| 摘要 |
Direct up-conversion of a signal (10) is accomplished using a sampling pulse generator circuit (12, 16, 20, 24) and a gated differential amplifier 26, enabled by the sampling signal (25). When not enabled, the output of the differential amplifier (26) is pulled to zero. The sampling pulse (25) is generated from a base frequency sine wave (10) which is squared with a limiting amplifier (12), and further passed through one or more frequency doublers (16, 20) producing a times two signal (18), a times four signal (22) and so on. The squared base frequency 14 and frequency doubled signals (18, 22) are logically ORed (24) to produce a short duration pulse (25) which repeats at the frequency of the base signal. The resulting output (34) is an amplitude modulated pulse doublet time domain waveform. |
