| 摘要 |
1,250,778. A/D converters. WESTERN ELECTRIC CO. Inc. 13 Dec., 1968 [18 Dec., 1967], No. 59314/68. Heading G4H. One stage (Fig. 1) of an analogue/digital converter delivering an output bit on conductor 12 comprises two resistor chains 21, 10a, 23, 10c, 25, 30; 22, 10b, 24, 10d, 31, the resistors 10 being shunted by transistors Q 1 , Q 3 , Q 5 , Q 7 to the bases of which is applied the input analogue signal, the transistors being selectively rendered conductive in dependence on the magnitude of the analogue signal at input 11 to effectively short-circuit resistors 10 so that the voltage at terminal 80 either exceeds or is equal to the voltage at terminal 81 to deliver a "1" or "0" output bit. Several different stages may be simultaneously connected to the input 11 (Fig. 4) each stage generating an output bit in accordance with the threshold level(s) it determines to give a reflected binary coded signal. Alternatively identical stages may be connected by binary weighted attenuators to the input, the stages generating a reflected binary code. (For Figures see next column.) |
