| 摘要 |
A pulse is produced at the output of a detector in response to the zero crossings of an analog electronic signal input up to a predetermined input frequency. When that frequency level is exceeded, an indicator voltage level is produced at the output. The apparatus for producing the output pulses and the indicator voltage level is comprised of complementary field effect transistors, requiring very little power. The input of the device is a bi-polar transistor type differential amplifier, the combination providing a zero crossing detector having a much higher frequency response than such a device comprised entirely of complementary field effect transistors, and requiring less power than such devices comprised of bi-polar transistors.
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