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				| 1. | The maximum dc output voltage in digital phase detector occurs | 
| A. | When the phase difference is π/2 | 
| B. | When the phase difference is π | 
| C. | When the phase difference is 3π/4 | 
| D. | When the phase difference is 2π | 
| Answer» C. When the phase difference is 3‚âà√¨‚àö√ë/4 | |