| 摘要 |
<p>A pulse generator (PG) for generating pulses having pulse edges at instants at which a va ying input voltage (VS) is substantially equal to one of at least two threshold values (-DC1, -DC2) produced by a voltage source (UV). The pulse generator (PG) comprises at least two voltage comparison circuits (VG2, VG 1) each having first (T13, T15) and second outputs (T14, T16), first (T2, T6) and second inputs (T3, T7) for receiving two voltages to be compared and third (T1, T5) and fourth inputs (T4, T8) for applying blocking voltages thereto which block the voltage comparison circuits (VG2, VG1) between the first (T2, T6) and the second inputs (T3, T7) and the first (T13, T15) and the second outputs (T14, T16) respectively. The first (T6) or the second input (T3), respectively of each voltage comparison circuit (VG1, VG2) is coupled to an input (VT) of the pulse generator (PG) and the further inputs to the voltage source (UV). The outputs (T13, T14, T15, T16) of the voltage comparison circuits (VG2, VG1) are coupled to each other and to an output (PT) of the pulse generator (PG) via diodes (D1, D2, D5, D3, D4, D6) which are separately biased for each voltage comparison circuit (VG2, VG1).</p> |
