公开(公告)号：US20050062855A1

公开(公告)日：2005-03-24

申请号：US10918359

申请日：2004-08-16

申请人： Kuniyuki Tani ,  Atsushi Wada

发明人： Kuniyuki Tani ,  Atsushi Wada

IPC分类号： H03M1/10 ,  H04N1/028 ,  H04N5/16 ,  H04N5/225 ,  H04N5/228 ,  H04N5/235 ,  H04N5/335 ,  H04N5/361 ,  H04N5/369 ,  H04N5/372

CPC分类号： H04N5/165 ,  H04N5/361 ,  H04N5/378

摘要： A signal adjustment circuit which aims to simplify measurement of a component to be adjusted and to improve precision of adjustment. An analog front-end circuit of an imaging device corresponds to a signal processing circuit. By feeding back a black-level signal that is the component to be adjusted, the black-level signal is removed from an imaging signal. A black-level adjustment circuit includes a bypass circuit for allowing the black-level signal to be fed back to bypass a PGA that is a variable gain amplifier. When a black level is measured, the black-level signal passes through the bypass circuit. Thus, setting of a gain does not affect on the black-level signal. An offset component of the PGA has no adverse effect on the measurement of the black level. Moreover, a structure may be provided that inputs a reference voltage to an AD converter and detects and cancels an offset component of the AD converter. Furthermore, a similar structure may be also provided for the PGA.

摘要翻译： 一种信号调整电路，其目的是简化要调整的部件的测量并提高调整精度。 成像装置的模拟前端电路对应于信号处理电路。 通过反馈作为要调整的分量的黑电平信号，从成像信号中去除黑电平信号。 黑电平调整电路包括用于允许反馈黑电平信号旁路作为可变增益放大器的PGA的旁路电路。 当测量黑电平时，黑电平信号通过旁路电路。 因此，增益的设置不会影响黑电平信号。 PGA的偏移分量对黑色电平的测量没有不利影响。 此外，可以提供将参考电压输入到AD转换器的结构，并且检测和消除AD转换器的偏移分量。 此外，也可以为PGA提供类似的结构。

公开(公告)号：US06538246B2

公开(公告)日：2003-03-25

申请号：US10137427

申请日：2002-05-03

申请人： Atsushi Wada ,  Takeshi Otsuka ,  Kuniyuki Tani

发明人： Atsushi Wada ,  Takeshi Otsuka ,  Kuniyuki Tani

IPC分类号： H01J4014

CPC分类号： G06G7/28 ,  H03G1/0088

摘要： Eight resistors having resistance values of R×2i (i=0 to 7) (&OHgr;) are serially connected while eight switches exhibiting parasitic resistance values of r×2i (&OHgr;) in ON states are connected in parallel with the resistors respectively, for changing a resistance value by turning on/off the switches. The resistors are connected between an inversion input terminal of an operational amplifier and a terminal, and a non-inversion input terminal receives a prescribed reference voltage. Between the inversion input terminal and an output terminal of the operational amplifier, a resistor and a switch of a variable resistance circuit forming a negative feedback loop are connected to the output terminal while another resistor and another switch are connected to the inversion input terminal. In the variable resistance circuit, the resistance values of the resistors are successively increased from the side of the terminal, so that the resistor connected to the inversion input terminal has the maximum resistance value. Thus, only a single node is present ahead of the last resistor while a parasitic capacitance is minimized, whereby the frequency characteristic of an operational amplification circuit can be improved.

公开(公告)号：US06437723B1

公开(公告)日：2002-08-20

申请号：US09665678

申请日：2000-09-20

申请人： Takeshi Otsuka ,  Kuniyuki Tani ,  Atsushi Wada

发明人： Takeshi Otsuka ,  Kuniyuki Tani ,  Atsushi Wada

IPC分类号： H03M100

CPC分类号： G11B7/005

摘要： A comparator converts an input analog RF signal to a digital signal and inputs the digital signal in a charge pump circuit. The charge pump circuit controls charging/discharging of an integration capacitor in response to the output level of the digital signal output from the comparator. The charging quantity of the integration capacitor is used as a reference voltage of an RF amplifier, and a center voltage level of the analog RF signal output from the RF amplifier is adjusted in response to an average dc level of the digital signal. Thus, it follows that a slice level of a signal reproducing circuit is properly controlled.

摘要翻译： 比较器将输入的模拟RF信号转换为数字信号，并在电荷泵电路中输入数字信号。 电荷泵电路响应于从比较器输出的数字信号的输出电平来控制积分电容器的充电/放电。 积分电容器的充电量用作RF放大器的参考电压，并且响应于数字信号的平均直流电平来调节从RF放大器输出的模拟RF信号的中心电压电平。 因此，可以适当地控制信号再现电路的限幅电平。