Electronics and Telecommunications Research Institute

Sun Woo Kong

Hui Dong Lee

Bong Hyuk Park

Seung Hyun Jang

Seok Bong Hyun

Kwang Seon Kim

Myung Don Kim

Cheol Ho Kim

Seung Hun Wang

Moon Sik Lee

Kwang Chun Lee

Jee Hoon Park

A reconfigurable circuit for differential network includes: first circuit which is a two-port differential circuit; first cross-coupled switch circuit connected to first port on one side of the first circuit in parallel; and second circuit connected to second port on the other side of the first cross-coupled switch circuit in series. The first cross-coupled switch circuit includes: first-series switch disposed between and connected to first terminal of the first port and first terminal of the second port in series; second-series switch disposed between and connected to second terminal of the first port and second terminal of the second port in series; first cross-coupled element disposed between and connected to the first terminal of the first port and the second terminal of the second port; and second cross-coupled element disposed between and connected to the second terminal of the first port and the first terminal of the second port.

Reconfigurable circuit for differential network including cross-coupled switch

A differential transmission line having a switch may comprise: a first transmission line comprising a first distribution element having a first impedance; a second transmission line comprising a second distribution element having a second impedance; and a first switch block connected between a first end of the first transmission line and a first end of the second transmission line, wherein the first switch block comprises a first switch connected in series to the first end of the first transmission line, a second switch connected in series to the first end of the second transmission line, a first-cross capacitor connected between a first terminal of the first switch and a second terminal of the second switch, and a second cross-capacitor connected between a first terminal of the second switch and a second terminal of the first switch.

Differential transmission line having high isolation and configuration method thereof

An amplifier may comprise first and second matching networks; first and second transistors; and a transformer including first to third inductors. Also, a gate and a source of the first transistor are connected to the first matching network, one end of the first inductor is connected to a drain of the first transistor, the other end of the first inductor is connected to a source of the second transistor, one end of the second inductor is connected to a gate of the second transistor, the other end of the second inductor is grounded, one end of the third inductor is connected to a drain of the second transistor, and the other end of the third inductor is connected to the second matching network.

Amplifier for reusing current by using transformer and method thereof

High frequency signal amplifier including balun is disclosed. The amplifier comprises an input terminal (V) through which the high frequency signal is input; a balun which is connected to the input terminal and outputs a first differential signal and a second differential signal based on the high frequency signal; a transistor (M) which is connected to the balun and outputs an amplified high frequency signal based on the first differential signal and the second differential signal; an output terminal which is connected to the transistor (M) and through which the amplified high frequency signal is acquired and the amplified high frequency signal is output. Therefore, performance of the amplifier can be enhanced.

High frequency signal amplifier including balun

Disclosed are a method for signal modulation based on pulse density modulation and an apparatus therefore. The method for signal modulation is performed in an apparatus for modulating a signal based on pulse density modulation and includes performing pulse density modulation on an analog signal input to the apparatus through a pulse density modulator of the apparatus, converting a bandwidth of the pulse density modulated signal into a bandwidth required for the apparatus through a correlative encoder of the apparatus, transmitting the bandwidth converted signal to a radio frequency (RF) unit of the apparatus based on an electrical-to-optical (E/O) converter and an optical-to-electrical (O/E) converter of the apparatus, filtering a frequency band of the bandwidth converted signal and outputting the frequency band filtered signal via the RF unit.

Method for signal modulation based on pulse density modulation and apparatus therefor

A matching circuit in a communication apparatus may comprise a first inductor disposed at a primary side of a transformer; a second inductor disposed at a secondary side of the transformer; and an impedance element connected to the first inductor and the second inductor. Also, a first terminal of the first inductor may be connected to an input terminal of the transformer, a second terminal of the first inductor may be connected to a common node connected to a ground, a first terminal of the second inductor may be connected to an output terminal of the transformer, a second terminal of the second inductor may be connected to the common node, a first terminal of the impedance element may be connected to the common node, and a second terminal of the impedance element may be connected to the ground.

Impedance matching circuit of communication apparatus

A data modulation apparatus may comprise a S2D conversion part including a first amplifier operating based on a carrier wave signal and two transformers receiving an output signal of the first amplifier; a first switch part transferring status of input data to the first amplifier based on the input data; a differential amplification part receiving output signals of the S2D conversion part and amplifying the output signals of the S2D conversion part; a D2S conversion part receiving output signals of the differential amplification part and performing modulation on the output signals by converting the output signals to a single signal; and a second switch part transferring the output signals of the differential amplification part to the D2S conversion part based on the input data. Here, the first switch part and the second switch part may be alternately turned on and off.

Growing community of inventors

Daejeon, South Korea

Sun Woo Kong