Abstract:
본 발명의 실시예에 따른 온-오프 변조 수신 장치는 퀀치 파형을 가진 바이어스 전류에 의해 구동되어 RF 신호를 입력받아 발진하여 발진 신호를 출력하는 전압 제어 발진기, 발진 신호의 포락선을 검출하는 포락선 검출기, 포락선을 소정의 판정 기준 전압에 비교하여 복조 심볼을 생성하는 비교기 및 퀀치 파형을 가진 바이어스 전류를 생성하는 퀀치 파형 생성 장치를 포함할 수 있다. 퀀치 파형 생성 장치는 서로 다른 심볼들로 구성된 제1 훈련 심볼 시퀀스에 의해 생성되는 포락선의 상대적으로 큰 피크 크기와 상대적으로 작은 피크 크기의 피크 평균과 제1 기준 전압 사이의 차이를 최소화하는 대략적 임계 전류를 결정하고, 대략적 보정이 완료된 후에, 심볼 "0"으로 구성된 제2 훈련 심볼 시퀀스에 의해 생성되는 포락선의 피크 크기와 제2 기준 전압 또는 접지 전압 레벨 사이의 차이를 최소화하는 미세 임계 전류를 결정하며, 대략적 임계 전류 및 미세 임계 전류를 결합하여 보정된 임계 전류에 기초하여 퀀치 파형을 가진 바이어스 전류를 생성할 수 있다.
Abstract:
A coil driving device for a transmitter coil of an inductive search sensor system according to embodiments of the present invention includes a reference frequency oscillator that generates an oscillation signal which oscillates at a predetermined reference frequency; a free driver terminal that includes a first driving unit and a second driving unit which are activated by a driving activation signal, are operated to complement each other by the oscillation signal, and output a first driving voltage and a second driving voltage which are complementary to each other; a main driver terminal that is swung within a power supply swing range, has a pull-up driving unit and a pull-down driving unit which are operated to complement each other by the first driving voltage and the second driving voltage, and provides a driving current having a frequency corresponding to the oscillation signal for the transmitter coil which is electrically connected to a contact point between the pull-up driving unit and the pull-down driving unit; and a rise edge slew adjusting unit that is activated or deactivated by a slew rate compensation activation signal which is activated in a case where slew rate compensation is required for the transmitter coil, the driving activation signal, and the oscillation signal and is synchronized with a change in the first driving voltage of the first driving unit of the free driver terminal during the activation so as to accelerate the change in the first driving voltage.
Abstract:
A frequency generating apparatus including a charge pump and a loop filter, which is an open loop charge pump bias adjusting device for compensating a charge pump, according to embodiments of the present invention includes a pull-up bias voltage generating unit which generates a pull-up bias voltage and provides the pull-up bias voltage for a charge pump; an integrator which obtains an integral voltage by integrating the output voltage of a loop filter generated by the current of a pull-up charge pump flowing in the loop filter during a pull-up section where the charge pump generates the pull-up charge pump current by using the pull-up bias voltage; n number of comparators which output the result of a comparison between a sampled integral voltage and n number of reference voltages as a comparison signal of n bits when the pull-up section ends; a register of n bits which stores the comparison signal of n bits and outputs the comparison signal as a charge pump compensation signal of n bits; and a pull-down bias voltage generating unit which generates a pull-down bias voltage determined by the charge pump compensation signal and provides the pull-down bias voltage for the charge pump. [Reference numerals] (14) Frequency divider; (50) Charge pump bias adjusting unit; (AA) Bandwidth adjustment control unit; (BB) Test voltage generating unit; (CC) Automatic device compensating unit