公开(公告)号：US20140120856A1

公开(公告)日：2014-05-01

申请号：US13941546

申请日：2013-07-15

Applicant: Hua-Yu Liao ,  Cheng-Yu Wang ,  Ying-Tang Chang

Inventor： Hua-Yu Liao ,  Cheng-Yu Wang ,  Ying-Tang Chang

IPC: H03G3/30 ,  H03F3/193

CPC classification number: H03F3/193 ,  H03F3/45188

Abstract: A RF front-end circuit and a low noise amplifier thereof configured for a receiver are provided. The circuit includes a low noise amplifier and a quadrature passive mixer. The low noise amplifier provides two RF output differential signals to the quadrature passive mixer. The RF signals are down-converted to the differential in-phase baseband signals and the differential quadrature-phase baseband signals. The structure of the RF front-end circuit can avoid the signal and noise interfering between in-phase channel and quadrature-phase channel without using a 25% duty cycle local oscillation generator circuit.

Abstract translation: 提供了一种用于接收器的RF前端电路及其低噪声放大器。 该电路包括一个低噪声放大器和一个正交无源混频器。 低噪声放大器为正交无源混频器提供两个RF输出差分信号。 RF信号被下变频到差分同相基带信号和差分正交相位基带信号。 RF前端电路的结构可以避免同相信道和正交相位信道之间的信号和噪声干扰，而不使用25％的占空比本地振荡发生器电路。

公开(公告)号：US20090256635A1

公开(公告)日：2009-10-15

申请号：US12102082

申请日：2008-04-14

Applicant: Yan Tong ,  Ying-Tang Chang

Inventor： Yan Tong ,  Ying-Tang Chang

IPC: H03F3/45 ,  H03G3/00

CPC classification number: H03G7/06

Abstract: A variable gain amplifier (VGA) with a gain thereof exponential to a control voltage thereof. The variable gain amplifier (VGA) comprises an exponential DC converter, and a linear voltage multiplier. The exponential DC converter receives the control voltage and generates an exponential voltage which is exponential to the control voltage. The linear voltage multiplier is coupled to the exponential DC converter and has a gain proportional to the exponential voltage of the exponential DC converter.

Abstract translation: 一种可变增益放大器（VGA），其增益指向其控制电压。 可变增益放大器（VGA）包括指数DC转换器和线性电压倍增器。 指数DC转换器接收控制电压并产生指向控制电压指数的指数电压。 线性电压倍增器耦合到指数DC转换器，并且具有与指数DC转换器的指数电压成比例的增益。