Mediatek Corporation

National Taiwan University

Kun-Yin Wang

Ang-Sheng Lin

Wei-Hao Chiu

Shen-Iuan Liu

Chorng-Kuang Wang

Yen-Tso Chen

Hao-Wei Huang

Tao-Yao Chang

An oscillator apparatus includes an oscillator core circuit. The oscillator core circuit includes an inverting transconductance amplifier, at least one first capacitor, at least one second capacitor, and a resonator. The at least one first capacitor is connected between an input of the inverting transconductance amplifier and a ground level. The at least one second capacitor is connected between an output of the inverting transconductance amplifier and the ground level. The resonator has a first port connected to the input of the inverting transconductance amplifier and a second port connected to the output of the inverting transconductance amplifier. The first port is decoupled from the second port.

Oscillator scheme capable of reducing far-out phase noise and closed-in phase noise

An inductor capacitor (LC) tank includes a first inductor and a first tunable capacitive array. The first inductor has a first terminal and a second terminal, and the first tunable capacitive array has a first terminal and a second terminal. The first tunable capacitive array is at a path branching from a first point between the first terminal and the second terminal of the first inductor, the first terminal of the first tunable capacitive array is coupled to the first point, and the second terminal of the first tunable capacitive array and the second terminal of the first inductor are coupled to a reference voltage.

Inductor capacitor tank for resonator

A frequency dividing apparatus includes: a plurality of latching devices arranged to selectively generate an output signal having a first oscillating frequency or a second oscillating frequency different from the first oscillating frequency according to an input clock signal and a first reset signal; and a controlling device arranged to generate the first reset signal at least according to a programming input signal; wherein the first reset signal is arranged to reset a first latching device in the plurality of latching devices to make the plurality of latching devices to generate the output signal having the second oscillating frequency.

Frequency dividing apparatus and related method

A voltage generating circuit comprising: an output current generating circuit, generating an output current, such that an output voltage is generated at an output terminal, according to an output voltage control signal; a comparing device, comprising a first input terminal receiving a reference voltage, a second input terminal receiving a feedback voltage related with the output voltage, and an output terminal outputting the output voltage control signal according to the reference voltage and the feedback voltage; an adjustable voltage dropping circuit, comprising a first terminal coupled to the second input terminal, and a second terminal coupled to the output terminal; and a current source, for generating a predetermined current to the first terminal of the adjustable voltage dropping circuit, thereby the feedback voltage is generated at the first terminal of the adjustable voltage dropping circuit. The predetermined current flows through the adjustable voltage dropping circuit to the output terminal.

Voltage generating circuit and polar transmitter

The signal processing apparatus contains a first signal transforming circuit and a second signal transforming circuit. The first signal transforming circuit includes four first coupled lines and two second coupled lines, wherein two ends of each first coupled line are configured to carry a first pair of differential signals respectively, each second coupled line is magnetically coupled to two of the first coupled lines in parallel and comprises two signal ports, to which the two ends of each of the magnetically-coupled first coupled lines are placed symmetrically for transferring a second pair of differential signals. The second signal transforming circuit is configured to convert between the second pairs of differential signals at the signal ports and a third pair of differential signals at connecting ports of the second signal transforming circuit.

Growing community of inventors

Tainan, Taiwan

Kun-Yin Wang