| 摘要 |
A voltage to frequency converter including a first selector (SW3,SW4) for receiving an input voltage and for generating an input current based on the control signal (Sc). The input current is proportional to the input voltage or an inverse polarity input voltage when the control signal designates plus, or minus integration period, respectively. The converter further includes a second selector (SW2,SW1) for generating a reference current such that the reference current is on/off controlled based on the selection signal and a polarity of the reference current is determined by the control signal (Sb), and an integrator (1) for integrating a resultant current of the input current and the reference current to obtain an integrated voltage. The integrator integrates the resultant current complementarily in a forward or in a reverse direction. The converter also includes a comparator (2) for comparing the integrated voltage and a reference voltage to generate a comparison output signal, a selection signal generator (3A) for generating the selection signal based on the comparison output signal and the control signal, a control signal generator (4) for generating the control signal based on the selection signal, and an output circuit for generating the selection signal as an output signal of the converter having a frequency corresponding to the input voltage. <IMAGE> |
