Samsung Electro-Mechanics Co., Ltd.

Korea Electronics Technology Institute

Hyun Chol Shin

Yeon Kug Moon

Kwang Ho Won

Jun Ki Min

Seung Soo Kim

Jong Sik Kim

Jeong Suk Lee

There is provided a wide-band direct conversion transmitting apparatus including: a local oscillation unit generating first, second, and third oscillation signal pairs each including a pair of signals having a phase difference of 90&#xb0;; an image rejection mixer unit mixing baseband transmission signals including an I signal and a Q signal having a phase difference of 90&#xb0; with the first oscillation signal pair; a harmonic rejection mixer unit mixing each of the first, second, and third oscillation signal pairs with the baseband transmission signals; and an output signal selecting unit selecting output signals from the image rejection mixer unit or from the harmonic rejection mixer unit.

Wide-band direct conversion transmission apparatus

A frequency divider for a wireless communication system is provided. A frequency divider includes a body bias voltage generator and a divider. The body bias voltage generator generates a body bias voltage including a PMOS body bias voltage and an NMOS body bias voltage whose voltage levels are controlled according to an input signal. The divider includes a plurality of flip-flops whose operation points are determined according to the body bias voltage, and generates an output signal by dividing a frequency of the input signal by N. Each of the flip-flops may include a PMOS logic and an NMOS logic. The PMOS logic may include a plurality of PMOS transistors whose operation points are determined according to the PMOS body bias voltage. The NMOS logic may be connected electrically to the PMOS logic and include a plurality of NMOS transistors whose operation points are determined according to the NMOS body bias voltage.

Frequency divider for wireless communication system and driving method thereof

Growing community of inventors

Seoul, South Korea

Hyun Chol Shin