| 摘要 |
PURPOSE:To adjust a zero point of a voltage due to feed-through by providing a polarity inverter in synchronism with a clock signal whose frequency is the same as that of a clock signal of other polarity inverter and whose phase is inverted from that of the clock signal so as to invert the polarity of an output of the multiplier multiplying outputs of the polarity inverters in synchronism with a clock signal whose frequency is a specific multiple of the frequency. CONSTITUTION:An analog input signal Vv is inverted by a polarity inverter 5a in synchronism with a 1st clock f1 and its output is added to one input terminal of the multiplier 1. Other signal Vi is inverted by a polarity inverter 5b in synchronism with a 2nd clock f2 and its output is added to the other input terminal of the multiplier 1. The multiplier 1 multiplies the output of the inverters and provides a product output to a polarity inverter 5c in synchronism with a 3rd clock f3. The clocks f1, f2 have the same frequency and the phases of the clock signals differ from each other by 90 deg. and the clock signal f3 has a frequency higher than the clock signals f1, f2 twice. |
