| 摘要 |
PURPOSE:To improve the accuracy of D/A conversion by converting once a binary signal inputted to a bit input terminal group into a PWM wave and then converting it into an analog signal being the state of signal before converted into the binary signal. CONSTITUTION:A pulse width signal generator P is provided with output terminals for the 1st pulse width signal P1 synchronously with a period T and having a minimum pulse width T/2N<-1>, the 2nd pulse width signal P2 synchronous ly with the trailing of the signal P1 and having a pulse width T/2N<-2>, the 3rd pulse width signal P3 synchronously with the trailing of the signal P2 and having a pulse width T/2N<-3>,..., the N-th pulse width signal PN synchronously with the trailing of the (N-1)-th pulse width signal PN-1 and having a maximum pulse width T/2, and generates the 1st...N-th pulse width signals P1...PN. Then the pulse width signal generator P generates pulse width signals with high accuracy by using a flip-flop circuit and a counter circuit.
|
