Patent ID: 9264079
Filing Date: 2016-02-16
CPC Classification: H04B

Claim Text:
1. An apparatus for Direct Current (DC) offset calibration in a signal transmission device, the apparatus comprising: a Current-to-Voltage Converter (IVC) for converting a signal, into a voltage signal; a first DC calibration unit for removing a DC offset from a signal, which is output from the IVC, by using a first DC calibration value; a Variable Gain Amplifier (VGA) for amplifying a signal output from the IVC, by using a previously-set gain; a second DC calibration unit for removing a DC offset from a signal, which is output from the VGA, by using a second DC calibration value; a Low Pass Filter (LPF) for filtering a signal output from the VGA in such a manner as to limit a bandwidth of the signal to a previously-set bandwidth; a third DC calibration unit for removing a DC offset from a signal, which is output from the LPF, by using a third DC calibration value; and a controller for determining the first DC calibration value, the second DC calibration value and the third DC calibration value, wherein at least one of the first DC calibration value, the second DC calibration value, and the third DC calibration value is based on a magnitude of an analog baseband input tone.