Sine Wave To TTL Converter


As the title implies,
the present circuit is intended to convert sinusoidal input signals to TTL
output signals. It can handle inputs of more than 100 mV and is
suitable for use at frequencies up to about 80 MHz. Transistor T1,
configured in a common-emitter circuit, is biased by voltage divider
R3–R5 such that the potential across output resistor R1 is about half
the supply voltage. When the circuit is driven by a signal whose
amplitude is between 100 mV and TTL level
(about 2 V r.m.s.), the circuit generates rectangular signals. The
lowest frequencies that could be processed by the prototype were around
100 kHz at an input level of 100 mV, and about 10 kHz when the input
signals were TTL level.

Circuit diagram:

Sine Wave To TTL Converter Circuit

Sine Wave To TTL Converter Circuit Diagram

Resistor R6 holds the input resistance at about 50 Ω, which is the
normal value in measurement techniques. It ensures that the effects of
long coaxial cables on the signal are negligible. If the converter is
used in a circuit with ample limits, R6 may be omitted, whereupon the
input resistance rises to 300 Ω.


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