked frequency divider is in a locked state, the transformer-based LC-tank oscillator outputs a frequency division signal. Employing the feedback action of the first transformer and the second transformer, the present invention not only has a wide locking range but also promotes the realization of the low operating voltage.

Injection-locked frequency divider

A multi-phase voltage-control oscillator including a first voltage-control oscillator circuit and a second voltage-control oscillator circuit is provided. The first voltage-control oscillator circuit includes a first LC tank and a first inductor assembly unit. The second voltage-control oscillator circuit includes a second LC tank and a second inductor assembly unit. A mutual inductance effect is generated between the inductors of the first voltage-control oscillator and the inductors of the second voltage-control oscillator.

Growing community of inventors

Taipei, Taiwan

Ren-Hong Yen