| 摘要 |
PURPOSE: A clock oscillation control circuit of an infrared seeker is provided to control a gain of a rotary pre-amplifier by using the intensity of a target signal. CONSTITUTION: A square wave oscillation circuit(110) generates an operating frequency according to an external voltage. The first monostable multi-vibrator(120) generates a sampling pulse at a rising edge of the operating frequency, branches a sampling pulse, and outputs branched sampling pulses. The second monostable multi-vibrator(130) generates a reset pulse at the rising edge of the sampling pulse and a pulse of k1 at a falling edge of the sampling pulse. The third monostable multi-vibrator(140) generates a sampling pulse-near zone pulse in response to the reset pulse. The first level controller(150) controls a level of the k1 pulse. A sawtooth wave generator(160) generates a sawtooth wave signal in response to the reset signal. A comparator(170) outputs a comparison signal by comparing the sawtooth wave signal with a DC signal. The fourth monostable multi-vibrator(180) generates a pulse of k2 at the rising edge of the comparison signal. The second level controller(190) controls a level of the k2 pulse.
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