Ren-Chieh
Ren-Chieh Liu, Chonghua County TW
Patent application number | Description | Published |
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20090267676 | MULTI-INPUT MIXER, MIXER DEVICE, AND MIXING METHOD - A mixer device includes a differential circuit, a transconductance circuit, and a selecting circuit. The differential circuit receives a differential input signal and generates a differential output signal. The transconductance circuit is coupled to the differential circuit, receives a plurality of radio frequency input signals, and determines to mix at least one of the radio frequency input signals with the differential input signal according to an enable signal. The selecting circuit receives a control signal and generates the enable signal according to the control signal. | 10-29-2009 |
Ren-Chieh Liu, Chang-Hua Hsien TW
Patent application number | Description | Published |
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20090108947 | Voltage Controlled Oscillator - A voltage controlled oscillator includes an LC-tank circuit, a cross-coupled pair circuit, and a trans-conductance adjusting circuit. The LC-tank circuit provides an inductance and a capacitance. The cross-coupled pair circuit is coupled to the LC-tank circuit and has a first transistor and a second transistor in a cross-coupled manner. The trans-conductance adjusting circuit is utilized for adjusting a trans-conductance value of the voltage controlled oscillator according to a first control signal, which includes a third transistor coupled to the first transistor and a first switch unit, and a forth transistor coupled to the second transistor and the first switch unit. The first control signal is used for controlling whether to turn on the first switch unit so as to adjust the trans-conductance value of the voltage controlled oscillator. | 04-30-2009 |
Ren-Chieh Liu, Shetou Township TW
Patent application number | Description | Published |
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20090066393 | SWITCH CIRCUIT - A switch circuit includes a pair of metal oxide semiconductor (MOS) switches and an adjusting unit. Each of the MOS switches has an input terminal and an output terminal. The MOS switches receive a pair of differential input voltages at the input terminals thereof, and output a pair of differential output voltages at the output terminals thereof when the MOS switches conduct. The adjusting unit changes a difference between common mode levels of the input terminals and the output terminals of the MOS switches so as to adjust linearity of differential mode resistances of the MOS switches. | 03-12-2009 |