Abstract: A radio frequency voltage controlled oscillator (RF VCO) includes a differential oscillator including two field effect transistors (FETs) in which an electric current flows laterally to a substrate and a current source including a bipolar transistor in which the electric current flows in a direction either perpendicular or lateral to the substrate from an emitter to a collector via a base. Therefore, 1/f noise is very small. Resultantly, the RF VCO using the bipolar junction transistor as the current source reduces the 1/f noise generated by the current source of a RF CMOS VCO and, ultimately, the phase noise of the VCO.

Abstract: In a structure of a radio frequency (RF) variable capacitor having a variable range of capacitance between a first minimum value and a first maximum value, and a method of manufacturing the structure, the structure includes a first capacitor, which has a variable range of capacitance between a second minimum value greater than the first minimum value and a second maximum value greater than the first maximum value, and a second capacitor, which is connected in series to the first capacitor and has a capacitance of a fixed value. By the structure and method, a quality factor of a radio frequency (RF) variable capacitor may be increased without adding complex processing steps.

Abstract: In a structure of a radio frequency (RF) variable capacitor having a variable range of capacitance between a first minimum value and a first maximum value, and a method of manufacturing the structure, the structure includes a first capacitor, which has a variable range of capacitance between a second minimum value greater than the first minimum value and a second maximum value greater than the first maximum value, and a second capacitor, which is connected in series to the first capacitor and has a capacitance of a fixed value. By the structure and method, a quality factor of a radio frequency (RF) variable capacitor may be increased without adding complex processing steps.

Abstract: A data slicer and an RF receiver employing the data slicer. The RF receiver includes a demodulator for demodulating a received RF signal, a sample signal output portion for outputting a first sample signal by sequentially outputting samples of the demodulated signal that are sampled according to a predetermined sampling frequency, and outputting a second sample signal which is sampled at a predetermined time delayed from the first sample signal, and a data recovery portion for recovering the demodulated input signals into a DC offset component-deleted data, by using the first and the second sample signals that are output from the sample signal output portion, respectively. Since digitalized data in a pulse waveform is obtained from a DC-deleted signal, a signal recovery efficiency is improved.