Electronics and Telecommunications Research Institute

Kwi-Dong Kim

Kyung-Soo Kim

Jong-Kee Kwon

Hee-Bum Jung

Jong-Dae Kim

Seung-Chul Lee

Gyu-Hyun Kim

Jong-Ki Kwon

A multiplying digital to analog converter comprising a digital to analog converter having a plurality of capacitors coupled in parallel, applying first signals to the capacitors during a sampling period, and applying second signals to the capacitors during an amplifying period, and an amplifier including a first amplifier electrically coupled to the digital to analog converter; a second amplifier electrically coupled to the first amplifier; and a first switch electrically coupled between an input end and an output end of the second amplifier, being turned off during a sampling period, and being turned off during an amplifying period.

Multiplying digital to analog converter and multipath pipe line analog to digital converter using the same

There is provided an adaptive loop gain control circuit for a voltage-controlled oscillator (VCO). The adaptive loop gain control circuit for a voltage-controlled oscillator (VCO) includes a detected voltage generating unit which generates a detected voltage signal according to changes in an operating voltage and an operating temperature, and a control circuit unit which outputs an oscillation control current signal according to the detected voltage signal and an input control voltage signal. The adaptive loop gain control circuit for a voltage-controlled oscillator (VCO) compensates for an oscillation control current according to changes in operating voltage and temperature and compensates for the gain of a phase locked loop (PLL) system, thereby ensuring high operating stability in the PLL circuit.

Adaptive loop gain control circuit for voltage controlled oscillator

Growing community of inventors

Daejeon, South Korea

Kwi-Dong Kim